Ketene esterification after 100 years: In the latest advance in the esterification of ketenes, Schaefer and Fu described the catalytic asymmetric conversion of 2-tolyl(ethyl)ketene (1) and diphenylacetaldehyde to give the enol ester 2 in 99 % yield and 98 % ee (see scheme).
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Thomas T. Tidwell (2005) studied this question.
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