FIELD: chemistry of organophosphorus compounds. SUBSTANCE: invention relates to new achiral diphosphine ligands of biheteroaryl type. Invention describes new achiral diphosphine ligand of the formula: (Ia) 
and describes also diphosphine complexes of transient metals of the formulas (IIa) 
and (IIIa) 
and method for synthesis of compound of the formula (Ia). Invention provides preparing new compounds and diphosphine complexes based on thereof that can be used in the following catalytic processes: amination, cross-coupling, hydroformylation, hydrocyanidation, hydrogenation, allyl alkylation, polymerization of α-olefins and others reactions resulting to formation linkages C-C and C-N. EFFECT: improved preparing method, valuable chemical properties of ligand. 3 cl, 2 tbl, 6 ex
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