Novel copper complexes of chiral diphosphines: preparation, structure, and use to form rhodium complex catalysts for chiral hydrogenations

…, RC Sun, S Zawoiski, D Valentine Jr

Index: Townsend, John M.; Blount, John F.; Sun, Ruen Chu; Zawoiski, Sonja; Valentine, Donald Journal of Organic Chemistry, 1980 , vol. 45, # 15 p. 2995 - 2999

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Citation Number: 43

Abstract

Treatment of chiral diphosphines 5a-c and 13 (“DIOP”, aryl derivatives and related substances) with CuCl in boiling ethanol gave complexes having the composition [Cu (diphosphine)(C1) 1,, 6a-c and 11. Crystallizations of 6a-c from crude 7&80% pure 5a-c and decomposition of the complexes by ammonia gave the pure diphosphines. Ligand exchange between 6a-c and [Rh (diolefin)(Cl)], in methanol at 23 “C was rapid and ...