Alkoxy(aryl) adamantylidenes react with chromium(VI) or molybenum(VI) oxide diperoxides in CHCl3 under argon yielding the corresponding 1,2-dioxetanes and/or carbonyl products derived from the fragmentation of the dioxetanes. The reaction most likely proceeds via preliminary epoxidation of the unsaturaled substrates.
Thermally stable 1,2-dioxetanes have been synthesized by 9,10-dicyano-anthracene (DCA)-sensitized photooxygenation of alkoxy (aryl)-methylidene adamantanes. The reactions most likely proceed via a chain electron-transferprocess.
Electron-transfer reactions on enol-ethers induced by aminium salts syntheses of 1,2-dioxetanes and/or ketones
作者:Luigi Lopez、Luigino Troisi
DOI:10.1016/s0040-4020(01)88269-7
日期:1992.1
Thermally stable 4-alkoxy-4-(aryl)spiro [1,2-dioxetane-3,2'-adamantanes] 2a-e have been synthesized by reaction of oxygen-saturated methylene chloride solutions of alkoxy(aryl) methylidene adamantanes 1a-e with catalytic amounts of one electron oxidizing agents as tris-p-bromophenyl ammoniumyl and/or tris-o,p-dibromophenyl ammoniumyl hexachloroantimonates (reagents A,B). Similar reactions carried out on 1a-d, under argon-atmosphere, yield adamantyl-arylketones 5a-c together with the corresponding alcohols 6a-b. Both processes most likely involve the formation of radical cation intermediates (1+), leading to the reaction products through chain electron-transfer mechanisms.
Electron-transfer induced conversion of enol-ethers into ketones