This contribution describes the synthesis and structural investigation of the symmetric and nonsymmetric oxamides N,N Ј-bis(2-hydroxyphenyl)oxamide 1, N,N Ј-bis(5-tert-butyl-2-hydroxyphenyl)oxamide 2, N,N Ј-bis(3,5-dimethyl-2-hydroxyphenyl)oxamide 3, N,N Ј-bis(2-hydroxybenzyl)oxamide 4, N,N Ј-diphenethyloxamide 5, N-(2-hydroxyphenyl)-N Ј-(2-methoxyphenyl)oxamide 6, N-(2-hydroxyphenyl)-N Ј-phenethyloxamide 7, (1S,2R)-(؊)-N-(2-hydroxyphenylcarbamoylcarbonyl)norephedrine 8, (1R,2S)-(؊)-N-(2-hydroxyphenylcarbamoylcarbonyl) 9, ethyl N-(2-hydroxyphenyl)oxalamate 10 and ethyl N-(2-methoxyphenyl)oxalamate 11. The structures were established by 1 H, 13 C, 15 N and variable temperature NMR spectroscopy. Compounds 1-4 and 6-11 are stabilized by intramolecular three-center hydrogen bonding between the amide proton and two oxygen atoms. The 1 H NMR / T value of the amide proton correlates with the 15 N NMR chemical shift. The X-ray diffraction molecular structures of 1 and 11 showed a planar conformation with trans configuration in the solid state, corresponding to the preferred conformation found in solution.

Mercury(II) and Methylmercury(II) Complexes of Novel Sterically Hindered Thiolates: 13C and 199Hg NMR Studies and the Crystal and Molecular Structures of [MeHg(SC6H2-2,4,6-Pr'3) ], [Hg(SC6H4-2-SiMe3)2], [Hg(2-SC5H3N-3-SiMe3)2], and [Hg|<2-SC6H4)2SiMe2|]2