Patent ID: 8586796

Claim:
A process to prepare a dialkyl sulfide borane complex comprising the steps of a) bringing a dialkyl sulfide into contact with at least one base and/or at least one alkali or alkaline earth metal, wherein the base is a metal alcoholate, a metal oxide, a metal hydroxide, alkylammonium hydroxide, a metal or alkylammonium carbonate, a metal enolate, a metal amide or a metal hydride, wherein the metal is selected from the group, consisting of the alkali metals, the alkaline earth metals and the metals of the groups IIIa to VIIIa, Ib and IIb of the periodic table of elements, and b) reacting the product of step a) with an alkyl or benzyl halide, c) distilling out the dialkyl sulfide, and d) reacting the dialkyl sulfide purified according to steps a) to c) with diborane.