Advices For Studying Organic Chemistry

1) 1-Methylethyl is the systematic name; isopropyl is a common name.

2) Numbering always begins at the point where the group is attached to the main

chain.

2. Four-Carbon Groups

CH 3 CH 2 CH 2 CH 3

CH 3 CH 2 CH 2 CH 2

H 3 CH 2 CCH

CH 3

Butyl group

Butane 1-Methylpropyl or sec-butyl group

1,1-Dimethylethyl or tert-butyl group

CH 3 CHCH 3

CH 3

CH 3 CHCH 2

CH 3

2-Methylpropyl or isobutyl group

CH 3 C

CH 3

CH 3

Isobutane

1) 4 alkyl groups: 2 derived from butane; 2 derived from isobutane.

3. Examples:

4-(1-Methylethyl)heptane or 4-isopropylheptane

CH

CH 3 CH 2 CH 2 CHCH 2 CH 2 CH 3

H 3 C

CH 3

4-(1,1-Dimethylethyl)octane or 4-tert-butyloctane

C

CH 3 CH 2 CH 2 CHCH 2 CH 2 CH 2 CH 3

H 3 C

CH 3

CH 3

H 3 CCCH 2

CH 3

2,2-Dimethylpropyl or neopentyl group

CH 3