Zeolite molecular sieve 4Å: a reusable catalyst for fast and efficient conversion of epoxides to thiiranes with thiourea

…, B Zeynizadeh, MM Baradarani

Index: Eisavi, Ronak; Zeynizadeh, Behzad; Baradarani, Mohammad Mehdi Phosphorus, Sulfur and Silicon and the Related Elements, 2011 , vol. 186, # 9 p. 1902 - 1909

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Citation Number: 7

Abstract

Abstract Various epoxides are readily converted to their corresponding thiiranes by thiourea/zeolite molecular sieve 4Å system in refluxing MeOH. All reactions were carried out within 12–25 min to give thiiranes in 80%–99% yields. The catalyst saves its catalytic activity for several times at this transformation. Stereospecific conversion of (R)-(+)-styrene oxide to (S)-(+)-styrene episulfide was achieved by this combination system. GRAPHICAL ...