Metal complexes based on monosaccharide bicyclophosphites as new availablechiral coordination systems

1,2-O-Alkylidene-alpha-D-glucofuranose 3,5,6-bicyclophosphites form optical ly active complexes with simple Cu(I), Cr(0), Mo(0) and Pt(II) derivatives. All these metals are coordinated to the phosphorus atom. It was shown that copper complexes in a solution are in rapid exchange with free ligands. De pending on the reaction conditions, chromium and molybdenum can add one or two ligand molecules. Cis-trans isomerization is typical for the phosphite complexes of platinum in the solution. The structural parameters of some sy nthesised complexes were compared with those of their nearest analogues on the basis of X-ray diffraction analysis. Relatively slight deformation of l igands coordinated was inferred. Most of the metal complexes obtained are q uite stable and can be used in experimental practice. (C) 1999 Elsevier Sci ence S.A. All rights reserved.