Demetalation of dicarbonyl(π-allyl)[hydridotris(pyrazolyl)borato]molybdenum complexes can be achieved via lactonization. A carboxylic acid moiety is installed via addition of methyl phenylsulfonylacetate enolate to a diene−Mo(CO) 2 Tp complex, followed by desulfonylation and hydrolysis, so that the subsequent lactonization can be effected by CO/NO + exchange or with iodine to give decomplexed products from cyclic and acyclic complexes.
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Pearson et al. (1998) studied this question.
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