Abstract
Cycloaddition of a mesoionic dithiolone or thiazolone (1) with dimethyl tricyclo[4.2.2.02,5]deca-3,7,9-triene-7,8-dicarboxylate (2) occurred at the cyclobutene ring. Thermal fragmentation of the adducts (3) or the corresponding S-oxides (6) gave dimethyl phthalate and the title diheteratricyclononenone derivatives (4) or their S-oxides (7).
Published Version
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