Protonation of Tetraphenyl- and 2,3,4-Triphenylcyclopentadienone - An NMR and X-ray Crystallographic Study
作者:Laura E. Harrington、James F. Britten、Michael Casey、John Grealis、Yannick Ortin、Helge Müller-Bunz、Michael J. McGlinchey
DOI:10.1002/ejoc.201700019
日期:2017.6.16
e (22) a structural isomer of 17. Mechanisms are presented that rationalize these observations. The protonation of 4-hydroxy-2,3,4-triphenylcyclopentadienone, the precursor to 2,3,4-triphenylcyclo¬pentadienone, generates 2-(2′-oxo-3′,4′,5′-triphenylcyclopent-3′-enyl)-3,4,5-triphenyl-cyclopenta-2,4-dienone, (30) which has been unequivocally characterized by X-ray crystallography. The establishment of
2,3,4,5-四苯基环戊二烯酮(四环酮)的质子化生成 6,11-diphenyl-5H-benzo[a]fluoren-5-one (17) 和 2,3,4,5-tetraphenylcyclopent-2-en -1-一(18)为主要产品。这与产生 5,6-二苯基-11H-苯并[a]芴-11-酮 (22) 17 的结构异构体的四旋风热解形成对比。提出了使这些观察合理化的机制。2,3,4-三苯基环戊二烯酮的前体 4-羟基-2,3,4-三苯基环戊二烯酮的质子化生成 2-(2'-oxo-3',4',5'-triphenylcyclopent-3' -enyl)-3,4,5-triphenyl-cyclopenta-2,4-dienone, (30) 已通过 X 射线晶体学明确表征。固态分子 30 构象的建立,这与其在溶液中的结构有关,