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Intramolecular 1,3-dipolar cycloadditions of two N-alkenylnitrones are studied by means of density functional theory calculations. Cycloaddition of an acyclic 4-hexenylnitrone led to the expected isoxazolidine in 46% yield, but a 4-cycloheptenylnitrone did not react. Calculations of the transition states for cycloaddition indicate that although the cycloheptenyl nitrone has a more favorable activation...
The reductive dehalogenation of organohalides by tris(trimethylsilyl)methane has been re-investigated. Contrary to claims made in a recent publication (Tetrahedron Lett. 2006, 47, 5163–5165), (TMS) 3 CH does not reduce organohalides. In competition experiments between (TMS) 3 CH and the poor chain mediator Et 3 SiH, the latter performed the reduction. Computational investigations...
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