Stepwise fabrication and architecture of heterogeneous 9-thiourea epiquinine …

Abstract. Heterogeneous 9-thiourea epiquinine catalysts are prepared by covalently anchoring 9-(3,5-is(trifluoromethyl) phenylthiourea)epiquinine on mesoporous silica surfaces via mercapto linker. It is found that 9-thiourea epiquinine moieties are located comparably on the interior and exterior surfaces of SBA-15 while preferentially on the exterior surface of MCM-41. The heterogeneous 9-thi…