Common Name: 1-Bromo-3-methyl-2-butene Other Names: 3,3-Dimethylallyl bromide | 3,3-Dimethylallyl bromide | γ-Methylcrotyl bromide | 1-Bromo-3-methylbutene | 3-Methyl-2-butenyl bromide | 4-Bromo-2-methyl-2-butene | Isopentenyl bromide English Name: 3,3-Dimethylallyl bromide CAS Number: 870-63-3 EINECS: 212-799-5 Molecular Formula: C5H9Br Molecular Weight: 149.029 Density: 1.3±0.1 g/cm3 Boiling Point: 132.6±0.0 °C Flash Point: 32.8±0.0 °C Appearance: Pale brown liquid with a strong pungent odor Solubility: Soluble in ethanol and benzene; insoluble in water Uses: 1. Used as an intermediate in pesticides and pharmaceuticals. 2. In organic synthesis, it provides the 3,3-dimethylallyl group or isoprenyl group for natural products or base-modified pyrimidine nucleosides.