Page 24 - Pharm.Org.Chem-I 02-06-05-101

H3C
H3C C X

H3C

tert-butyl

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1) C1-C4 gases, C5-C17 liquids, C18- solids

2) Branched isomers have lower boiling points than straight
chain isomers

H2 H3C CH3
H3C C C C CH3 CH CH2 H3C C CH3

H2 H2 H3C CH3 CH3
n-pentane
isopentane neopentane
B.p. = 36 B.p. = 28 B.p. = 9.5

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