Abstract
Methodology of a selection and environmental economy in nitration reaction of aromatics will be rather attractive to replace traditional sulfonitric acid process in industry. The cross-linked pillared clays originated from a natural bentonite show an obviously selective catalysis in nitration reaction of alkylbenzenes by respectively using nitric acid and a nitrogen dioxide/molecular oxygen system when compared with Kyodai-nitration. Several hydroxyl-aluminum cross-linked bentonites (Al-CLB, NH4Al-CLB, HAl-CLB, LaAl- CLB) were prepared in various conditions from a natural bentonite with polymeric cationic complexes of aluminum as pillars or crosslinkers. When they were applied in the nitration of weakly activated aromatic substrates, a para-preferential nitration is achieved.
Keywords: Alkylbenzenes, clays, Kyodai-nitration, Nitration, Nitric acid, Nitrogen dioxide, Regioselectivity
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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