Abstract
The first N-heterocyclic carbene 1 featuring a cyclic sulfonamide structural motif has been prepared from 1,2,4-benzothiadiazine-1,1-dioxide. Within the six-membered heterocycle the carbene C atom is bound to an amino and a sulfonamido group. The (COD)Rh and (CO)2Rh complexes of the new NHC have been prepared and fully characterised including X-ray diffraction studies. Spectroscopic and structural data indicate that 1 is a poor overall donor (TEP: 2063 cm−1) and it has donor/acceptor properties that are close to those of related cyclic carboxamide substituted carbenes.
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