The mesoionic dehydrodithizone (I) reacts readily, in 1,3-dipolar fashion, with activated alkenes and alkynes to furnish cycloadducts and with ethoxycarbonyl-methylenetriphenylphosphorane to yield the betaine (IX).
P. Rajagopalan and P. Penev, J. Chem. Soc. D, 1971, 490b DOI: 10.1039/C2971000490B
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