Heterocyclic analogs of xanthiones: 5,6-fused 3-methyl-1-phenylpyrano[2,3-<i>c</i>
]pyrazol-4(1<i>H</i>
) thiones-synthesis and NMR (<sup>1</sup>
H, <sup>13</sup>
C, <sup>15</sup>
N) data
作者:Valerie Huemer、Gernot A. Eller、Wolfgang Holzer
DOI:10.1002/mrc.2609
日期:2010.6
Complete and unambiguous assignment of chemical shifts ((1)H, (13)C, (15)N) and couplingconstants ((1)H,(1)H; (13)C,(1)H) was achieved by the combined application of various one- and two-dimensional (1D and 2D) NMR spectroscopic techniques. Unequivocal mapping of most (13)C,(1)H spin couplingconstants is accomplished by 2D (delta, J) long-range INEPT spectra with selective excitation.