135963-00-7Relevant articles and documents
UNUSUAL EFFECTS OF STERIC HINDRANCES IN NMR SPECTRA OF o,o'-DIALKYLSUBSTITUTED BENZYLIDENE DICHLORIDES
Yabukov, A. P.,Tsyganov, D. V.,Belen'kii, L. I.,Bogdanov, V. S.,Ugrak, B. I.,Krayushkin, M. M.
, p. 5237 - 5244 (2007/10/02)
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.
