2,3-Dimethylbutane, also known as diisopropyl, is an isomer of hexane. It has the chemical formula (CH3)2CHCH(CH3)2 It is a colorless liquid which boils at 57.9 °C.
2,2-Dimethylbutane, trivially known as neohexane, is an organic compound with formula C6H14 or (H3C-)3-C-CH2-CH3. It is therefore an alkane, indeed the most compact and branched of the hexane isomers — the only one with a quaternary carbon and a butane (C4) backbone. It can be synthesised by the hydroisomerisation of 2,3-dimethylbutane using an acid catalyst.