... Tetrahedron Letters. Volume 44, Issue 3, 13 January 2003, Pages 591–594. ... of oxiranes to thiiranes, 24., and deprotection of 1,1-diacetates, 25 alcoholysis, hydrolysis and acetolysis of epoxides, 26 deprotection of silyl ethers, 27 conversion of epoxides to 1,3-dioxolanes, 28 ...