Chemical Class Standard Operating Procedures

Acutely Toxic Gases (ATG)

Print a copy and insert into your SOP binder. Department: Chemistry

Date SOP was written: June 10, 2013

Date SOP was approved by PI/lab supervisor: Name: Richmond Sarpong Principal Investigator: Signature: ______Name: Paul Leger Internal Lab Safety Coordinator or Lab Manager: Lab Phone: 510-643-2485 Office Phone: 510-642-6312 Name: Richmond Sarpong Emergency Contact: Phone Number: 626-644-2407 Latimer Hall: 834, 836, 837, 838, 839, 842, 847, 849, Location(s) covered by this SOP: 907

1 - Purpose This SOP covers the precautions and safe handling procedures for the use of Acutely Toxic Gases in the Sarpong group, which include the following chemicals and their uses: Chemical(s) Use(s) ATGs 1. Use as a reagent. Carbon monoxide 2. Transferring carbon monoxide to a pressurized reaction vessel. Ammonia 3. Synthesis with gaseous ammonia 4. Condensing ammonia 5. Quenching/Evaporating ammonia

Sarpong inventory chemicals Ammonia covered by this SOP Boron trichloride Carbon Monoxide

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2 - Physical & Chemical Properties/Definition of Chemical Group Before working with any Acutely Toxic Gases, review the UC-Berkeley EH&S publication Toxic Gas Program (2011). http://www.ehs.berkeley.edu/images/ehs/healthsafety/toxicgasprogram.pdf This is a chemical class SOP. Some uses of the chemicals in this class require specific SOPs. Chemical- specific SDSs and all relevant SOPs must be reviewed prior to use of any chemical in this class. It is the Principal Investigator’s responsibility to ensure activity specific laboratory procedures and/or processes are taken into account when using this Chemical Class SOP. This Chemical Class SOP is intended to provide general guidance on how to work safely with acutely toxic gases. If you have questions concerning the applicability of any item listed in this procedure, contact the Principal Investigator/Laboratory Supervisor of your laboratory or EH&S.

3 - Potential Hazards/Toxicity There is a broad spectrum of toxic compressed gases. Increased recognition of the hazards associated with the transportation, operation, and storage of these gases is essential. Toxic gases are gases that may cause significant acute health effects at low concentrations. Health effects may include severe skin or eye irritation, pulmonary edema, neurotoxicity, or other potentially fatal conditions. The Acutely Toxic Gases in the Settlement Agreement are listed in the Appendix. Acutely toxic gases may also have other hazardous properties in addition to acute toxicity. Safe use requires assessing all potential hazards.

4 - Engineering Controls Use the engineering controls listed below unless other lab-specific information is included in the Protocol/Procedure section. Work with acutely toxic gases should be conducted in a unless other controls are designated in the lab-specific Protocol/Procedure section. Sash height should be kept low to avoid escaping fumes and provide a physical barrier. 5 - Personal Protective Equipment For additional information on PPE requirements, go to: http://ccehss.berkeley.edu/section5#Personnel_Protective_Equipment_Required_in_College_Laboratories Use the PPE listed below unless other lab-specific information is included in the Protocol/Procedure section. Eye and Face Protection ANSI-approved safety glasses with side shields or chemical splash goggles must be worn at all times when handling chemicals in the lab. Skin and Body Protection 1. Gloves are required when handling hazardous chemicals. a. Specific glove type recommendations are provided in the Protocol/Procedure section. b. Inspect gloves prior to use. Use proper glove removal technique (without touching glove's outer surface) to avoid skin contact with this product. Wash and dry hands after handling chemicals, before breaks, and at the end of the workday. c. For additional information on glove selection, go to: http://ehs.berkeley.edu/hs/63-laboratory-safety/94-glove-selection-and-usage.html

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2. Lab coats are required when handling hazardous chemicals in the lab. a. Nomex 3A flame-resistant lab coats are required when working with pyrophorics (H250) and explosives (H200, H201, H202, H203) b. Flame resistant lab coats (Nomex or other material) should be worn when working with hazardous chemicals such as Category 1 or 2 flammable liquids (H224 and H225). 3. Cotton-based, non-synthetic clothing (including long pants; no skin exposed below the waist) should be worn. 4. Closed-toe and closed-heel shoes are required in the lab. Respiratory Protection Respiratory protection is normally not required for UC Berkeley laboratory activities. Any lab personnel considering the use of a respirator must contact EH&S for a workplace assessment. Respirator users will be provided with specific instructions if a respirator is deemed necessary by EH&S.

