NEW PERSPECTIVES IN THE TAILORING OF HETERO BIMETALLIC AND TRIMETALLIC ALKOXIDE DERIVATIVES

Metal alkoxides containing more than one sort of metallic element are predominantly known in the field of heterobimetallic derivatives. In o rder to pass to heterotrimetallic homoleptic alkoxides bimetallic alko xides have to be prepared which are at the same time heterobimetallic and heteroleptic. They serve as starting materials in salt elimination reactions leading to heterotrimetallic homoleptic alkoxides. The stru ctural entity serving as a building block in these reactions must be k inetically stable in order to survive in the synthetic procedures. Bes ides heterotermetallic alkoxides, heterobimetallic alkoxides with hali des and cyclopentadienyl as ancillary ligands and transition metal com plexes of new mixed-metal alkoxy derivatives are presented. Besides th e syntheses and the structural characterization reactivity, spectral a spects in view of dynamic or static structures and applications of het ero(bi- and tri-)metallic alkoxides are discussed. (C) 1997 Elsevier S cience Ltd, All rights reserved.