期刊
CATALYSIS TODAY
卷 381, 期 -, 页码 118-125出版社
ELSEVIER
DOI: 10.1016/j.cattod.2020.08.011
关键词
Niobium catalyst; Layered double hydroxides; Mixed oxides; Benzylamine oxidation; Ab initio calculations
资金
- Brazilian agency FAPEMIG (Fundacao de Amparo a` Pesquisa do Estado de Minas Gerais)
- Brazilian agency CAPES (Coordencaao de Aperfeicoamento de Pessoal de Nivel Superior) [001]
- Brazilian agency CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- Brazilian agency Rede Mineira de Qui-mica and Petrobras S.A.
- FEDER/Ministerio de Ciencia, Innovacion y Universidades-Agencia Estatal de Investigacion [PGC2018-098660-B-I00]
A series of mixed oxides-supported niobium-based catalysts have been successfully synthesized and applied for the oxidation reactions of benzylamine derivatives, showing enhanced selectivity towards oximes as the main products. Even alpha-substituted benzylamines yielded good isolated yields of oximes under optimized reaction conditions.
A series of mixed oxides-supported niobium-based catalysts has been synthesized and applied towards oxidation reactions of benzylamine derivatives. Under the optimized reaction conditions, the selectivity to oxime enhanced, leading to the main product with up to 72 %. Moreover, even alpha-substituted benzylamines were well tolerated and led to oximes in good isolated yields. It is important to mention; four equivalents of the harmless and inexpensive hydrogen peroxide were employed as oxidizing agent. Mechanism hypothesis suggested that the reaction proceed to selective benzylamine oxidation into nitroso intermediate, following by formation of the corresponding oxime tautomer mediated by an unstable water produced by NbOx supported catalyst. This consists the first mixed oxides-supported niobium-based catalyst for selective oxidation of benzylamines to oximes.
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