1,2-Bis(dichlorophosphino)benzene

1,2-Bis(dichlorophosphino)benzene is an organophosphorus compound with the formula C6H4(PCl2)2. This viscous colorless liquid is a precursor to chelating diphosphines of the type C6H4(PR2)2. It is prepared from 1,2-dibromobenzene by sequential lithiation followed by treatment with (Et2N)2PCl (Et = ethyl), which affords C6H4[P(NEt2)2]2. This species is finally cleaved with hydrogen chloride:
 * C6H4[P(NEt2)2]2 + 8 HCl → C6H4(PCl2)2 + 4 Et2NH2Cl

Related compounds

 * 1,2-Bis(dichlorophosphino)ethane