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A general, straightforward and odourless ring-opening reaction allows the preparation of β-hydroxy sulfides from in situ generated S-alkylisothiouronium salts in urea-choline chloridebased deep eutectic solvent (DES). In addition, reaction of epoxides with thiourea in DES yields the corresponding thiiranes.

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An Atom-Economic and Odorless Thia-Michael Addition in a Deep Eutectic Solvent. -The use of a deep eutectic ionic liquid based on urea and choline chloride as the solvent and catalyst is reported for the title reaction. The process involves the formation of S-alkylthiourea intermediates from alkyl halides and thiourea followed by coupling with activated olefins. -(AZIZI*, N.; YADOLLAHY, Z.; RAHIMZADEH-OSKOOEE, A.; Tetrahedron Lett. 55 (2014) 10, 1722-1725, http://dx.