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- [5] (S)-(+)-1,5-DIMETHYL-4-PHENYL-1,5-DIHYDRO-2H-PYRROL-2-ONE AND (R)-(-)-1,5-DIMETHYL-4-PHENYL-1,5-DIHYDRO-2H-PYRROL-2-ONE BY CARBENE RING CONTRACTION AND DECARBOXYLATION OF (2R,3S)(-)-6-DIAZO-3,4-DIMETHYL-2-PHENYLOXAZEPANE-5,7-DIONE AND (2S,3R)-(+)-6-DIAZO-3,4-DIMETHYL-2-PHENYLOXAZEPANE-5,7-DIONE ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1995, 34 (01): : 78 - 79