Abstract
Biological carbon fixation can convert carbon dioxide (CO2) into chemicals with a variety of uses, and has thus attracted considerable attention, as CO2 is nonhazardous, inflammable and plentiful in the environment. We report here that alumina (Al2O3) can by itself catalyze the carbonylation of o-phenylenediamines with CO2 to produce 2-benzimidazolones. Such alumina-catalyzed carbonylation with CO2 is applicable to various diamine derivatives to provide the corresponding cyclic ureas. Following the reaction, the alumina catalyst is also advantageous in that it can be filtered, accumulated, and reused.
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