Enantiopure terphenyl presenting two ortho-located chiral axes having the following structural formula (I): their process of synthesis and their use as mono or bidentate ligands for asymmetric organometallic reactions, as organocatalysts, as chiral base and as generator, with metal, of isolable chiral metallic complexes for applications in asymmetric catalysis and others.

Enantiopure terphenyl presenting two ortho-located chiral axes having the following structural formula (I): their process of synthesis and their use as mono or bidentate ligands for asymmetric organometallic reactions, as organocatalysts, as chiral base and as generator, with metal, of isolable chiral metallic complexes for applications in asymmetric catalysis and others.

A method for preparing a phosphine compound using pyrophosphorous acid is provided. A phosphine oxide compound or a phosphine sulfide compound is reacted with reducing agent pyrophosphorous acid (H.sub.4P.sub.2O.sub.5) with or without impurities under stirring in the presence of a catalyst to produce a reaction product, where the catalyst is elementary halogen (X.sub.2) or halide (M.sub.XX.sub.Y). After the reaction is completed, the reaction product is subjected to water washing, extraction and purification to obtain the target phosphine compound.