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1997 ring closure reactions ring closure reactions O 0130 -084PET-Oxidative Cyclization of Unsaturated Silyl Enol Ethers. Regioselective Control by Solvent Effects.-Oxidative cyclization of silyl enol ethers (I), (V), and (VII) is achieved in the presence of the electron-transfer sensitizer 9,10-dicyanoanthracene. In the absence of alcohols the reaction of (I) predominantly occurs via silyloxy radical cations as reactive intermediates leading to (II). The formation of the regioisomers (III) and (IV) via α-keto radicals can also be controlled by the addition of alcohols. -(HINTZ, S.; FROEHLICH, R.; MATTAY, J.; Tetrahedron Lett. 37 (1996) 41, 7349-7352; Inst. Org.

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