The Synthesis of a Polydiacetylene to Create a Novel Sensory Material
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14.8 Organic Synthesis Using Alkynes
14_BRCLoudon_pgs4-2.qxd 11/26/08 9:04 AM Page 666 666 CHAPTER 14 • THE CHEMISTRY OF ALKYNES The reaction of acetylenic anions with alkyl halides or sulfonates is important because it is another method of carbon–carbon bond formation. Let’s review the methods covered so far: 1. cyclopropane formation by the addition of carbenes to alkenes (Sec. 9.8) 2. reaction of Grignard reagents with ethylene oxide and lithium organocuprate reagents with epoxides (Sec. 11.4C) 3. reaction of acetylenic anions with alkyl halides or sulfonates (this section) PROBLEMS 14.18 Give the structures of the products in each of the following reactions. (a) ' _ CH3CC Na| CH3CH2 I 3 + L (b) ' _ butyl tosylate Ph C C Na| + L 3 H3O| (c) CH3C' C MgBr ethylene oxide (d) L '+ Br(CH2)5Br HC C_ Na|(excess) + 3 14.19 Explain why graduate student Choke Fumely, in attempting to synthesize 4,4-dimethyl-2- pentyne using the reaction of H3C C'C_ Na| with tert-butyl bromide, obtained none of the desired product. L 3 14.20 Propose a synthesis of 4,4-dimethyl-2-pentyne (the compound in Problem 14.19) from an alkyl halide and an alkyne. 14.21 Outline two different preparations of 2-pentyne that involve an alkyne and an alkyl halide. 14.22 Propose another pair of reactants that could be used to prepare 2-heptyne (the product in Eq. 14.28). 14.8 ORGANIC SYNTHESIS USING ALKYNES Let’s tie together what we’ve learned about alkyne reactions and organic synthesis. The solu- tion to Study Problem 14.2 requires all of the fundamental operations of organic synthesis: the formation of carbon–carbon bonds, the transformation of functional groups, and the establish- ment of stereochemistry (Sec. -
Reliable Structures and Energetics for Two New Delocalized Pбббp
PAPER www.rsc.org/pccp | Physical Chemistry Chemical Physics Reliable structures and energetics for two new delocalized pÁÁÁp prototypes: cyanogen dimer and diacetylene dimerwz Brian W. Hopkins, Adel M. ElSohly and Gregory S. Tschumper* Received 22nd November 2006, Accepted 3rd January 2007 First published as an Advance Article on the web 7th February 2007 DOI: 10.1039/b616878g Two new prototype delocalized pÁÁÁp complexes are introduced: the dimers of cyanogen, (NRC–CRN)2, and diacetylene, (HCRC–CRCH)2. These dimers have properties similar to larger delocalized pÁÁÁp systems such as benzene dimer but are small enough that they can be probed in far greater detail with high accuracy electronic structure methods. Parallel-slipped and T-shaped structures of both cyanogen dimer and diacetylene dimer have been optimized with 15 different procedures. The effects of basis set size, theoretical method, counterpoise correction, and the rigid monomer approximation on the structure and energetics of each dimer have been examined. MP2 and CCSD(T) optimized geometries for all four dimer structures are reported, as well as estimates of the CCSD(T) complete basis set (CBS) interaction energy for every optimized geometry. The data reported here suggest that future optimizations of delocalized pÁÁÁp clusters should be carried out with basis sets of triple-z quality. Larger basis sets and the expensive counterpoise correction to the molecular geometry are not necessary. The rigid monomer approximation has very little effect on structure and energetics of these dimers and may be used without consequence. Due to a consistent cancellation of errors, optimization with the MP2 method leads to CCSD(T)/CBS interaction energies that are within 0.2 kcal molÀ1 of those for structures optimized with the CCSD(T) method. -
S1 Supporting Information Copper-Catalyzed
Supporting Information Copper-Catalyzed Semihydrogenation of Internal Alkynes with Molecular Hydrogen Takamichi Wakamatsu, Kazunori Nagao, Hirohisa Ohmiya*, and Masaya Sawamura* Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan Table of Contents Instrumentation and Chemicals S1 Characterization Data for Alkynes S1–S2 Procedure for the Copper-Catalyzed Semihydrogenation of Alkynes S2 Characterization Data for Alkenes S3–S5 References S5 NMR Spectra S6–S31 Instrumentation and Chemicals NMR spectra were recorded on a JEOL ECX-400, operating at 400 MHz for 1H NMR and 100.5 13 1 13 MHz for C NMR. Chemical shift values for H and C are referenced to Me4Si and the residual solvent resonances, respectively. Mass spectra were obtained with