Neohexene
Neohexene is the organic compound with the formula (CH3)3CCH=CH2.  It is a colorless liquid, with properties similar to other hexenes.  It is a precursor to commercial synthetic musk perfumes.

Preparation and reactions
Neohexene is prepared by ethenolysis of diisobutene, an example of a metathesis reaction:
(CH3)3C-CH=C(CH3)2  +  CH2=CH2  →   (CH3)3C-CH=CH2  +  (CH3)2C=CH2

It is a building block to synthetic musks by its reaction with p-cymene.  It is also used in the industrial preparation of terbinafine.

In the study of C-H activation, neohexene is often used as a hydrogen acceptor.