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(4S)-4,5-O-Isopropylidenepent-(2Z)-enoate (1) has been prepared on a multigram scale from 1,2 : 5,6-di-O-isopropylidene-D-mannitol (4) in a one pot, two step sequence with improved selectivity (16 : 1 Z : E) and yield (71% Z) over previous literature procedures.
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Koenig et al. (2002) studied this question.
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