Enantioselective Catalysis 113: New Menthylphosphane Ligands Differing in Steric and Electronic Properties
- 1 January 1998
- journal article
- research article
- Published by Georg Thieme Verlag KG in Synthesis
- Vol. 1998 (01) , 45-55
- https://doi.org/10.1055/s-1998-1996
Abstract
A concept for bisphosphane ligands was developed, in which chirality is derived from the optically active (1R,3R,4S)-menthyl substituents in PMen2 groups and the backbone between the phosphorus units is varied (o-phenylene, 2,2′-biphenylene, 1,1′-ferrocenediyl); one of the two PMen2 groups was also replaced by a PPh2 unit. The synthesis and characterisation of seven new menthylphosphanes is described. Emphasis is put on the NMR assignment of the menthyl protons by two-dimensional methods and 13C-1H shift correlation. The ligands have been used in Rh and Ni complexes in several model reactions of enantioselective catalysis giving optical inductions in the low to middle range.Keywords
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