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Saturated Hydrocarbons

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Saturated Hydrocarbons Saturated hydrocarbons Chapter 12 Organic and inorganic compounds • Organic chemistry concerns the chemistry of hydrocarbon compounds contain C and H, but possibly other p-block elements also. • At the time of printing (Stoker, 5th edition), there were around 5 million organic compounds catalogued • Inorganic chemistry concerns the chemistry of the other 117 elements. Around 1.5 million of these are known Non-polar hydrocarbon tail A polar, charged group Organic and inorganic compounds • The reason why there are so many organic compounds is that carbon is very good at forming bonds with other carbon atoms. • Carbon atoms are commonly found in chain-like arrangements or rings (or both within the same molecule). • Carbon has four valence electrons. In organic compounds, it forms four covalent bonds to obtain an octet. double bond plus two single bonds triple bond plus two double bonds four single bonds single bond Hydrocarbons and hydrocarbon derivatives • Hydrocarbons are compounds that contain only carbon and hydrogen in their formulas. • Two basic categories of hydrocarbon: – Saturated hydrocarbons: all carbon atoms are connected together with single bonds – Unsaturated hydrocarbons: involve one or more multiple (double, triple) C-C bonds • Hydrocarbon derivatives contain carbon and hydrogen, and one or more other elements (P, N, O, Cl, etc.) Hydrocarbons and hydrocarbon derivatives • Saturated hydrocarbons may be found in two possible formats: an acyclic, 6-C chain a cyclic 6-C structure Alkanes: acyclic saturated hydrocarbons • An alkane is a saturated hydrocarbon that is acyclic (does not possess ring-structure). • Because all C-C bonds are single bonds (and because the other bonds that carbon needs to get an octet are to H-toms), alkanes have the general formula CnH2n+2 (n = # of C-atoms) Examples of alkanes: CH4 C2H6 C3H8 Alkanes: acyclic saturated hydrocarbons • In an alkane, each carbon is tetrahedral (it has four bonds to other atoms. Rem: VSEPR) Structural formulas: show how the atoms are connected Chemical (molecular) formulas: CH4 C2H6 C3H8 Alkanes: acyclic saturated hydrocarbons • Chemical formulas for alkanes are written as CnH2n+2; however, structural formulas give more information. – Chemical formula reveals the type and number of each element in the compound – Structural formulas show how each atom in the molecule is connected expanded structural formula condensed structural CH4 CH3-CH3 CH3-CH2-CH3 formula ethane propane name methane Alkanes: acyclic saturated hydrocarbons • For longer carbon chains, an abbreviated, condensed structural formula is advantageous, as it shows most of the information of the expanded formula without taking up as much space CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH3 CH3-(CH2)6-CH3 An 8-carbon chain (two CH3-groups 6 –CH2- units between linked by a 6-carbon chain (6-CH2- units) two CH3-groups Alkanes: acyclic saturated hydrocarbons • Sometimes, a simple skeletal structural formula can be used to convey hydrocarbon structure CH3-CH2-CH2-CH2-CH3 skeletal structural formula condensed structural formula mean the same thing Alkane isomerism • The types of alkanes we’ve considered so far involve “straight chain” types, where the carbon atoms form a continuous series (i.e. no branches). • When alkanes having four or more carbons are considered, there is more than one structural formula that can be used to describe a given molecular formula. Alkane isomerism • The formula C4H10 can be represented by the following condensed structural formulas: butane (or n-butane) isobutane These compounds possess the same chemical formula, but differ in the way the atoms are arranged (isomers) Alkane isomerism • The C4H10 shown on the left is called a continuous chain alkane (or an unbranched/”straight-chain” alkane). • The one on thebutane right is called a “branched-chain” alkane (or n-butane) isobutane These are called “constitutional isomers” which differ in their atom-to-atom connectivity Alkane isomerism • As the number of carbon atoms in the alkane grows, so do the number of possible isomers. pentane isopentane neopentane Conformations of alkanes • The carbon-carbon bonds in alkanes permit rotation of each carbon-group with respect to the others that are chemically bound to it. Conformations of alkanes • Conformations are specific, 3-dimensional arrangements of atoms in organic molecules (at some instant) that result from rotation about C-C single bonds. • Several conformations of a six-carbon chain are shown using the skeletal structures below: All the same molecule: C6H14 Conformations of alkanes • Note that the following two skeletal structures describe two different alkanes: Alkane on the left is a 6-carbon, continuous chain structure. Alkane on the right is a branched structure (a 5-carbon, continuous chain that has a 1-carbon branch) Conformations of alkanes • Do the following pairs of condensed structural formulas describe the same alkane? a) b) c) IUPAC nomenclature for alkanes • The names that have been shown for the branched alkanes so far are common