A complete model for the prediction of 1H- and 13C-NMR chemical shifts and torsional angles in phenyl-substituted pyrazoles
作者:Jose R Carrillo、Fernando P Cossı́o、Angel Dı́az-Ortı́z、Marı́a J Gómez-Escalonilla、Antonio de la Hoz、Begoña Lecea、Andrés Moreno、Pilar Prieto
DOI:10.1016/s0040-4020(01)00291-5
日期:2001.5
13C chemicalshifts of the ortho and meta carbon atoms of the phenyl groups in 29 N-phenyl-substituted pyrazole derivatives and 11 C-phenyl-substituted pyrazole derivatives has been found. For the N-phenyl-substituted derivatives a correlation between torsional angles and δmeta-H–δortho-H values has also been demonstrated. In all cases good correlations between angles and differences in chemical shifts
Gupton, John T.; Gall, John E.; Riesinger, Steve W., Journal of Heterocyclic Chemistry, 1991, vol. 28, # 5, p. 1281 - 1285
作者:Gupton, John T.、Gall, John E.、Riesinger, Steve W.、Smith, Stanton Q.、Bevirt, Kathy M.、et al.
DOI:——
日期:——
The effect of focused microwaves on the reaction of ethyl N-trichloroethylidenecarbamate with pyrazole derivatives
作者:JoséR. Carrillo、Angel Díaz-Ortiz、Antonio de la Hoz、María J. Gómez-Escalonilla、Andrés Moreno、Pilar Prieto
DOI:10.1016/s0040-4020(99)00508-6
日期:1999.7
Under microwave irradiation vinylpyrazoles react with ethyl N-trichloroethylidenecarbamate1 to give the addition to the imine system through the conjugated vinyl group. Likewise, compound 1 react with the NH group of pyrazolylhydrazones, if present. To the best of our knowledge this reaction type has not been described before and only can be performed under microwave irradiation. By classical heating