Novel [4+2] Cycloaddition between Thiobenzophenone and Aryl-Substituted Alkenes via Photoinduced Electron Transfer

JUAN E. ARGÜELLO; RAÚL PÉREZ-RUIZ; MIGUEL A. MIRANDA

ORGANIC LETTERS

Año: 2007 p. 3587 - 3590

1523-7060

The [4 + 2] cycloaddition products between thiobenzophenone (1) and arylalkenes (2) were obtained in the presence of (thia)pyrylium salts (sensitizer ) 3 or 4) as electron transfer photosensitizers. Although both radical cations 1¥+ and 2¥+ are generated, only the former is involved in the process.+ 2] cycloaddition products between thiobenzophenone (1) and arylalkenes (2) were obtained in the presence of (thia)pyrylium salts (sensitizer ) 3 or 4) as electron transfer photosensitizers. Although both radical cations 1¥+ and 2¥+ are generated, only the former is involved in the process.