83320-76-7Relevant academic research and scientific papers
Syntheses and Properties of Dimethyldiphenyltetradehydro-trideca-, -pentadeca-, -heptadeca-, -nonadeca-fulvene, and Benzannelated Pentadecafulvene Derivatives
Kuroda, Shigeyasu,Ojima, Juro,Kitatani, Kazuto,Kirita, Mitsuru,Nakada, Tadayuki
, p. 2987 - 2996 (2007/10/02)
Syntheses of 4,9-dimethyl-13-diphenylmethylene-5,6,7,8-tetradehydrocyclotridecene (7), 4,9-dimethyl-15-diphenylmethylene-5,6,7,8-tetradehydrocyclopentadecene (8), 6,11-dimethyl-17-diphenylmethylene-7,8,9,10-tetradehydrocyclopentadecene (9), and 6,11-dimethyl-19-diphenylmethylene-7,8,9,10-tetradehydrocyclononadecene (10) are described.Although examination of the 1H n.m.r. spectra suggested that all of the fulvenes (7)-(10) are atropic, the benzannelated derivatives of pentadecafulvene (8), i.e. 13-methyl-7-diphenylmethylene-14,15,16,17-tetradehydrobenzocyclopentadecene (25), 13-methyl-9-diphenylmethylene-14,15,16,17-tetradehydrobenzocyclopentadecene (26) and 7-diphenylmethylene-16,17,18,19-tetradehydrodibenzocyclopentadecene (27) were prepared in order to examine the tropicity of (8) more closely.Comparison of the 1H n.m.r. spectra of these benzannelated fulvenes (25)-(27) with that of 88) reveals that the nonbenzannelated fulvene 88) is atropic.The influence of benzannelation upon the structure of the molecular skeleton of the tetradehydropentadecafulvene system is also discussed.
THE SYNTHESIS OF DIPHENYLTRIDECA-, -PENTADECA-, -HEPTADECA-, AND -NONADECAFULVENE DERIVATIVES
Kuroda, Shigeyasu,Kitatani, Kazuto,Ojima, Juro
, p. 2657 - 2660 (2007/10/02)
Title fulvenes were synthesized through the reaction of the large-membered annulenones with diphenylketene, and examination of (1)H-NMR spectra suggests that the fulvenes are atropic.
