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3. The synthesis and reactivity of some sixmembered mesoionic compounds
Kappe Th., Lube W., Golser W., Hariri M., Thonhofer K., Stadlbauer W.
6. Internat. Congress of Heterocycl. Chem., Teheran (Iran), 13.7.1977, (Abstracts Book p. 373-4)

Abstract: Sixmembered mesoionic compounds such as pyrimidinium-olates or triazines were synthesized and reacted with dienes and heterodienes by cycloaddition.

abstract scheme
Scheme 3b
Scheme 3c