Illustrated Glossary of Organic Chemistry

Isobutyl (isobutyl group): A portion of a molecular structure which is equivalent to isobutane (2-methylpropane) minus one hydrogen atom from carbon one.

Isobutane (2-methylpropane)

Isobutyl group
Isobutane
(2-methylpropane)

Isobutyl group

Isobutyl group