Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 10 (October 2004)

metal-organic compounds

Acta Cryst. (2004). C60, m532-m536 [ doi:10.1107/S0108270104020773 ]

(R,R)-Tricarbonyl{⁶-1-(diphenylphosphino)-2-[1-(diphenylphosphino)ethyl]benzene}chromium(0), (R,R)-tricarbonyl-1³C-{-1(⁶):2²P,P'-1-(diphenylphosphino)-2-[1-(diphenylphosphino)ethyl]benzene}[2(⁴)-norbornadiene]chromium(0)rhodium(I) tetrafluoroborate methanol 0.75-solvate and (R,R)-tricarbonyl-1³C-{-1(⁶):2²P,P'-1-(diphenylphosphino)-2-[1-(diphenylphosphino)ethyl]benzene}[2(⁴)-(Z,Z)-cycloocta-1,5-diene]chromium(0)rhodium(I) tetrafluoroborate methanol 1.5-solvate

W. Braun, B. Calmuschi, H.-J. Drexler, U. Englert, D. Heller and A. Salzer

Abstract: The title mononuclear chromium compound, [Cr(C₃₂H₂₈P₂)(CO)₃], (I), and its rhodium complexes [CrRh(C₇H₈)(C₃₂H₂₈P₂)(CO)₃]BF₄·0.75CH₄O, (II), and [CrRh(C₈H₁₂)(C₃₂H₂₈P₂)(CO)₃]BF₄·1.5CH₄O, (III), prepared as a ligand and precatalysts, respectively, for application in asymmetric homogeneous hydrogenation, have been studied by single-crystal X-ray diffraction. The structures of the free and complexed ligand are compared. It was found that the backbone of the ligand remains rigid on coordination, while only minor conformational changes of its side chains are observed. Both elements of central and planar chirality seem to build a well defined chiral environment for stereoselective catalysis.

Formula: [Cr(C₃₂H₂₈P₂)(CO)₃], [CrRh(C₇H₈)(C₃₂H₂₈P₂)(CO)₃]BF₄·0.75CH₄O and [CrRh(C₈H₁₂)(C₃₂H₂₈P₂)(CO)₃]BF₄·1.5CH₄O


	Structure factor file (CIF format) (272.8 kbytes) Contains datablock I

	Structure factor file (CIF format) (662.6 kbytes) Contains datablock II

	Structure factor file (CIF format) (315.9 kbytes) Contains datablock III

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