Illustrated Glossary of Organic Chemistry

Butyl group: (1) Any saturated, acyclic alkyl group consisting of four carbon atoms, derived from butane or 2-methylpropane.

Butyl Alcohols  The butyl groups are shown in red







1-Butanol
(n-butyl group)
  
2-Methyl-1-propanol
(isobutyl group)
  
2-Butanol
(sec-butyl group)
  
2-Methyl-2-propanol
(tert-butyl group)

(2) The alkyl group -CH2CH2CH2CH3 derived from n-butane. Also called the n-butyl group.