2,3-Dimethyl-1-butene

2,3-Dimethyl-1-butene is an organic compound with the formula CH2\dC(CH3)CH(CH3)2. Like the other isomers of dimethylbutene, it is a colorless liquid. Together with 2,3-dimethyl-2-butene it can be produced by dimerization of propylene. It is a precursor to the commercial fragrance tonalide.