6 - First Aid Procedures and Medical Emergencies Notify supervisor and EH&S immediately. Follow up with a call to 510-642-9090 to report the incident. Life Threatening Emergency, After Hours, Weekends and Holidays – Call 911 or go to the nearest emergency room. Note: All serious injuries must be reported to EH&S within 8 hours. Follow up with a call to 510-642-9090 to report the incident. Assess the extent of danger. If you cannot assess the conditions of the environment well enough to be sure of your own safety, do not enter the area. If possible, help contaminated or injured persons. Obtain medical attention for the individual as soon as possible by calling 911. Provide a copy of the appropriate SDS to the emergency responders or physician, as needed.

If inhaled Move into fresh air. Go to the Occupational Health Facility (Tang Health Center) and after hours, go to the nearest emergency room. If person is not breathing, call 911 and give artificial respiration. If unconscious, call 911.

In case of skin contact Immediately flush with flowing water for no less than 15 minutes; remove any jewelry or clothing as necessary to facilitate clearing of any residual materials. Wash off with soap and plenty of water for 15 minutes. If skin contact requires medical assistance, go to the Occupational Health Facility (Tang Health Center) and after hours, go to the nearest emergency room. If this is a large or serious injury, call 911.

In case of eye contact Rinse thoroughly with plenty of water using an station for at least 15 minutes, occasionally lifting the upper and lower eyelids. Remove contact lenses if possible. Call 911.

If swallowed Call 911. Do not induce vomiting unless directed otherwise by the SDS. Never give anything by mouth to an unconscious person. Rinse mouth with water. Go to the Occupational Health Facility (Tang Health Center) and after hours, go to the nearest emergency room.

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Needle stick/puncture exposure Wash the affected area with antiseptic soap and warm water for 15 minutes. For mucous membrane exposure such as eyes, mouth and/or nose, flush the affected area for 15 minutes using an eyewash station. Go to the Occupational Health Facility (Tang Health Center) and after hours, go to the nearest emergency room. All needle stick/puncture exposures must be reported to EH&S within 8 hours. Follow up with a call to 510-642-9090 to report the incident.

7 - Special Handling and Storage Requirements Lab-specific information on handling and storage may be included in the Protocol/Procedure section. Working alone - Certain extremely hazardous operations should not be performed if the PI or Lab Safety Contact(s) are not present. Never work alone with extremely hazardous materials/operations. See the Protocol/Procedure section below for specific prohibitions (if any) on working alone.

Precautions for safe handling The publication Toxic Gas Program (2011) describes the many requirements applicable to the safe handling and use of acutely toxic gases. Topics included in the publication are definitions, roles/responsibilities, purchase approval process, receiving, storage, fundamental handling requirements, and disposal. http://www.ehs.berkeley.edu/images/ehs/healthsafety/toxicgasprogram.pdf

Conditions for safe storage It is essential that all acutely toxic gases be stored separately from all chemicals with which they may react. Ensure segregation of incompatible chemicals per guidance within EH&S guidelines. Also, follow any substance-specific storage guidance provided in Safety Data Sheet (SDS) documentation. All compressed gas cylinders must be stored with valve cover caps in place. Damage to a valve can cause the cylinder to become a dangerous projectile. Cylinders must be securely restrained to prevent them from falling at all times.

8 - Chemical Release Chemical Release Dial 911  Accidental Release – Help contaminated or injured persons. Evacuate the release area. Avoid breathing vapors. Eliminate sources of ignition. Keep others from entering this area (e.g., use caution tape, barriers, etc.). Notify supervisor and EH&S immediately. Follow up with a call to 510-642-9090  Contact with body or clothes – Remove clothing and rinse body thoroughly in emergency shower for at least 15 minutes. Seek medical attention. Notify supervisor and EH&S immediately. Follow up with a call to 510-642-9090  Contact with Eyes – Immediately rinse eyeballs and inner surface of eyelid with water for 15 minutes using an eyewash station by forcibly holding the eye open. Seek medical attention. Notify supervisor and EH&S immediately. Follow up with a call to 510-642-9090

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9 - Cleaning and Decontamination Lab-specific information on decontamination may be included in the Protocol/Procedure section. All lines or ducts carrying purged or exhausted emissions of gases must be connected to a mechanical exhaust system that discharges to a safe location (i.e., presents no potential for re-entrainment into any building supply air intake or occupied area). Construction of the exhaust ducts must be chemically resistant to degradation by the gas in use. Significant emissions of corrosive or toxic gases require an emission control device (e.g., scrubber, flare device, adsorbent) before the purged gas can be vented into the exhaust duct system. Refer to Toxic Gas Program (2011): http://www.ehs.berkeley.edu/images/ehs/healthsafety/toxicgasprogram.pdf.

