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Dieckmann-type cyclization reactions of various dicarboxylic acid derivatives were readily promoted by employing Lewis acids such as AlCl3, MgBr2, MgCl2, and Sn(OSO2CF3)2 in the presence of Et3N or N-ethylpiperidine. The cyclization reactions of half thiol diesters under the AlCl3-Et3N conditions exhibited different chemoselectivity from the cyclization under the basic conditions.
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Tamai et al. (1995) studied this question.
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