Amberlyst-15/[Bmim][PF6] Catalyzed Synthesis of C3-Symmetric Triarylbenzenes via Cyclotrimerization of Alkynes

The construction of C3-symmetric triarylbenzenes via cyclotrimerization of alkynes using Amberlyst-15/1-butyl-3-methylimidazolium hexafluorophosphate [Bmim][PF6] has been developed. The catalytic system works well for various substrates under milder reaction conditions. The developed methodology is operationally simple, and metal-free, solvent-free, and additive-free reactions with excellent yields make it good for synthetic utility. The recyclability of the Amberlyst-15/[Bmim][PF6] as well as 100% atom efficiency makes the developed protocol more green.