Abstract:The dimethyldioxirane oxida-served. Even for these alkenes, which are proposed radical mechanism. The selection of a-methylstyrene, rruns-cyclo-prone to radical reactions, the previously tive hydroxylation of ( -)-2-phenylbutane octene, and 1 -vinyl-2,2-diphenylcycloestablished electrophilic concerted mech-by dimethyldioxirane gave only ( -)-2-propane gave, under all reaction condi-anism applies, rather than the recently phenylbutan-2-01 with complete retention tions employed, the corresponding epoxof configuration and no loss of optical ides in high yields. No radical products purity. Thus, a radical-chain oxidation is also discounted in the oxygen insertion infrom allylic oxidation, from translcis isoto hydrocarbon C-H bonds for dioximerization, or from cyclopropylcarbinyl ranes. rearrangement (radical clock) were ob-

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New platinum(IV)-coordinated carbohydrate complexes [PtMe 3 L]BF 4 (14E-21E, 22D-24D) have been prepared from the reaction of [PtMe 3 (Me 2 CO) 3 ]BF 4 (1) with a wide range of isopropylidene-protected carbohydrates L′ in acetone. These complexation reactions can be accompanied by a platinum-promoted cleavage of an isopropylidene group (14E, L′ )

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