Synthesis of 14-{[(Un)substituted phenyl] or alkyl}-14H-dibenzo[a,J]xanthenes Using Yb(OTf)3 as an Efficient Catalyst under Solvent-free Conditions

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2008,（6）
• 页码范围: 1105-1108
• 页数: 4页
• 语种: 英文

摘要

A series of 14-{ [(Un)substituted phenyl] or alkyl}-14H-dibenzo[a,J]xanthenes were prepared under solvent-free conditions by Yb(Otf)3 catalyzed condensation reactions of β-naphthol with various aldehydes.The process presented here is operationally simple,environmentally benign and has good to excellent yields.Furthermore,the catalyst can be recovered conveniently and reused efficiently.