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Easy access to axially chiral phthalides that bear one or two oxymethylene functionalities is provided by an enantioselective cross alkyne cyclotrimerization in the presence of the cationic complex [RhI{(S)-H8-binap}]+. The axial chirality is introduced during the formation of the benzene ring with high enantioselectivity.
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Tanaka et al. (2004) studied this question.
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