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Sulfur, mercury, and boron adducts of sydnone imine derived anionic N-heterocyclic carbenes
- Freese, Tyll, Namyslo, Jan C., Nieger, Martin, Schmidt, Andreas
- RSC advances 2019 v.9 no.9 pp. 4781-4788
- anions, boron, carbenes, gold, heterocyclic nitrogen compounds, imines, ligands, mercuric chloride, mercury, nitrogen, sulfides, sulfur
- The sydnone imines (5-benzoylimino)-3-(2-methoxyphenyl)-sydnone imine and molsidomine were deprotonated at C4 to give sydnone imine anions which can be represented as anionic N-heterocyclic carbenes, respectively. Trapping reactions with sulfur gave unstable sydnone imine sulfides which were stabilized by the formation of methyl thioethers, methyl sulfoxides, gold complexes [(PPh₃)Au–S-sydnone imine] and a bis(ligand) mercury(ii) complex. The latter possesses a tetrahedral coordination of the mercury central atom to the sulfur atoms with the N6 nitrogen atoms coordinating as neutral ligands. Water converted the molsidomine anion into ethyl(2-morpholino-2-thioxoacetyl)carbamate. Mercury(ii)chloride and triphenylborane were employed to trap the sydnone imine carbenes as mercury complexes as well as BPh₃ adducts.