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Shabbirali S. Taj and Raghavan Soman. Asymmetric methylene transfer reactions I: Asymmetric synthesis of oxiranes from carbonyl compounds by methylene transfer reaction using chiral S-methyl-S-neomenthyl-N-tosyl sulfoximines// Tetrahedron: Asymmetry, Volume 5, Issue 8, August 1994, Pages 1513-1518.
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http://dx.doi.org/10.1016/0957-4166(94)80120-7