Abstract
Reactions of Fischer-type carbyne tungsten complexes X(CO) n WCPh (X = Cl, Br, I, n = 4; X = Cp, n = 2) with reduced Phillips catalyst, a chromium(II) compound surface-bound to silica, yield heterogeneous bimetallic metathesis catalysts for alkenes. The reactions probably proceed via a [2 + 1] cycloaddition of the WC carbyne bond with the chromium(II) atoms to give dimetallacyclopropene derivatives. The bimetallic catalysts formed by reaction with the halogeno substituted carbyne complexes are very active alkene metathesis catalysts, as demonstrated by the reaction with 1-octene. The original polymerisation activity towards 1-alkenes of the surface-bound chromium(II) atoms disappeared after reaction with carbyne complexes.
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