Thermo Fisher Scientific Exactive, JEOL JMS-T100LP or JEOL JMS-700TZ at the Instrumental Analysis Division, Equipment Management Center, Creative Research Institution, Hokkaido University. TLC analyses were performed on commercial glass plates bearing 0.25-mm layer of Merck Silica gel 60F254. Silica gel (Kanto Chemical Co., Silica gel 60 N, spherical, neutral) was used for column chromatography. Materials were obtained from commercial suppliers or prepared according to standard procedure unless otherwise noted. CuCl was purchased from Aldrich Chemical Co., stored under nitrogen, and used as it is. NatOBu, octane and 6-dodecyne 1a were purchased from TCI Chemical Co., stored under nitrogen, and used as it is. Diphenylacetylene 1j was purchased from Wako Chemical Co., stored under nitrogen, and used as it is. 1,4-Dioxane was purchased from Kanto Chemical Co., distilled from sodium/benzophenone and stored over 4Å molecular sieves under nitrogen. -
Development of a Solid-Supported Glaser-Hay Reaction and Utilization in Conjunction with Unnatural Amino Acids
W&M ScholarWorks Dissertations, Theses, and Masters Projects Theses, Dissertations, & Master Projects 2015 Development of a Solid-Supported Glaser-Hay Reaction and Utilization in Conjunction with Unnatural Amino Acids Jessica S. Lampkowski College of William & Mary - Arts & Sciences Follow this and additional works at: https://scholarworks.wm.edu/etd Part of the Organic Chemistry Commons Recommended Citation Lampkowski, Jessica S., "Development of a Solid-Supported Glaser-Hay Reaction and Utilization in Conjunction with Unnatural Amino Acids" (2015). Dissertations, Theses, and Masters Projects. Paper 1539626985. https://dx.doi.org/doi:10.21220/s2-r9jh-9635 This Thesis is brought to you for free and open access by the Theses, Dissertations, & Master Projects at W&M ScholarWorks. It has been accepted for inclusion in Dissertations, Theses, and Masters Projects by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. Development of a Solid-Supported Glaser-Hay Reaction and Utilization in Conjunction with Unnatural Amino Acids Jessica Susan Lampkowski Ida, Michigan B.S. Chemistry, Siena Heights University, 2013 A Thesis presented to the Graduate Faculty of the College of William and Mary in Candidacy for the Degree of Master of Science Chemistry Department The College of William and Mary May, 2015 COMPLIANCE PAGE Research approved by Institutional Biosafety Committee Protocol number: BC-2012-09-13-8113-dyoung01 Date(s) of approval: This protocol will expire on 2015-11-02 APPROVAL PAGE This -
Guidance Document Peroxide-Forming Chemicals
Guidance Document Peroxide-Forming Chemicals Some chemicals can form peroxides under normal storage conditions. Some of the peroxide chemicals are unstable, especially when dried or concentrated, and can explode violently when subjected to heat, light or mechanical shock. In addition, some of the inadvertently formed peroxides can initiate other unexpected violent reactions (e.g. polymerizations) with other chemicals. When possible and practical for your work, purchase chemicals that have inhibitors added by the manufacturer. Label peroxide-forming chemicals with date received and date opened. Store peroxide-formers in airtight opaque containers with screw caps. Consider oxygen exclusion methods such as purging with inert gas or sealing containers with parafilm. Inspect containers for signs of peroxide formation. Do not open a container which has crystals or a visible cloudiness. Call EHS to come remove it. The friction caused by opening a lid can cause an explosion. Liquids can be tested for presence of peroxide. This is especially important prior to distilation. Most explosions of peroxide forming chemicals occur when a material is distilled to dryness. Peroxide test kits are available from chemical vendors. Contact EHS for additional guidance. Classification Table for Peroxide-Forming Chemicals Class I:: Unsaturated materials, especially those of low molecular weight, may polymerize violently and hazardously due to peroxide initiation. These chemicals can spontaneously decompose, becoming explosive after exposure to air with concentration. Discard unopened containers within 3 months. Opened containers should be tested for peroxides every 2 months. Acrylic acid Tetrafluoroethylene Acrylonitrile Vinyl acetate 1,3-Butadiene Vinyl acetylene Chlorobutadiene (chloroprene) Vinyl chloride Chlorotrifluoroethylene Vinyl pyridine Methyl methacrylate Vinylidiene chloride Styrene Class II: The following chemicals are a peroxide hazard upon concentration (distillation/evaporation). -
