Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 44, Issue 1, Pages 93-115Publisher
SPRINGER
DOI: 10.1007/s11164-017-3092-3
Keywords
Biocatalyst; Apatite derivatives; Bronsted base; Lewis acid; Tetrahydrobenzo[b]pyrans
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Funding
- Islamic Azad University, Khorasgan Branch
- Islamic Azad University, fasa Branch
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Nanosized Ca9.5Mg0.5(PO4)(5.5)(SiO4)(0.5)F-1.5 was used as a biocatalyst for the synthesis of tetrahydrobenzo[b]pyrans derivatives via one-pot three-component reaction of various aldehydes, dimedone and malononitrile. The reactions were easily carried out at 60 A degrees C under mild and heterogeneous conditions. The catalyst was easily synthesized by high-energy ball milling, and the effect of some parameters such as specific surface area, pore volume, particle size, pH and crystallinity degree of the catalyst on the yield and reaction time was studied. The catalyst showed both Bronsted base and Lewis acid properties. The acidic sites were determined by FT-IR spectroscopy of the pyridine adsorption technique at different temperatures. Using a biocatalyst and an environmentally benign procedure, good to high yields of the products and short reaction time were the advantages of the method.
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