29304-92-5Relevant academic research and scientific papers
Base-catalysed isomerization of 7-phenyl-1,3,5-cycloheptatriene
Zwaard, A. W.,Prins, M. D.,Kloosterziel, H.
, p. 188 - 192 (2007/10/02)
Under the influence of basic alcohol, 7-phenyl-1,3,5-cycloheptatriene (7c) forms its 1-, 2- and 3-isomers (viz. 1c, 2c and 3c) in parallel reactions, contrary to suggestions made in the literature.The activation parameters for these reactions are given.The difference in behaviour (in isomerization and exchange reactions under basic conditions) between 7-(methoxycarbonyl)-1,3,5-cycloheptatriene (7b) and 7-phenyl-1,3,5-cyclopentatriene (7c) is explained by the weaker electron-attracting properties of the phenyl ring as compared to the methoxycarbonyl substituent.
Cyclic cross-conjugated hydrocarbons having inserted p-quinoid ring-I. Diphenyl-p-tropylphenylmethyl cation formed on an attempted preparation of 1-cycloheptatrienylidene-4-diphenylmethylidene-2,5-cyclohexadiene
Takahashi,Takenaka,Nozoe
, p. 2191 - 2195 (2007/10/12)
In connection with the synthetic studies of the cross-conjugated system 2, p-(diphenylhydroxymethyl)phenyltropolidene (13)* was prepared. On treatment with CF3COOH, 13 transformed to an aryltropylium ion (15) via an unstable blue colored compound. Based on NMR spectroscopy and some chemical properties the structure of the pigment is assumed to be diphenyl-p-tropylphenylmethyl cation (16) rather than the primarily anticipated cross-conjugated hydrocarbon 9,9-diphenyl[1.6.7]quinarene (6).