names (made as these compounds were identified). • As the number of organic compounds catalogued grew, a system for naming was developed by the International Union of Pure and Applied Chemistry (IUPAC). • The basic system used is one that employs a prefix-type name. IUPAC nomenclature for alkanes • Names for continuous chain alkanes (first ten) are shown below. The names use a prefix (e.g. meth-) to designate the number of carbon atoms in the chain. Prefix Meth- Eth- Prop- But- Pent- Hex- Hept- Oct- Non- Dec- IUPAC nomenclature for alkanes • Branched-chain alkanes can be described as continuous-chain alkanes with branches (substituents). • The IUPAC system of naming branched-chain alkanes describes the type and location of substituents before the name of the longest, continuous chain of carbon atoms in the alkane. IUPAC nomenclature for alkanes • Substituents in branched-chain alkanes are called alkyl groups. An alkyl group is the group of atoms that would be created by removing a hydrogen atom from an alkane. They are named according to the alkane from which they are derived. methane a "methyl" substituent To get the substituent name: take the alkane name and replace the “ane” part with “yl” propane a "propyl" substituent IUPAC nomenclature for alkanes • To name a branched alkane, follow these steps: 1) Identify the longest, continuous carbon chain in the structure. This will be the base of the branched alkane’s name. a 4-carbon, continuous chain So far, we know this compound is going to be called some kind of butane) IUPAC nomenclature for alkanes 2) Number this chain in a way that gives the carbon(s) with the substituent the lowest possible, overall numbering. 1 2 3 4 The methyl substituent is thus located on C-2 (carbon-2) (something something butane) IUPAC nomenclature for alkanes • After locating the alkyl substituent by number, prefix the parent-chain alkane name (the longest, continuous carbon chain) with the number and the1 name2 of3 the4 substituent: 2-methylbutane Separate the number from the substituent name with a hyphen, and the last substituent name reads directly into the parent chain alkane name IUPAC nomenclature for alkanes • Another example 1) Find the longest, continuous chain of C-atoms 2) Number them in a way that gives all substituents the lowest total numbering 3) Prefix the name of the parent alkane with the number and name of the substituent IUPAC nomenclature for alkanes • One with multiple substituents: 2,3,4-trimethylhexane In cases where multiple substituents of the same type are present, prefix the substituent name with di, tri, tetra, etc. to indicate how many of them are present IUPAC nomenclature for alkanes • If more than one kind of substituent is present, the alphabetic order of the substituents take priority over the number of the substituent when numbering the parent chain Separate different substituents with hyphens 3-ethyl-2-methylhexane 3-ethyl-4,5-dipropyloctane (not 2-methyl-3-ethylhexane) The prefix part of the substituent is not counted for alphabetical ordering IUPAC nomenclature for alkanes • IUPAC punctuation rules: 1. Separate numbers from letters with hyphens 2. Separate numbers from other numbers with commas 3. Don’t separate the last substituent name from the parent alkane chain 2 4-ethyl-2,3-dimethyl-5-propylnonane 1 3 Line-angle structural formulas for alkanes • Line-angle structural formulas describe carbon- carbon bonds with straight lines (each point in the diagram represents a carbon atom with four bonds to carbon(s) and hydrogen(s) around it) = = It is understood that each C-atom has four bonds; C-H bonds are there, but not shown Classification of carbon atoms • The carbon atoms in organic structures are classified as primary, secondary, tertiary, or quaternary, depending on the number of other carbon atoms bound to them. – Primary (1o) C: bounds to one other C-atom – Secondary (2o) C: bound to two other C-atoms – Tertiary (3o) C: bound to three other C-atoms – Quaternary (4o) C: bound to four other C-atoms 1o 4o 3o 2o Branched-chain alkyl groups • Sometimes, branched-chain substituents are encountered. These are named according to the parent alkane from which they are derived. Substituent derives from a 4-C alkane (butane) and point of attachment Substituent derives from a 3-C alkane is a tertiary C of the alkane (propane) and point of attachment is a secondary C of the alkane 4-Isopropyloctane 4-tert-Butyloctane could also call this 4-sec-Propyloctane Branched-chain alkyl groups Cycloalkanes • Cyclic alkanes (cycloalkanes) are alkane chains where the end carbons are linked together (need to kick off 2 H atoms from the formula of the corresponding straight-chain alkane to get the cycloalkane formula). • The general formula for a cycloalkane is CnH2n Cyclooctane Cyclobutane Cyclohexane Cyclopropane Cyclopentane Cycloheptane Cyclononane = C6H12 C6H12 IUPAC nomenclature for substituted cycloalkanes • If one substituent exists on a cycloalkane, no numbering is needed to denote its location Ethylcyclohexane IUPAC nomenclature for substituted cycloalkanes • If two substituents are present, the ring is numbered follows alphabetic priority.
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