Right or Left - Enantioselective Catalysis. New Ni, Pd and Pt Phosphane Complexes with the Chiral 9-Phenyldeltacyclanyl Substituent

Author: Brunner H.

Source: Current Organic Chemistry, Volume 6, Number 5, April 2002 , pp. 441-451(11)

Publisher: Bentham Science Publishers

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Abstract:

After introducing chirality with the winding columns of baroque altars and snail shells, the enantioselective hydrogenation of dehydroamino acids is described. Then, the enantioselective homo Diels-Alder reaction of norbornadiene with phenylacetylene is presented, which leads to 8-phenyldeltacyclene in almost enantiomerically pure form. Its reaction with 1,2-bisphosphanylbenzene affords P,P,P'-tris(9-phenyldeltacyclan-8-yl)-1,2-bisphosphanylbenzene, a chelate ligand with 3 chiral deltacyclanyl substituents and a PH bond, comprising 24 asymmetric carbon atoms of a given configuration and a stereogenic secondary phosphorus atom. This chelate ligand forms mononuclear, phosphido-bridged dinuclear and - most unusual - trinuclear Ni, Pd and Pt complexes. The trinuclear complexes consisting of three joint square planar units are unique in Ni, Pd and Pt chemistry.

Keywords: pt phosphane complexes; chiral 9-phenyldeltacyclanyl substituent

Language: English

Document Type: Review article

DOI: 10.2174/1385272024604943

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