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orgo naming - Chemistry 1AA3 1 Naming Organic Compounds(1...

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Chemistry 1AA3 1 Naming Organic Compounds (1) Substituents, functional groups, structural motifs (2) Naming branched-chain alkanes (1) Substituents, Functional Groups, Structural Motifs Functional groups versus substituents All functional groups can be substituents, but simple alkyl substituents are not considered functional groups. We do not consider alkyl substituents to be a functional groups (see class notes), even though it they listed in Table 26.2 of Petrucci (9 th ed.). Structural motifs Certain structures are so common that they get their own names, even though they are not functional groups in their own right. The formyl and acetyl groups are two common structural motifs. O H O H 3 C formyl group acetyl group Structural motif examples O H H O H 3 C CH 3 formaldehyde acetone O H OH O H 3 C NH 2 formic acid acetamide Acetone and acetamide both contain acetyl groups, but their reactivities and properties are defined by their functional groups: a ketone and amide, respectively. (2) Naming Branched-Chain Alkanes : IUPAC Rules for Naming Name: prefix – parent – suffix prefix : substituents and their locations parent : # of C atoms in the longest chain suffix : What functional group is it? Four steps: (1) Use the longest continuous carbon chain as the parent name.
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Chemistry 1AA3 2 example #1: CH 3 CH 2 CH 2 CHCH 3 CH 2 CH 3 CH 3 CH 2 CH 2 CHCH 3 CH 2 CH 3 5 4 3 5 4 3 6 2 2 1 1 a hexane a pentane not If there are 2 chains of equal length, choose chain with greater # of branch points example #2: 2 1 CH 3 CHCHCH 2 CH 2 CH 3 CH 3 CH 2 CH 3 a hexane with 2 substituents (methyl at C-2 and ethyl at C-3) a hexane with only substituent (isopropyl at C-3) 6 5 4 3 2 1 CH 3 CHCHCH 2 CH 2 CH 3 CH 3 CH 2 CH 3 6 5 4 3 not (2) Number each carbon atom, starting at end nearer the first branch point.
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