Nano-titania-supported Preyssler-type heteropolyacid: An efficient and reusable catalyst in ultrasound-promoted synthesis of 4H-chromenes and 4H-pyrano [2, 3-c] …
D Azarifar, SM Khatami, R Nejat-Yami
Index: Azarifar, Davood; Khatami, Seyed-Mola; Nejat-Yami, Razieh Journal of Chemical Sciences, 2014 , vol. 126, # 1 p. 95 - 101
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Citation Number: 13
Abstract
Abstract An efficient and convenient procedure has been described for one-pot multi- component synthesis of tetrahydrobenzo [b] pyrans known as 4 H-chromenes and 1, 4- dihydropyrano [2, 3-c] pyrazole derivatives in the presence of nano-titania-supported Preyssler-type heteropolyacid, n-TiO 2/H 14 [NaP 5 W 30 O 110], as a heterogeneous catalyst. The reactions proceeded smoothly under ultrasound irradiation condition to ...
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