Strategies in the cyclopentadienyl chemistry of p-block elements
P. Jutzi
University of Bielefeld, Department of Chemistry,
Universitätsstr. 25,
D-33615 Bielefeld, Germany
Abstract: Synthetic strategies in the cyclopentadienyl
(Cp) chemistry of the groups 13–15 elements, are based on the
following phenomena: (1) low barriers for haptotropic and dyotropic
shifts, for sigmatropic rearrangements, and for other types of Cp migration;
(2) stabilization of elements in their low-oxidation state by p-complexation;
(3) tuning of steric andelectronic effects by suitable ring substituents;
and (4) easy homolytic and heterolytic cleavage of El-C(Cp) bonds. These
strategies are applied to: (a) the formation of a Si2Me4
doubly bridged dicyclopentadienyl cobalt complex, (b) the chemistry
of half-sandwich [Me5C5Ga] and sandwich [(Me5C5)2Si]
complexes, (c) the formation of P6, (d) the deposition of
Al, Ga, Si, Ge, and As from respective Cp-El precursor molecules, and
(d) the “dynamic covalent chemistry” in ferrocenylgallium(III)
compounds.
*Plenary lecture presented at the XXth International
Conference on Organometallic Chemistry (ICOMC), Corfu, Greece, 7-12
July 2002. Other presentations are published in this issue,
pp. 421-494.
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