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Published June 1990 | Published
Journal Article Open

Carbon-hydrogen and carbon-carbon bond activation with highly electrophilic transition metal complexes


Highly electron deficient scandocene derivatives of the types (η^5-C_5Me_5)_2ScR, {(η^5-C_5Me_4)_2SiMe_2}ScR and {(η^5-C_5H_3CMe_3)_2SiMe_2}ScR catalyze the polymerization of ethylene, the head-to-tail dimerization of α olefins, the cyclization of α,ω dienes to methylene cycloalkanes, and the branching of 1,4 pentadienes to isoprenes. The mechanisms of the individual steps have been studied. Key steps involve sequential and reversible olefin insertion/β H elimination/β alkyl elimination, the last of which is particularly facile in these systems. [((η^5-C_5Me_4)Me_2Si(η^1-NCMe_3)(PMe_3)Sc(µ-H)]_2, catalyzes the polymerization of α olefins. Evidence is presented in support of a well defined, one component catalyst system with all scandium centers functioning alike.

Additional Information

© 1990 IUPAC. The author wishes to thank those members of his research group, past and present, whose names are indicated in the references for their enthusiastic and insightful contributions to this work. Support from the USDOE Office of Basic Energy Sciences (Grant No. DE-FG03-85ER13431) and Shell Companies Foundation is gratefully acknowledged.

Attached Files

Published - _Pure_and_Applied_Chemistry__Carbon-hydrogen_and_carbon-carbon_bond_activation_with_highly_electrophilic_transition_metal_complexes.pdf



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