Abstract
The methods to prepare mesoporous silica materials and their derivatization by catalytically active functional groups covalently anchored to the surface are summarized. A short description of the major characterization techniques is also given. The transformations induced by solids with anchored basic functions mainly with various amino groups including oxidations, C-C forming reactions, and enantioselective alkylations are treated in details. A similar comprehensive analysis is given for processes catalyzed by anchored sulfonic acid groups. The important reactions studied are esterification, various condensations, protection of functional groups, and Friedel – Crafts reactions. The results of comparative studies are treated separately. The two final subsections are devoted to the application of bridged polysilsesquioxanes, also called periodic mesoporous organosilanes (PMOs) and cooperative acid – base catalysis.
Keywords: cyanosilylation, PMO sulfonic acid catalysts, MCM41, polysilsesquioxanes, Friedel, –, Crafts alkylation
Call for Papers in Thematic Issues
Catalytic C-H bond activation as a tool for functionalization of heterocycles
The major topic is the functionalization of heterocycles through catalyzed C-H bond activation. The strategies based on C-H activation not only provide straightforward formation of C-C or C-X bonds but, more importantly, allow for the avoidance of pre-functionalization of one or two of the cross-coupling partners. The beneficial impact of ...read more
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