10 - Hazardous Waste Disposal Label Waste Label all containers with the label provided at: http://ehs.berkeley.edu/hm/279-new-hazardous-waste-program-hwp.html. See the EH&S Fact Sheet, “Hazardous Waste Management” for general instructions on procedures for disposing of hazardous waste. Dispose of Waste • Dispose of regularly generated chemical waste within 6 months. • Call EH&S with questions.

11 - Safety Data Sheet (SDS) Location SDS can be accessed online at http://ucmsds.com

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12 - Protocol/Procedure – Acutely Toxic Gas (ATG)

Before using any ATG be sure you are in compliance with the University of Berkeley Toixc Gas Program requirements. http://www.ehs.berkeley.edu/images/ehs/healthsafety/toxicgasprogram.pdf Acutely Toxic Gases can have a very broad range of additional hazards including but not limited to strong oxidizers, corrosives, water reactives, strong reducing agents, and flammables. Be sure you understand and take appropriate action to protect yourself and others from all hazards.

Preparation All regulators, valves, and lines must be chemically compatible with the gases being used. Regulators shall be compatible with the size and type of gas cylinder being used and rated for full cylinder pressure.

Know the location of the nearest fire extinguisher, eyewash, and safety shower before beginning work. Indoor storage of all ATG cylinders shall be in a mechanically ventilated, lockable area. All empty gas cylinders shall be Chemical Storage labeled as empty; however, empty cylinders may still contain some toxic gas, so must remain in exhausted enclosures or and Disposal fire code compliant gas storage rooms. Depleted gas cylinders should be returnable to the vendor according to their guidelines Reaction vessels and chambers should be inside exhausted enclosures like fume hoods. Where possible all operations must be conducted in a designated fume hood area with an appropriated warning sign, e.g. Warning! Acutely Toxic Gas in Use: Carbon Monoxide.

Some ATG have poor warning properties. If a particular ATG falls into this category and work with this gas will be done Lab-specific routinely or larger quantities will be employed, consider installing a continuous electronic warning sensor with alarm if Information available. Insure that the fume hood is operating properly and keep the sash as low as possible at all times. A ventilation monitor is required on the hood All lines or ducts carrying purged or exhausted emissions of gases must be connected to a mechanical exhaust system that discharges to a safe location. It may be appropriate to use some form of scrubber to remove any ATG that is vented from the reactor. This will depend upon the specific ATG that is in use.

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Procedure/Use Scale Engineering PPE (eye, face, gloves, clothing) Procedure Steps and Controls/Equipment Precautions 1. Use as a Up to lecture Conduct all operations in Eye protection: Wear ANSI Approved tight- Avoid inhalation of these reagent . Larger a designated fume hood. fitting safety goggles or safety glasses with materials. quantities Blast shields must be side shields. require used if the reaction has Be sure that the delivery compound the potential to generate Face protection: The need for face pressure of the ATG is specific SOP large quantities of gases protection is based on the volume of solvents compatible with the reaction or is strongly exothermic. used or if the reaction will be externally apparatus. Use a compatible heated or if needed. Wear a gas regulator. Insure that the Open flames and when handling containers that are not behind gas being passed through the possible sparking and a lab hood sash or blast shield. reactor is properly vented into static electricity must be the fume hood and that any avoided Gloves: Confirm the compatibility of the vented gases do not constitute Open flames and gloves you use with the specific ATG. At at a a health threat to coworkers or possible sparking and minimum wear 8 mil minimum Nitrile gloves nearby populations. Extreme care should be taken not to over static electricity must be must be used to prevent incidental contact. pressurize glass reactors. avoided. Gloves must be inspected prior to use. Use

proper glove removal technique (without touching glove's outer surface) to avoid skin contact with this product. Remove gloves immediately upon contamination. Wash and dry hands after use.