Chemical Reactivity of Naphthalenecarboxylate-Protected
Article pubs.acs.org/JPCC Chemical Reactivity of Naphthalenecarboxylate-Protected Ruthenium Nanoparticles: Intraparticle Charge Delocalization Derived from Interfacial Decarboxylation † † † ‡ ‡ † ‡ Limei Chen, Peiguang Hu, Christopher P. Deming, Wei Li, Ligui Li, and Shaowei Chen*, , † Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States ‡ New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China ABSTRACT: Ruthenium nanoparticles were prepared by thermolytic reduction of RuCl3 in 1,2-propanediol containing sodium 2-naphthalenecarboxylate. Transmission electron microscopic measurements showed that the average diameter of the resulting 2- naphthalenecarboxylate-protected ruthenium nanoparticles (RuCOONA) was 1.30 ± 0.27 nm. Interestingly, hydrothermal treatment of the nanoparticles at controlled temperatures led to decarboxylation at the metal−ligand interface, and the naphthalenyl moieties became directly bonded to the metal cores, which was confirmed by infrared and X-ray photoelectron spectroscopic measurements. In comparison with the as-produced RuCOONA nanoparticles, the decarboxylated nanoparticles (RuNA) exhibited markedly different optical and electronic properties, as manifested by an apparent red shift of the photoluminescence profiles, which was ascribed to electronic coupling between the particle-bound naphthalene groups. Electrochemical measurements exhibited consistent results where a negative shift was observed of the formal potential of the particle-bound naphthalene moieties. This was attributed to intraparticle charge delocalization that led to extended spilling of nanoparticle core electrons to the naphthalene moieties. ■ INTRODUCTION Conjugated metal−ligand interfacial bonds may also be produced by exploiting the unique interfacial reactivity of Organically capped metal nanoparticles have been attracting organic ligands on nanoparticle surfaces. -
Strain-Promoted 1,3-Dipolar Cycloaddition of Cycloalkynes and Organic Azides
Top Curr Chem (Z) (2016) 374:16 DOI 10.1007/s41061-016-0016-4 REVIEW Strain-Promoted 1,3-Dipolar Cycloaddition of Cycloalkynes and Organic Azides 1 1 Jan Dommerholt • Floris P. J. T. Rutjes • Floris L. van Delft2 Received: 24 November 2015 / Accepted: 17 February 2016 / Published online: 22 March 2016 Ó The Author(s) 2016. This article is published with open access at Springerlink.com Abstract A nearly forgotten reaction discovered more than 60 years ago—the cycloaddition of a cyclic alkyne and an organic azide, leading to an aromatic triazole—enjoys a remarkable popularity. Originally discovered out of pure chemical curiosity, and dusted off early this century as an efficient and clean bio- conjugation tool, the usefulness of cyclooctyne–azide cycloaddition is now adopted in a wide range of fields of chemical science and beyond. Its ease of operation, broad solvent compatibility, 100 % atom efficiency, and the high stability of the resulting triazole product, just to name a few aspects, have catapulted this so-called strain-promoted azide–alkyne cycloaddition (SPAAC) right into the top-shelf of the toolbox of chemical biologists, material scientists, biotechnologists, medicinal chemists, and more. In this chapter, a brief historic overview of cycloalkynes is provided first, along with the main synthetic strategies to prepare cycloalkynes and their chemical reactivities. Core aspects of the strain-promoted reaction of cycloalkynes with azides are covered, as well as tools to achieve further reaction acceleration by means of modulation of cycloalkyne structure, nature of azide, and choice of solvent. Keywords Strain-promoted cycloaddition Á Cyclooctyne Á BCN Á DIBAC Á Azide This article is part of the Topical Collection ‘‘Cycloadditions in Bioorthogonal Chemistry’’; edited by Milan Vrabel, Thomas Carell & Floris P. -
A. Discovery of Novel Reactivity Under the Sonogashira Reaction Conditions B. Synthesis of Functionalized Bodipys and BODIPY-Sug
