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We have achieved the first catalytic enantioselective synthesis of planar-chiral dithiaparacyclophanes by means of cationic rhodium(I)/(S)-BINAPHANE complex-catalyzed reactions of dithiols and 1,4-bis(bromomethyl)benzenes. The present method represents the first example of asymmetric synthesis of planar-chiral cyclophanes through catalytic enantioselective construction of the ansa chains.
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Tanaka et al. (2007) studied this question.
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