[reaction: see text]. Treatment of each of the substrates 20-26, 29, and 46-48 with t-BuLi in THF, in the presence of HMPA and TMSCl, provides good-to-excellent yields of the intramolecular conjugate addition products 30-36, 37, and 49-51, respectively.
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Piers et al. (2001) studied this question.
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