Pyrylium Salt Sensitized Photochemical Deprotections of Dithioacetals and Ketals
Photoreactions of various dithioacetals and ketals using tris(p-chlorophenyl)pyrylium perchlorate as a sensitizer were studied.Irradiation (λ>360 nm) of dichloromethane solutions containing dithioacetals or ketals and pyrylium salt afforded the corresponding carbonyl compounds in good to excellent yields in the presence of molecular oxygen.
Lithium keten thioacetalides. Factors influencing α- versus γ-alkylation
Alkylation of the lithium salt of the vinyl-1,3-dithian (2; R = CH 3) occurred exclusively at the α-carbon. However both α- and γ-alkylation was observed with the substrate (2; R = C 6H5). A systematic investigation reveal
Murphy, William S.,Wattanasin, Sompong
p. 2678 - 2682
(2007/10/02)
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