Triphenyl(3-sulfopropyl)phosphonium trinitromethanide as a novel nanosized molten salt: Catalytic activity at the preparation of dihydropyrano[2,3-c]pyrazoles

Triphenyl(3-sulfopropyl)phosphonium trinitromethanide, efficiently promoted the preparation of dihydropyrano[2,3-c]pyrazole derivatives under mild reaction conditions with high to excellent yields.239