Waste not, want not: A mechanistic study of the ruthenium-catalyzed haloalkylation of titanium enolates led to the development of a process that is catalytic in both metals: titanium and ruthenium (see scheme; Bn=benzyl, PMP=1,2,2,6,6-pentamethylpiperidine). Catalytic turnover was observed in the formation of the titanium enolates from N-acyl oxazolidinones, and insight was gained into the inhibitory effect of the amine base.
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Gu et al. (2011) studied this question.
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