Lecture 22(chapter 20)

Lecture 22(chapter 20) - Chapter 20 Amines Amines are...

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Chapter 20 Amines Amines are organic bases . They are found widely in nature. Nomenclature Amines are classified according to the number of R groups around the nitrogen. RNH 2 : R 2 NH R 3 N primary 1 o -amine secondary 2 o -amine tertiary 3 o -amine The R groups may be alkyl or aryl. Alkyl Group Names Simple amines are named by naming the alkyl group or groups attached to the nitrogen followed by "amine." The prefixes "di" and "tri" are used as needed. Systematic Names The systematic name is derived from the alkane name by dropping the "e" and adding the suffix "amine."
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Examples primary amines CH 3 NH 2 NH 2 CH 3 CNH 2 CH 3 CH 3 methylamine (methanamine) cyclohexylamine (cyclohexanamine) tert-butylamine (2-methyl-2-propanamine) secondary amines In the systematic name, the second R group is indicated as "N-," followed by the systematic amine name of the first group. ethylmethylamine (N-methylethanamine) diethylamine (N-ethylethanamine) tertiary amines (CH 3 ) 3 N N(CH 3 ) 2 trimethylamine (N,N-dimethylmethanamine) cyclopentyldimethylamine (N,N-dimethylcyclopentanamine) CH 3 NHCH 2 CH 3 CH 3 CH 2 NHCH 2 CH 3
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The "Amino" Group When -NH 2 is a substitutent, it is named as an "amino" group in the systematic name. Arylamines Aromatic amines are often named as derivatives of aniline .
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This note was uploaded on 01/20/2012 for the course CHEM 325BL at USC.

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Lecture 22(chapter 20) - Chapter 20 Amines Amines are...

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