Synthesis, characterization and catalytic application of a novel ethyl and boron sulfonic acid based bifunctional periodic mesoporous organosilica

A novel ethyl and boron sulfonic acid based bifunctional periodic mesoporous organosilica [BPMO-Et-B(OSO3H)2] with dual Lewis-protic acidic sites was prepared, characterized and applied as efficient nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans. The BPMO-Et-B(OSO3H)2 was prepared by the chemical attachment of boric acid [B(OH)3] on an ethyl-based periodic mesoporous organosilica (PMO-Et) followed by treatment with chlorosulfonic...