Preparation and molecular structures of benzyl- and phenylacetylcobalt carbonyls
摘要:
The benzyl-type cobalt carbonyl complexes (para-(BuC6H4CH2)-Bu-t)Co(CO)(3)PPh3 (4) and [para-ClC6H4CH2C(O)]Co(CO)(3)PPh3 (5) were prepared and characterized by analyses, spectra and X-ray single-crystal diffraction. The overall structures both of the alkylcobalt-type 4 and the acylcobalt-type 5 display trigonal bipyramidal geometry, with the two noncarbonyl ligands in the two axial positions. The relevance of the stereochemistry of complexes 4 and 5 to the supposed mechanism of the CO insertion/deinsertion on cobalt is discussed. (C) 1999 Elsevier Science S.A. All rights reserved.