Magnetic NaY zeolite composite: Efficient and recoverable catalyst for the synthesis of dihydropyrano[3,2-b]chromenediones

Magnetic NaY zeolite composite is a novel heterogeneous acid catalyst. Th is has been synthesized through the zeolite and the volume ratio of 2: 1 of Iron(III) chloride hexahydrate and Ammonium iron(II) sulfate hexahydrate with ammonia solution. Furthermore, the catalyst possesses the advantages of the high thermal stability (200 °C), low cost for the simple synthetic procedure, and green reaction. Magnetic NaY zeolite composite is an efficient, readily available and reusable catalyst for the synthesis of dihydropyrano[3,2-b]chromenedione derivatives via the condensation of various aldehyde, and Kojic acid with dimedone