Process for production of phosphine-borane complexes

Abstract From the Canadian patent

A process for the production of phosphine-borane complexes represented by the general formula: (see formula I) , or salts thereof: wherein R1 R2 and R3 are each , independently a hydrogen atom a halogen atom, an , optionally substituted alkyl group an optionally , substituted cycloalkyl group an optionally substituted , aryl group or an optionally substituted heterocyclic group (with the proviso that R1 and R2 together with the adjacent phosphorus atom may form a 4- to 6-membered ring) characterized by converting a compound represented by the general formula: , (see formula II) , in a solvent in the presence of a borane reagent: wherein each symbol is as defined above.