期刊
ORGANIC & BIOMOLECULAR CHEMISTRY
卷 6, 期 2, 页码 287-295出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b716508k
关键词
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1,3-Dimethylimidazolium-2-carboxylate and -4-carboxylate (norzooanemonine), which belong to two distinct classes of heterocyclic mesomeric betaines, undergo thermal decarboxylations to the N-heterocyclic carbenes imidazol-2-ylidene and imidazol-4-ylidene, respectively. These carbenes can be detected by ESI mass spectrometry and can be trapped by isocyanates to imidazolium-amidates, the structure of which was proved by independent syntheses. We performed calculations to characterize the different types of conjugation in the imidazolium-carboxylates.
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