Tetrahedron p. 5237 - 5244 (1991)
Update date:2022-07-30
Topics:
Yabukov, A. P.
Tsyganov, D. V.
Belen'kii, L. I.
Bogdanov, V. S.
Ugrak, B. I.
Krayushkin, M. M.
It has been found that steric hindrances of the CHCl2 group rotation around CAr-CHCl2 bond in o,o'-dialkylsubstituted benzylidene dichlorides call forth a non-equivalence of the alkyls in positions 2 and 6.The non-equivalence displays in 1H and 13C NMR spectra at room temperature and at -20 deg C.At the latter temperature, the spectra of 2,4,6-trimethyl-3-chloromethylbenzylidene dichloride and bis(dichloromethyl)mesitylene indicate the presence of two conformations, the assignment of signals having accomplished for each of them.
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