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Effects of t-butyl substituents on valence tautomerism of 7-t-butyl-7-cyano-1,3,5-cycloheptatrienes to the norcaradiene form

โœ Scribed by Ken'ichi Takeuchi; Makoto Arima; Kunio Okamoto

Publisher
Elsevier Science
Year
1981
Tongue
French
Weight
260 KB
Volume
22
Category
Article
ISSN
0040-4039

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Primary dependence of 7-aryl-2,5-di-t-butyl-1,3,5-cycloheptatriene valence tautomerism on the ฯ€-acceptor strength of the 7-aryl substituent
โœ Ken'ichi Takeuchi; Hiroshi Fujimoto; Kunio Okamoto ๐Ÿ“‚ Article ๐Ÿ“… 1981 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 245 KB

l3 C NMR studies showed that the population of the norcaradiene form of the title systems containing p-CH30, H, and p-CF3 on the 7-aryl group increases in this order. The result is consistent with the prediction from the n-acceptor strength of the aryl group estimated by INDO calculations.