Chiral diphospholes. III. Improved synthesis and coordination chemistry of (R,R)-DIPPOP

Article abstract of DOI:10.1016/0022-328X(93)83419-V

An improved, 90percent yield synthesis of the chiral diphosphole, (R,R)-DIPPOP (1) is reported.The reactions of 1 with nickel, palladium, platinum and rhodium complexes are examined. 1 does not react with NiCl2.With PdCl2 and PtCl2, it forms various cis and trans diphosphine-bridged cyclooligomers of undetermined ring size.The rhodium complexes BF4, and 2 are good precursors for the synthesis of >BF4, (8), >, (9), and 2(μ-P,P'-(R,R)-DIPPOP>, (10), which are fully characterized by multinuclear NMR spectroscopy.