Abstract
The elimination of methane from Cp/sub 2/W(H)CH/sub 3/ (Cp-cyclopentadiene) was investigated using thermolysis and acetonitrile-toluene mixtures as the matrix. With the use of deuterium labeled intermediates, an intramolecular methane elimination was found in dilute solutions while the process appears to be intermolecular at higher concentrations. Results for /sup 1/H, /sup 2/H, /sup 13/C NMR were used to calculate the final mole fractions of 16 isotopically labeled species occurring in mixtures of Cp/sub 2/W(H)/sup 13/ CH/sub 3/ Cp/sub 2/W(H)CD/sub 3/ mixtures. Analysis of results shows that the tungsten hydride in Cp/sub 2/W(H)CH/sub 3/ is able to exchange with the C-H bonds in the methyl ligand of another molecule of the same material, at a rate which competes well with intramolecular methane except in a very dilute solution. The compounds discussed are among the first hydrides for which intermolecular exchange with an aliphatic ligand has been reported. 16 references.
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