[reaction: see text] Fumarate- and acrylate-substituted oxazolidinones undergo tandem radical reaction to form dienes in moderate to good yields. The resulting dienes provide cyclooctenes in moderate to good yields after ring-closing metathesis (RCM). The role of the carbon backbone substituents and other variables in the efficiency of the eight-membered ring formation is discussed.

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Cycloalkylphenyl derivativesCycloalkylphenyl derivatives Q 0760 Reactions of Arylhalocarbenes with Vinyl Isocyanates. -The thermolysis of diazaindans in the presence of 1-cyclohexene-1-isocyanate (II) is investigated. Mostly the [2 + 1] cycloadducts (IV) and (VII) are obtained in favor of [4 + 1] adducts [cf. (VI)]. -(RIGBY*, J. H.; AASMUL, M.; Heterocycles 62 (2004) 1, 143-147; Dep. Chem., Wayne State Univ., Detroit, MI 48202, USA; Eng.) -Mais 19-088