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New rigid rods with 4σ, 6σ, 10σ, 12σ, and 16σ bond separations have been prepared from the pentacyclic diene 3 using ACE (alkene plus cyclobutene epoxide) and s-tetrazine coupling techniques and their shapes evaluated using AM1 calculations. The X-ray structure of the 6σ-rod 5 is reported.
Contrary to recent reports, baker's yeast is not required for reactions of nitrile oxides with either ethyl cinnamate or 4-vinylpyridine to give isoxazolines. β-Cyclodextrin may alter the ratio of isomers isolated from the reactions of the cinnamate but only at concentrations of reactants much lower than those reported, and this effect is most likely due to selective product complexation rather than...
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