Clothing: Wear fire/flame resistant lab coat (100% cotton based); cotton based clothing/attire; full length pants or equivalent; and close-toed, close-heeled shoes.

Notes Any deviation from this SOP requires approval from PI.

Rev. Date: June 10, 2013 7 Acutely Toxic Gases Class SOP

Procedure/Use Scale Engineering PPE (eye, face, gloves, clothing) Procedure Steps and Special Precautions Controls/Equipment for this Procedure 2. Transferring The carbon All reactions must be Eye Protection: Wear tight-fitting 1. Ensure carbon monoxide detector is on carbon monoxide performed in a safety goggles or safety glasses and in working order and hood inflow monoxide to a cylinder used properly operating with side shields. velocity is at least 100 fpm. pressurized must fit inside of fume hood. 2. Ensure carbon monoxide tank is reaction vessel. the fume hood. Face Protection: Use a face shield securely fastened with chain clamps or ring A functioning carbon if not protected by the fume hood clamps inside the fume hood. The carbon monoxide detector sash. monoxide tank must be stored and used in must be used. a fume hood at all times. Hand Protection: 8 mil minimum 3. Unscrew cylinder cap. Nitrile gloves must be used to 4. Ensure main valve is completely closed. prevent incidental contact. Gloves 5. Unscrew main valve cap. must be inspected prior to use. 6. Attach an appropriate pressure regulator Cotton or leather gloves may be and connect the hose to the reaction used as well to prevent mechanical vessel. injury. Wash and dry hands after 7. Carefully pressurize reaction vessel to use. ca. 100 psi. 8. Carefully release pressure from reaction Clothing: Wear fire/flame resistant vessel into the fume hood. lab coat (100% cotton based); 9. Repeat steps 7-8 to purge the vessel of cotton based clothing/attire; full air. length pants or equivalent; and 10. Carefully pressurize reaction vessel to close-toed, close-heeled shoes. desired pressure. 11. Ensure reaction vessel is sealed. 12. Remove hose from reaction vessel. 13. Close main valve on tank. 14. Slowly release pressure from regulator into the fume hood. 15. Remove regulator from tank and allow to vent into the fume hood. 16. Secure main valve cap. 17. Secure cylinder cap. Notes Any deviation from this SOP requires approval from PI. Initials of individuals using this procedure

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Procedure/Use Scale Engineering PPE (eye, face, gloves, clothing) Procedure Steps and Special Controls/Equipment Precautions for this Procedure 3. Synthesis The ammonia All reactions must be Eye Protection: Wear tight-fitting 1. Ensure hood inflow velocity is at least with Gaseous cylinder used performed in a properly safety goggles or safety glasses 100 fpm and that the ammonia tank is Ammonia must fit inside of operating fume hood. with side shields. securely fastened with chain clamps or ring clamps inside the fume hood. The the fume hood. If the balloon apparatus Face Protection: Use a face ammonia tank must be stored and used involves a needle, make shield if not protected by the fume in a fume hood at all times. sure the needle is capped hood sash. 2. Affix your balloon apparatus, which during any transport. contains a valve, to end of the tubing Hand Protection: 8 mil minimum from the ammonia tank regulator. Open Nitrile gloves must be used to the valve on the balloon apparatus, and prevent incidental contact. Gloves then open the ammonia valve very must be inspected prior to use. slowly. Once the desired amount is Cotton or leather gloves may be obtained, close the valve on the used as well to prevent ammonia tank, then close the valve on mechanical injury. Wash and dry your balloon apparatus. Evacuate and hands after use. backfill your reaction vessel using the ammonia gas balloon apparatus as Clothing: Wear fire/flame desired. resistant lab coat (100% cotton based); cotton based clothing/attire; full length pants or equivalent; and close-toed, close- heeled shoes.

