Quinoidal tetrazines: formation of a fascinating compound class.
2007
A series of different N-heterocyclic carbenes (NHCs) were reacted with 3,6-bis(3‘,5‘-dimethylpyrazolyl)-tetrazine in the presence of an inorganic carbonate to provide access to a hitherto unprecedented compound class. The formed tetrazine derivatives bearing the NHC in the 3-position and an oxygen in the 6-position show a quinoidal-like structure, according to physical examinations and X-ray crystallography.
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