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Nuclear magnetic resonance spectroscopy and the structures of the regioisomeric products of the cycloaddition of C-ethoxycarbonyl-N-arylnitrilimines to α,β-unsaturated ketones
作者:Ahmad S. Shawali、Saleh T. Ezmirly、Ahmad M. Bukhari
DOI:10.1016/0584-8539(92)80127-i
日期:1992.8
H-1 NMR chemical shifts were used to assign the structures of the regioisomeric products obtained from the reactions of C-ethoxycarbonyl-N-arylnitrilimines 2A-E to alpha,beta-unsaturated ketones 3a-j. The assignments were based on the large observed difference between chemical shifts of the H-4 and H-5 of the 2-pyrazoline ring residue. Values of 1.29 +/- 0.06 and 0.34 +/- 0.03 ppm were found for DELTA-delta-4,5 for the 5-aroyl- and 4-aroyl-2-pyrazoline regioisomers 4 and 5, respectively. The regioselectivity in the studied cycloaddition reactions is interpreted in terms of FMO method.
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AKCAMUR, Y.;PENN, G.;ZIEGLER, E.;STERK, H.;KOLLENZ, GERT;PETERS, KARL;PET+, MONATSH. CHEM., 1986, 117, N 2, 231-245
作者:AKCAMUR, Y.、PENN, G.、ZIEGLER, E.、STERK, H.、KOLLENZ, GERT、PETERS, KARL、PET+
DOI:——
日期:——
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HASSANEEN, HAMDI, M.;HILAL, RIFAAT, H.;ELWAN, NEHAL, M.;HARHASH, ABDELHAM+, J. HETEROCYCL. CHEM., 1984, 21, N 4, 1013-1016
作者:HASSANEEN, HAMDI, M.、HILAL, RIFAAT, H.、ELWAN, NEHAL, M.、HARHASH, ABDELHAM+
DOI:——
日期:——
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SHAWALI A. S., J. HETEROCYCL. CHEM. <JHTC-AD>, 1977, 14, NO 3, 375-381
作者:SHAWALI A. S.
DOI:——
日期:——
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Hassaneen, Hamdi M.; Hilal, Rifaat H.; Elwan, Nehal M., Journal of Heterocyclic Chemistry, 1984, vol. 21, p. 1013 - 1016
作者:Hassaneen, Hamdi M.、Hilal, Rifaat H.、Elwan, Nehal M.、Harhash, Abdelhamid、Shawali, Ahmad S.
DOI:——
日期:——