The ADMET chemistry of 1,1-disubstituted, 1,2-disubstituted, and trisubstituted alkenes has been examined in the presence of the Lewis acid free metathesis catalysts M(CHR')(NAr)(OR)2 where M = W (1) or Mo (2), Ar = 2,6-(¿-Pr)2CeH3, R' = CMe2Ph, and R = CMeCCFab, and the specific interaction of each olefin with the catalysts has been monitored by NMR.Successful metathesis depends on both the substitution pattern of the olefin and the catalyst employed.The molybdenum-based catalyst promotes the metathesis of 1,1-disubstituted alkenes but only through cross-metathesis with internal olefins which are no greater than disubstituted.The tungsten-based catalyst is unable to promote metathesis chemistry with these substituted olefins.the reaction to completion.Since the ADMET mechanism involves the bimolecular condensation of two olefins without the benefit of
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Konzelman et al. (1995) studied this question.