When triphenylcyclopropene is converted to hexaphenylbenzene on treatment with sodium or lithium amide in liquid ammonia a simple dimer can be intercepted, triphenylcyclopropyl-triphenylcyclopropene (Ia). This dimer is also formed when triphenylcyclopropene is heated in refluxing xylene. Treatment of the dimer with potassium amide converts it to hexaphenylbenzene, while pyrolysis of the dimer at 280
Au-catalyzed isomerization of cyclopropenes: a novel approach to indene derivatives
作者:Changkun Li、Yi Zeng、Jianbo Wang
DOI:10.1016/j.tetlet.2009.03.203
日期:2009.6
AuPPh3Cl/AgOTf-catalyzed reaction of cyclopropenes is found to be highly efficient, giving indenederivatives in high yields. The reaction is suggested to proceed through gold vinyl carbenoid intermediate.