Lycka A, Frysová I, Slouka J. An anomalous course of the reduction of 2-(3-oxo-3,4-dihydroquinoxalin-2-yl)benzene diazonium salt: a reinvestigation.
MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007;
45:46-50. [PMID:
17080493 DOI:
10.1002/mrc.1915]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The 1H,13C and 15N NMR spectra of the reduction product of 2-(3-oxo-3,4-dihydroquinoxalin-2-yl)benzene diazonium salt with sodium sulfite were measured and analysed. It is shown that the reaction product corresponds to 1-(indazol-3-yl)-1,2-dihydro-benzimidazol-2-on and not 6H-quinoxalino[1,2-c] [1,2,3]benzotriazin-12(13H)-one as published previously. The correctness of the structure was confirmed by an independent synthesis. The observed 15N chemical shifts were compared with the predicted ones using the ACD/NNMR 9.01 program.
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