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The title reactions were investigated experimentally and theoretically. The benzyne--tropone pair has been known to give a Diels–Alder [4+2] cycloadduct. However, in the present experiment using two sources of benzyne, many unexpected products were obtained. In particular, a zwitterion with a C–Cl bond is strikingly a major product, the structure of which was determined by the X-ray analysis. The...
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