Redesign of a Pyrylium Photoredox Catalyst and Its Application to the Generation of Carbonyl Ylides
作者:Edwin Alfonzo、Felix Steven Alfonso、Aaron B. Beeler
DOI:10.1021/acs.orglett.7b01222
日期:2017.6.2
We report the exploration into photoredox generation of carbonylylides from benzylic epoxides using newly designed 4-mesityl-2,6-diphenylpyrylium tetrafluoroborate (MDPT) and 4-mesityl-2,6-di-p-tolylpyrylium tetrafluoroborate (MD(p-tolyl)PT) catalysts. These catalysts are excited at visible wavelengths, are highly robust, and exhibit some of the highest oxidation potentials reported. Their utility
The photochemistry of 2,3-bis(p-methoxyphenyl)oxirane: trapping of a C–C cleaved intermediate in an electron-transfer sensitised process
作者:Paul Clawson、Patricia M. Lunn、Donald A. Whiting
DOI:10.1039/c39840000134
日期:——
2,3-Bis(p-methoxyphenyl)oxirane (6) rearranges, with C–O cleavage, to the carbonyl compounds (8) and (9) on irradiation, direct or triplet sensitised, and thermally: in contrast C–C cleavage is observed with dicyanoanthracene as electron-transfersensitiser, and the resulting intermediate can be trapped by dipolarophiles in synthetically useful reactions.