Notes Any deviation from this SOP requires approval from PI. Initials of individuals using this procedure

Rev. Date: June 10, 2013 9 Acutely Toxic Gases Class SOP

Procedure/Use Scale Engineering PPE (eye, face, gloves, Procedure Steps and Special Precautions Controls/Equipment clothing) for this Procedure 4. Condensing The ammonia All reactions must be Eye Protection: Wear tight- 1. Ensure hood inflow velocity is at least 100 Ammonia cylinder used performed in a properly fitting safety goggles or safety fpm and that the ammonia tank is securely must fit inside of operating fume hood. glasses with side shields. fastened with chain clamps or ring clamps the fume hood. inside the fume hood. The ammonia tank If the balloon apparatus Face Protection: Use a face must be stored and used in a fume hood at This procedure is involves a needle, make shield if not protected by the all times. for condensing sure the needle is capped fume hood sash. 2. Flame dry a 2-necked flask. Fit one neck up to 1 L of during any transport. with a septum and the other neck with a -78 ammonia. Hand Protection: 8 mil ºC (dry ice / acetone) cold finger or If the balloon enlarges minimum Nitrile gloves must be , which is also connected to a Alternative during condensation, used to prevent incidental balloon apparatus. The balloon apparatus procedure lower the flow rate of contact. Gloves must be will allow for a place for gaseous ammonia included for ammonia to lower the inspected prior to use. Cotton gas to escape to. Evacuate and backfill the condensing <10 internal pressure. or leather gloves may be used system with N2. Cool the flask down in a -78 mL ammonia. Maintain both the cold as well to prevent mechanical ºC bath. Affix a long needle to the end of the finger / condenser and injury. Wash and dry hands tubing from the ammonia tank regulator. the main bath at -78 ºC after use. Pierce the needle into the septum and open for the duration of the the ammonia valve slowly. This will allow for condensation. Clothing: Wear fire/flame the ammonia to condense into the reaction resistant lab coat (100% cotton flask. Once a sufficient amount of ammonia based); cotton based has condensed into the flask, shut off the clothing/attire; full length pants valve, and add your substrates/reagents to or equivalent; and close-toed, the reaction while maintaining a low close-heeled shoes. temperature. 3. Procedure for condensing < 10 mL of ammonia: Same as above, except a balloon apparatus may be used in place of a cold finger or condenser that is attached to a balloon apparatus.

Notes Any deviation from this SOP requires approval from PI. Initials of individuals using this procedure

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Procedure/Use Scale Engineering PPE (eye, face, gloves, clothing) Procedure Steps and Special Precautions for Controls/Equipment this Procedure 5. Quenching/ The ammonia All reactions must be Eye Protection: Wear tight- 1. Ensure hood inflow velocity is at least 100 Evaporating cylinder used performed in a fitting safety goggles or safety fpm and that the ammonia tank is securely Ammonia must fit inside of properly operating glasses with side shields. fastened with chain clamps or ring clamps the fume hood. fume hood. inside the fume hood. The ammonia tank must Face Protection: Use a face be stored and used in a fume hood at all times. This procedure is Keep the reaction as shield if not protected by the 2. When the reaction is complete, remove the for quenching up far back in the hood fume hood sash. cold finger or condenser from one neck, and to 1 L of as possible, keep the replace the septum from the other neck with a ammonia. hood sash low, and Hand Protection: 8 mil gas inlet adapter with a positive flow of avoid working in the minimum Nitrile gloves must be nitrogen. Remove the reaction vessel from the hood while ammonia used to prevent incidental cold bath and let it stand at room temperature is evaporating. contact. Gloves must be until all the ammonia is evaporated, and the inspected prior to use. Cotton or vessel reaches room temperature. leather gloves may be used as well to prevent mechanical Optional: Before removing the reaction from injury. Wash and dry hands after the cold bath, slowly dilute the reaction mixture use. with an appropriate solvent, such as diethyl ether or methanol, with a volume equal to 20% Clothing: Wear fire/flame of the reaction volume (e.g. 200 mL methanol resistant lab coat (100% cotton for 1L of ammonia). based); cotton based clothing/attire; full length pants Precaution: or equivalent; and close-toed, -Do not use a bath to warm the reaction unless close-heeled shoes. the ammonia is diluted with a cosolvent. This is to prevent eruption of the reaction during warming. - Ammonia causes severe skin burns and eye damage. Avoid working in the hood while ammonia is evaporating.

