Abstract
The reactions of diphenyl(3,5-dimethylpyrazolyl)- phosphine (LL) with [(nbd)M(CO) 4] (nbd = norbornadiene, M = Mo, W) and with [(CH 3CN) 2W(CO) 4] under mild conditions proceed in a stepwise fashion to yield a mixture of products in equilibrium. The four-membered metallocyclic species (LL)M(CO) 4 and the phosphorus-coordinated complex cis-[LL) 2 M(CO) 4] are formed in competition, being favoured by 1:1 and >2:1 reaction stoichiometries respectively.
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