title: Direct synthesis of acid-base bifunctionalized hexagonal mesoporous silica and its catalytic activity in cascade reactions.
abstract: A series of efficient acid-base bifunctionalized hexagonal mesoporous silica (HMS) catalysts contained aminopropyl and propanesulfonic acid have been synthesized through a simple co-condensation by protection of amino group. The results of small-angle XRD, TEM, and N(2) adsorption-desorption measurements show that the resultant materials have mesoscopic structures. X-ray photoelectron spectroscopies, elemental analysis (EA), back titration, (29)Si NMR and (13)C NMR confirm that the organosiloxanes were condensed as a part of the silica framework. The resultant catalysts exhibit excellent acid-basic properties, which make them possess high activity for one-pot deacetalization-Knoevenagel and deacetalization-nitroaldol (Henry) reactions.
authors.affiliation: College of Chemistry, Jilin University, Changchun 130023, PR China.
authors.forename: Fanpeng
authors.initials: F
authors.lastname: Shang
authors.forename: Jianrui
authors.initials: J
authors.lastname: Sun
authors.forename: Shujie
authors.initials: S
authors.lastname: Wu
authors.forename: Heng
authors.initials: H
authors.lastname: Liu
authors.forename: Jingqi
authors.initials: J
authors.lastname: Guan
authors.forename: Qiubin
authors.initials: Q
authors.lastname: Kan