One-pot multicomponent green LED photoinduced synthesis of chromeno[4,3-<i>b</i>]chromenes catalyzed by a new nanophotocatalyst histaminium tetrachlorozincate

and hydroxyl radicals have proved to be active species in the presented photocatalytic reaction. In addition, the hot filtration test confirms enough stability of the photocatalyst and no significant leaching and destruction of the framework in the course of the reaction. The major advantages of the presented methodology include easy work-up, cost effectiveness, nontoxic nature, broad substrate scope, 100% atom economy, ease of separation, and environment friendly reaction conditions. Finally, the catalyst could be reused many times without significant loss of activity.

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