2-Pyrazolines and 2-isoxazolines are prepared by the reaction of araldehyde hydrazones and araldoximes with bifunctional olefins in the presence of chloramine-T, which also functions as a reagent for aromatization of the former.
The reaction between vinyl chloride and aroyl/arylsulfonyl chloride under FriedelÐCraftÕs reaction conditions was the basis for the synthesis of unsaturated oxo sulfones and bissulfones.
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An efficient ring closing metathesis (RCM) reaction based approach was developed for the spiroannulation of cyclopentanes and cyclohexanes and its utility demonstrated in the formal synthesis of the spirosesquiterpenes acorones.
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