Abstract
The reactions of fulvenes with several mesoionic compounds have been investigated. The mesoionic dithiolones (7) gave regio- and stereo-selective [4π+ 2π] cycloadducts (11)–(13) across the endocyclic double bonds of fulvenes, but no periselectivity was observed with unsymmetrical fulvenes. Several other mesoionic ring systems failed to react or gave complex reaction products.
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