CO2, the main component of greenhouse gas, is currently developed as a promising surrogate of carbon feedstock. Among various conversion routes, CO(2)undergoing catalytic reduction can furnish hydrogen/energy carriers and value-added chemicals, while specific metal-containing catalysts or organocatalysts are often prerequisite for smooth proceeding of the involved reaction processes. In this work, both formic acid and N-containing benzoheterocyclic compounds (including various benzimidazoles, benzothiazole, and benzoxazole) along with silanols could be synthesized with high yields (>90%) from catalyst-free reductive upgrading of CO(2)under mild conditions (50 degrees C). The endogenous X-CO species, derived from theN-methyl-substituted amide-based solvent [Me2N-C(O)-R], especially PolarClean, andO-formyl group [O-C(O)-H] ofin situformed silyl formate, were found to play a prominent promotional role in the activation of the used hydrosilane for reductive CO(2)insertion, as demonstrated by density functional theory (DFT) calculations and isotopic labeling experiments. Moreover, reaction mechanisms and condition-based sensitivity assessment were also delineated.
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Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem