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A novel and efficient methodology for the synthesis of 2-phenylnaphthalenes from styrene oxides using a recyclable [HNMP]+HSO4− ionic liquid catalyst with high atom efficiency has been developed. The reaction works smoothly under metal-, acid-, additive- and solvent-free conditions along with excellent yield.

The construction of C 3 -symmetric triarylbenzenes via cyclotrimerization of alkynes using Amberlyst-15/1-butyl-3-methylimidazolium hexafluorophosphate [Bmim][PF 6 ] 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][PF 6 ] as well as 100% atom efficiency makes the developed protocol more green.

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A green protocol for the synthesis of substituted alkenes from alcohols and styrenes using recyclable [NMP]+HSO4− ionic liquid catalyst with higher atom efficiency has been developed.