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Recent Advances in Cyclization Reaction of Alkynes under Transition Metal-Free Conditions

Remarkable achievements have been made in the construction of carbocyclic (heterocyclic) compounds through cyclization reaction of alkynes. It is vitally important to achieve the high selectivity of cyclization reactions, and neighboring group-participated selective cyclization reaction of alkynes is widely considered as an effective strategy. In this review, the recent advances in neighboring group-participated cyclization reaction of alkynes under transition metal-free conditions are summarized.