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2005
Epoxidation
O 0218
24- 052
Highly Enantioselective Epoxidation of 2,4-Diarylenones by Using Dimeric
Cinchona Phase-Transfer Catalysts: Enhancement of Enantioselectivity by Surfactants. — Various 2,4-diarylenones undergo enantioselective catalytic epoxidation
under very mild conditions. Best results are achieved using Span 20 as surfactant to
increase both reaction rate and enantioselectivity. Cinchona alkaloid derived dimeric
quaternary ammonium salts are used as phase-transfer catalysts. — (JEW*, S.-S.; et
al.; Angew. Chem., Int. Ed. 44 (2005) 9, 1383-1385; Res. Inst. Pharm. Sci., Coll.
Pharm., Seoul Natl. Univ., Kwanak, Seoul 151-742, S. Korea; Eng.) — S. Adam
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