Relationships among Allenyl, Propargyl, and Allenylidene Complexes

RELATIONSHIPS AMONG ALLENYL, PROPARGYL, AND ALLENYLIDENE COMPLEXES 

The allenylidene [M=C=C=CR R ] unit represents a member of the class of carbon-rich unsaturated hydrocarbyl fragments, and it is capable of binding one to four metal centers. In sharp contrast to the rapidly developing chemistry of mononuclear allenylidene complexes, the scarcity of bi- and polynuclear species of this type has hindered the development of an extensive chemistry. Selected examples from the allenylidene literature are cited in this article owing to the close structural analogy with allenyl derivatives. The reader is referred to a review article by Bruce covering the relevant literature of this metallacumulene up to 1989 (la). 

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Relationships among Allenyl, Propargyl, and Allenylidene Complexes. 41... 

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