Chemo- and stereoselectivity in the ring-opening reaction of
epoxides with erbium(III) triflate are described. Epoxides can be
cleaved under neutral conditions with alcohols and thiols in the
presence of catalytic amounts of Lewis acid, affording the corresponding β-alkoxy
alcohols and β-hydroxy sulfides in high yields. In water,
epoxide ring opening occurs to produce the corresponding diols in
good yields
epoxides - Lewis acids - nucleophilic additions - ring opening - green chemistry