A nano-organo catalyzed route towards the efficient synthesis of benzo[b]pyran derivatives under ultrasonic irradiation. Issue 110 (15th November 2016)

• Record Type: Journal Article
• Authors: Nongrum, Ridaphun; Nongthombam, Geetmani Singh; Kharkongor, Mattilang; Star Rani, Jims World; Rahman, Noimur; Kathing, Chingrishon; Myrboh, Bekington; Nongkhlaw, Rishanlang
• Is Part Of: RSC advances. Volume 6:Issue 110(2016)
• Page Start: 108384
• Page End: 108392
• Publication Date: 2016-11-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra24108e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Organocatalyst crafted on silica supported ferrite nanoparticle (Fe2 O3 @SiO2 @VB1 ) for 4 H -benzo[ b ]pyrans synthesis. Abstract : An efficient, one-pot synthesis of benzo[ b ]pyrans catalyzed by vitamin B1 functionalized Fe2 O3 @SiO2 NPs under ultrasonic conditions is reported herein. The nano-organocatalyst was synthesized and characterized by FT-IR, TEM, EDS, powder XRD, etc. Several benzo[ b ]pyran derivatives were prepared with satisfactory yields and the nanocatalyst was magnetically retrieved and recycled. The salient features of this protocol include convenient work-up procedure, mild reaction conditions, easy catalyst recovery, shorter reaction time and use of green solvents. Ultrasound energy has been meticulously exploited for the synthesis of a nano-organocatalyst as well as for the preparation of several benzo[ b ]pyran derivatives. The biological activity of the synthesized benzo[ b ]pyrans were investigated and one of the derivatives was found to demonstrate profound activity in suppressing the side-effects of chlorpyrifos, an insecticide on the morphology of the external gills of the Duttaphrynus melanostictus tadpoles.