Rotational energy barrier of the polarized carbon-carbon double bond in 3-(4-dimethylaminobenzylidene)pentane-2,4-dione

Tetrahedron Letters

Volumn 39, Issue 22, 1998, Pages 3841-3842

  Yavari, Issa ^a   Zonouzi, Afsaneh ^a   Hekmat Shoar, Rahim ^a  

^a TARBIAT MODARES UNIVERSITY   (Iran)

Author keywords

[No Author keywords available]

Indexed keywords

3 (4 DIMETHYLAMINOBENZYLIDENE)PENTANE 2,4 DIONE; ETHYLENE DERIVATIVE; NITROBENZENE; UNCLASSIFIED DRUG;

ARTICLE; POLARIZATION; PROTON NUCLEAR MAGNETIC RESONANCE; ROTATION;

EID: 0032575178     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(98)00627-3     Document Type: Article

References (12)

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2. 1. Sandström, J. and Wennerbeck, I. Acta Chem. Scand.,1970 ,24 ,1191; Sandström, J. Top. Stereochem.,1983, 14,83 ; Kalinowski, H. -O. and Kessler, H. Top. Stereochem.,1973 ,7 ,303 .
3. 1. Sandström, J. and Wennerbeck, I. Acta Chem. Scand.,1970 ,24 ,1191; Sandström, J. Top. Stereochem.,1983, 14,83 ; Kalinowski, H. -O. and Kessler, H. Top. Stereochem.,1973 ,7 ,303 .
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6. 2. Kolle, U., Kolb, B. and Mannschreck, A. Chem. Ber.,1980 ,113 ,2545; Sandström, J. Acc. Chem. Res.,1985, 18,148 ; Sjöstrand, U. and Sandström, J. Tetrahedron,1978 ,34 ,3305 .
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8. 2), 111.41 (arom CH),119.47(C),131.97(aromCH), 137.31(C), 140.77(CH), 151.64 (C-N), 196.11 and 206.78 (2 C=O ) .
9. 5. Proton and carbon-13 NMR spectra were recorded on a Jeol JNM-EX90 FT NMR spectrometer operating at a field of 21.15 kG . The temperature of the probe was adjusted with a temperature control unit using a heating element. To reach the equilibrium temperature, each sample tube was left in the probe for at least 5 min before measurement.
10. 6. Günther, H. NMR Spectroscopy , 2nd ed., Chapt. 9 ,1995 ,Wiley, New York .
11. 7. Anet, F. A. L. and Anet, R. Dynamic Nuclear Magnetic Resonance Spectroscopy, Cotton, F. A.and Jackman, L. M. ,Ed., Academic Press , New York , N. Y., 1975 , pp 543-619 .
12. 3 resonances slightly decreased with increasing temperature, two fairly sharp signals was still visible at 190 °C, the highest temperature investigated.