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Highly enantioselective cyanoformylation of aldehydes catalyzed by VV chiral salen complex by using ethyl cyanoformate as a source of cyanide was accomplished in the presence of several cocatalysts. Excellent yields and ee values for the resulting cyanohydrin carbonates were achieved when imidazole was used as a cocatalyst at –20 °C. The ee value of the cyanohydrin carbonate of 2‐naphthaldehyde was further improved to >99 % by recrystallization. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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Khan et al. (2008) studied this question.
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