A. Discovery of novel reactivity under the Sonogashira reaction conditions B. Synthesis of functionalized BODIPYs and BODIPY-sugar conjugates Ravi Shekar Yalagala, M.Phil Department of Chemistry Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Faculty of Mathematics and Science, Brock University St. Catharines, Ontario © 2016 ABSTRACT A. During our attempts to synthesize substituted enediynes, coupling reactions between terminal alkynes and 1,2-cis-dihaloalkenes under the Sonogashira reaction conditions failed to give the corresponding substituted enediynes. Under these conditions, terminal alkynes underwent self-trimerization or tetramerization. In an alternative approach to access substituted enediynes, treatment of alkynes with trisubstituted (Z)- bromoalkenyl-pinacolboronates under Sonogashira coupling conditions was found to give 1,2,4,6-tetrasubstituted benzenes instead of Sonogashira coupled product. The reaction conditions and substrate scopes for these two new reactions were investigated. B. BODIPY core was functionalized with various functional groups such as nitromethyl, nitro, hydroxymethyl, carboxaldehyde by treating 4,4-difluoro-1,3,5,7,8- pentamethyl-2,6-diethyl-4-bora-3a,4a-diaza-s-indacene with copper (II) nitrate trihydrate under different conditions. Further, BODIPY derivatives with alkyne and azido functional groups were synthesized and conjugated to various glycosides by the Click reaction under the microwave conditions. One of the BODIPY–glycan conjugate was found to form liposome upon rehydration. The photochemical properties of BODIPY in these liposomes were characterized by fluorescent confocal microscopy. ii ACKNOWLEDGEMENTS I am extremely grateful to a number of people. Without their help, this document would have never been completed. First and foremost, I would like to thank my supervisor and mentor Professor Tony Yan for his guidance and supervision to make the thesis possible. -
Chromatic Studies of a Polymerizable Diacetylene Hydrogen Bonding Self-Assembly: a “Self-Folding” Process to Explain the Chromatic Changes of Polydiacetylenes
3972 Langmuir 1999, 15, 3972-3980 Chromatic Studies of a Polymerizable Diacetylene Hydrogen Bonding Self-Assembly: A “Self-Folding” Process To Explain the Chromatic Changes of Polydiacetylenes Qun Huo, K. C. Russell,† and Roger M. Leblanc* Center for Supramolecular Science, Department of Chemistry, University of Miami, P.O. Box 249118, Coral Gables, Florida 33124 Received January 11, 1999. In Final Form: March 9, 1999 In the present study, a new diacetylene compound (PDATAZ), which readily forms a complementary hydrogen bonding self-assembly at the air-water interface or in the solid state with barbituric acid (BA) or cyanuric acid (CA), was designed and synthesized. The photopolymerization studies of PDATAZ and its assembly with BA or CA have revealed some important insights on the chromatic properties of polydiacetylenes. It was found that the chromatic property of polydiacetylenes is determined by whether the polymer chain is capable of adopting a linear chainlike shape. With the continuous increase of the length of the polymer chain, the original linear polyenyne backbone starts to “self-fold” to a “zigzag” structure due to the free rotation of single bonds within the polymer chain. The efficient π-electron delocalization along the polyenyne backbone is interrupted by this process, leading to a chromatic change from the blue to red form of polydiacetylenes. If there are strong intermolecular interactions existing between the polar groups of the side chains, such as the complementary hydrogen bonding network between the triaminotriazine (TAZ) moiety of the diacetylene amphiphile and its complementary components, the movement of the side chains is restricted and the folding process of the polymer backbone is inhibited. -
Molecular Design and Self-Assembly of Polydiacetylene for Biosensors and Sensor Arrays
Molecular Design and Self-assembly of Polydiacetylene for Biosensors and Sensor Arrays by Ji Seok Lee A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Macromolecular Science and Engineering) in The University of Michigan 2011 Doctoral Committee: Professor Jinsang Kim, Chair Professor L. Jay Guo Professor Kenichi Kuroda Professor David C. Martin Jiseok Lee © 2011 All Rights Reserved ACKNOWLEDGMENTS I would like to thank my advisor, Professor Jinsang Kim. He guided me with a great patience for my experimental kowledge as well as my presentation skill improvement. He has always encouraged me even when I made mistakes. I would like to give my sincere respect to Prof Kim for his generous concern. I could not have published good journals, enjoyed the research and successfully finished the doctoral program without his advice. I also would like to thank my committee members, Prof Martin, Prof Kuroda and Prof Guo. Under their guidance, I could draw a big picture of my research and train myself as a scientist not a technician. It was a great honor for me to do my research under their thoughtful guidance. I also thanks to Prof Laine and Nonna. I could finish my degree as a Macro student by his permission. Also Nonna helped me a lot for every student business. She saved me a lot of times from troubles. I would like to thank all of my lab members. It was good experience for me to work with them. The past members of the Kim’s group, Dr Kim and Dr Jo gave me a lot of advice. -
