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- W2804660178 abstract "Covalent adducts of imidazole-based mesoionic carbenes and nitrous oxide (N2 O, laughing gas) can be converted into azo dyes by reaction with arenes in the presence of AlCl3 or HCl. The azo coupling can be achieved with electron-rich aromatic compounds such as mesitylene, trimethoxybenzene, azulene, or dibenzo-18-crown-6. The latter coupling reaction allows for the easy preparation of a colorimetric sensor for potassium or sodium ions. As a putative intermediate of the reaction with acid, we were able to isolate and structurally characterize a rare diazohydroxide. Using imidazolium compounds with two N2 O groups, it was possible to prepare amine-substituted azo dyes or dyes with two azoarene groups attached to the heterocycle. A triazole-based mesoionic carbene was also found to form a stable covalent adduct with N2 O. The adduct could be used to prepare novel azo triazolium dyes in good yields." @default.
- W2804660178 created "2018-06-01" @default.
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- W2804660178 date "2018-05-14" @default.
- W2804660178 modified "2023-10-01" @default.
- W2804660178 title "Synthesis of Azo Dyes from Mesoionic Carbenes and Nitrous Oxide" @default.
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- W2804660178 doi "https://doi.org/10.1002/chem.201800306" @default.
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