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(+)-(1S,4R)-4-hydroxy-1-phenyl-2-phospholene-1-oxide (+)-(4a) was obtained by optical resolution of the corresponding ω-camphanates 5a and converted into (+)-(S)-4-oxo-1-phenyl-2-phospholene-1-oxide (+)-(1a). The absolute stereochemistry of (+)-(4a) was determined by a single-crystal X-ray analysis.
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Bodalski et al. (1982) studied this question.
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