Dichlorobutane
Dichlorobutane is a chloroalkane with the molecular formula C4H8Cl2. There are many substances encompassed under this general name (9 structural isomers, 5 of which have optical isomers). They are obtained by common synthesis methods for chloroalkanes (such as free radical chlorination of chlorobutane or nucleophilic substitution of butanediols, depending on the desired isomer).