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A possible explanation for the formation of two diastereomers 4ag and 4ag ′ is as follows. At rt, the reaction of 1a and 2g affords E -dienyne 3ag as a predominant stereoisomer. At 80 C, equilibration between E -dienyne 3ag and Z -dienyne 3ag ′ occurs in the presence of the cationic Rh(I) catalyst. (For the cationic Rh(I) complex-catalyzed E / Z isomerization of enones, see: Tanaka, K.; Shoji, T.; Hirano, M. Eur. J. Org. Chem. 2007, 2687.) Although E -dienyne 3ag may be thermodynamically more stable, the cyclization of 3ag may be slow as a result of the steric interaction between the methyl and aryloxyvinyl groups in intermediate F. In contrast, the cyclization of thermodynamically less stable Z -dienyne 3ag ′ may be fast as a result of the formation of less sterically demanding intermediate F ′. The formation of 4ag and 4ag ′ through different rhodacycles F and F ′, respectively, is consistent with their different ee values
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