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Abstract
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A nanorod-structured organic–inorganic hybrid material namely nanorod-[SiO2–Pr–Im–SO3H][CF3CO2] (N-[SPIS][TFA]) has been applied as a highly efficacious, dual-functional, and recoverable catalyst for the solvent-free preparation of 3,3'-(arylmethylene)-bis(2-hydroxynaphthoquinone) {3,3′-(arylmethylene)-bis(2-hydroxynaphthalene-1,4-dione)} derivatives in high yields and relatively short times. The one-pot pseudo-multi-component reaction of 2-hydroxynaphthoquinone (2-hydroxynaphthalene-1,4-dione) (2 eq.) and arylaldehydes (1 eq.) has been used for the preparation of these compounds.
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