Theoretical Studies on Hydrogen Bonding in ~--Electron Systems: a Note on the Structural Features of Diacetylene-Hydrogen Fluoride Complexes
Proc. Indian Acad. Sci. (Chem. Sci.), Vol. 100, No. 4, August 1988, pp. 293-295 (~) Printed in India. Theoretical studies on hydrogen bonding in ~--electron systems: A note on the structural features of diacetylene-hydrogen fluoride complexes CHITRANI MEDHI and S P BHATTACHARYYA Department of Physical Chemistry. Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700 032, India. MS received 7 December 1987; revised 27 April 1988 Abstract. Ab initio supermolecularSCF calculations at the STO-3G level are reported for the diacetylene-hydrogenfluoride complexes. The reverse ~-complex is predicted to have somewhat higher stability and H-bond"strength than the r Keywords. Ab initio supermolecular SCF calculations; intermolecular interactions; diacetylene-hydrogen fluoride complexes; hydrogen bonding in It-systems. 1. Introduction The possibility of hydrogen-bonding interaction with ~--bonded systems has attracted considerable attention in the recent years (Barnes et al 1973; McDonald et al 1980; Legon et al 1981; Andrews et al 1982a, b). Of special interest have been systems having ~'-bonds in conjugation (Baiocchi et al 1983; Andrews et al 1985; Patten and Andrews 1985). Infrared spectroscopic measurements on conjugated diene-hydrogen fluoride complexes in a solid argon matrix indicate that the HF submolecule oscillates appreciably around its average position in the complex (Patten and Andrews 1985). It points to a model in which the HF submolecule probably oscillates between the two equivalent ~'-systems in the diene. Diacetylene also has got two equivalent ~r-systems held in conjugation with the difference that the distance between the two ~r-sites is much larger, thereby reducing the probability of exchange of an HF submolecule between the two ~'-bonds. -
Indolizidines and Quinolizidines: Natural Products and Beyond
Indolizidines and quinolizidines: natural products and beyond Edited by Joseph Philip Michael Generated on 05 October 2021, 08:24 Imprint Beilstein Journal of Organic Chemistry www.bjoc.org ISSN 1860-5397 Email: [email protected] The Beilstein Journal of Organic Chemistry is published by the Beilstein-Institut zur Förderung der Chemischen Wissenschaften. This thematic issue, published in the Beilstein Beilstein-Institut zur Förderung der Journal of Organic Chemistry, is copyright the Chemischen Wissenschaften Beilstein-Institut zur Förderung der Chemischen Trakehner Straße 7–9 Wissenschaften. The copyright of the individual 60487 Frankfurt am Main articles in this document is the property of their Germany respective authors, subject to a Creative www.beilstein-institut.de Commons Attribution (CC-BY) license. Indolizidines and quinolizidines: natural products and beyond Joseph P. Michael Editorial Open Access Address: Beilstein Journal of Organic Chemistry 2007, 3, No. 27. Molecular Sciences Institute, School of Chemistry, University of the doi:10.1186/1860-5397-3-27 Witwatersrand, PO Wits 2050, South Africa Received: 24 September 2007 Email: Accepted: 26 September 2007 Joseph P. Michael - [email protected] Published: 26 September 2007 © 2007 Michael; licensee Beilstein-Institut. License and terms: see end of document. Alkaloids occur in such astonishing profusion in nature that amphibians. [5,6] It is thus hardly surprising that both the struc- one tends to forget that they are assembled from a relatively tural elucidation and the total synthesis of these and related small number of structural motifs. Among the motifs that are alkaloids continue to attract the attention of eminent chemists, most frequently encountered are bicyclic systems containing as borne out by the seemingly inexhaustible flow of publica- bridgehead nitrogen, especially 1-azabicyclo[4.3.0]nonanes and tions in prominent journals.