Polyfunctional Electrophilic Multihapto-Organometallics for Organic Synthesis

Polyfunctional Electrophilic Multihapto-Organometallics for Organic Synthesis 

The attachment of a transition metal to an unsaturated hydrocarbon ligand transforms the reactivity properties of the ligand. Whereas the classic chemistry of alkenes and arenes is that of electrophilic addition and substitution reactions, the classic reactivity of multihapto-complexes is their reactions with nucleophiles. Such complexes need not be cationic to be good electrophiles, but it helps, and not surprisingly, the most powerful electrophilic multihapto-complexes have positive charge stabilized by the metal. 

The intention of this chapter is to set out the patterns of reactivity of electrophilic multihapto-complexes with nucleophiles, with particular regard to the effects of substituents on the haptyl portion of the ligand. Addition of a nucleophile to an electrophilic multihapto-complex reduces hapticity by 1. Thus a cationic electrophile [ ] is converted into a neutral product when, for example, a 

Copyright 2005 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim ISBN 3-527-31131-9 

Classes of Nudeophile Addition Pathways to Multihapto-Complexes 

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