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Ketene Equivalent

Generally, ketenes react with conjugate dienes by [2+2] cycloaddition so that the Diels-Alder adducts are not obtained. The reagent 1 is a ketene equivalent that undergoes the Diels-Alder reaction with a variety of dienes. For example, 1 reacts thermally with cyclopentadiene to yield a cycloadduct which upon treatment with base produces norbornenone1a). Furthermore, 1 also reacts with substitute furanes and this reaction has been used for the synthesis of sesquiterpene which is a family of biologically active natural products1b).


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