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Vitamin E synthesis: Covalently linked dipeptides serve as readily removable and recyclable chiral auxiliaries in the diastereoselective cyclization of phytylhydroquinones. Depending on the chirality of the handle, (2R)- or (2S)-α-tocopherol (vitamin E) can be produced with a diastereomeric excess of up to 80 % (see scheme).
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Grütter et al. (2006) studied this question.
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