Notes Any deviation from this SOP requires approval from PI. Initials of individuals using this procedure

Rev. Date: June 10, 2013 11 Acutely Toxic Gases Class SOP

Sarpong Group Notes on Acutely Toxic Gases Potential Hazards/Toxicity Before working with any Acutely Toxic Gases, review the UC-Berkeley EH&S publication Toxic Gas Program (2011). http://www.ehs.berkeley.edu/images/ehs/healthsafety/toxicgasprogram.pdf There is a broad spectrum of toxic compressed gases. Increased recognition of the hazards associated with the transportation, operation, and storage of these gases is essential. Toxic gases are gases that may cause significant acute health effects at low concentrations. Health effects may include severe skin or eye irritation, pulmonary edema, neurotoxicity, or other potentially fatal conditions. Required Training/Approvals

 Prior to conducting any work with an acutely toxic chemical, a designated person must provide training to his/her laboratory personnel specific to the hazards involved in working with this substance, work area decontamination, and emergency procedures.  The Principal Investigator must provide his/her laboratory personnel with a copy of this Chemical Class SOP, any other relevant SOP, and a copy of relevant SDSs provided by the manufacturer.

Administrative Controls

 Never work alone with extremely hazardous materials/operations. Ask the Principal Investigator for specific prohibitions (if any) on working alone with any acutely toxic chemical.  Certain extremely hazardous operations should not be performed if the PI or Lab Safety Contact(s) are not present.  Eliminate or substitute for a less hazardous material when possible.  Design your experiment to use the least amount of material possible to achieve the desired result.  Do not exceed the scale of procedures specified in Lab Specific Instructions without approval of the PI.  Verify your experimental set-up and procedure prior to use.  Know the location of the nearest eyewash, safety shower, and fire extinguisher before beginning work.  Certain extremely hazardous operations should be performed in a designated area. A designated area is where select carcinogens, reproductive toxins, and highly toxic materials are used and stored. A designated area can be as large as the entire laboratory, or as small as a specific laboratory workbench, or a laboratory hood.  Designated areas must be clearly marked with signs and may include an appropriate warning; for example: WARNING! ACUTELY TOXIC CHEMICAL WORK AREA!  Upon leaving a designated area, remove any personal protective equipment worn and wash hands, forearms, face, and neck.  Decontamination procedures vary depending on the material being handled. The toxicity of some materials can be neutralized with other reagents.  Decontaminate vacuum pumps or other contaminated equipment (glassware) before removing them from the designated area.

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13 - Documentation of Training (signature of all users is required)  Prior to conducting any work with acutely toxic gases, designated personnel must provide training to his/her laboratory personnel specific to the hazards involved in working with this substance, work area decontamination, and emergency procedures.

 The Principal Investigator must provide his/her laboratory personnel with a copy of this SOP and a copy of the SDS provided by the manufacturer.

I have read and understand the content of this SOP:

Name Signature Identifier Date

Rev. Date: June 10, 2013 13 Acutely Toxic Gases Class SOP

Appendix – List of Acutely Toxic Gases in Settlement Agreement

Chemical Name/Formula CAS# Chemical Name/Formula CAS#

Ammonia NH3 7664-41-7 Arsenic pentafluoride AsF5 7784-36-3 Arsine AsH3 7784-42-1 Boron trichloride BCl3 10294-34-5 Boron trifluoride BF3 7637-07-2 Carbon monoxide CO 630-08-0 Cyanogen C2N2 460-19-5 Cyanogen chloride NCCl 506-77-4 Chlorine Cl2 7782-50-5 Diazomethane H2CN2 334-88-3 Diborane B2H6 19287-45-7 Fluorine F2 7782-41-4 Germane GeH4 7782-65-2 Hexaethyltetraphosphate 757-58-4 C12H30O13P4 Hydrogen bromide HBr 10035-10-6 Hydrogen Chloride HCl 7647-01-0

Hydrogen fluoride HF 7664-39-3 Hydrogen sulfide H2S 7783-06-4 Hydrogen selenide H2Se 7783-07-5 Methyl mercaptan CH3SH 74-93-1 Nitric oxide NO 10102-43-9 Nitrogen dioxide NO2 10102-44-0 Nitrogen tetroxide N2O4 10544-72-6 Oxygen difluoride OF2 7783-41-7 Phosgene COCl2 75-44-5 Phosphine PH3 75-45-5 Phosphorous pentafluoride PF5 7641-19-0 Selenium hexafluoride SeF6 7783-79-1 Stibine SbH3 7803-52-3 Sulfur tetrafluoride SF4 7783-60-0 Trimethylsilyldiazomethane (CH3)3SiCHN2 18107-18-1

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