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Communication | Regular issue | Vol 53, No. 2, 2000, pp.265-270
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8760
Synthesis of New Mesomeric Betaines Containing a Triazolopyridiniumolate System and Their Unexpected Function as Masked Isocyanates

Norio Sakai, Makoto Funabashi, Satoshi Minakata, Ilhyong Ryu, and Mitsuo Komatsu*

*Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan


A series of mesomeric betaines containing 1-alkylated triazolopyridiniumolate system were synthesized and their cycloaddition with dimethyl acetylenedicarboxylate were examined. An unusual ring-opening reaction occurred to give pyridone derivatives indicating that these betaines act as masked isocyanates.