期刊
JOURNAL OF CATALYSIS
卷 380, 期 -, 页码 178-185出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.10.011
关键词
Asymmetric secondary amines; Alcohol amination; Co/SiO2 catalysts; Nitriles/alcohols reaction
资金
- Universidad Nacional del Litoral (UNL), Argentina
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Argentina
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT), Argentina
The synthesis of asymmetric secondary amines (ASA) is commonly achieved by N-alkylation of primary amines with alcohols. Here, we investigated the ASA synthesis via the direct amination of alcohols with nitriles, which avoids the synthesis, separation and purification of the primary amines in a first step. Specifically, the ASA synthesis via N-alkylation of butyronitrile (BN) with primary (n-propanol, iso-butanol and n-octanol) and secondary (2-propanol, 2-butanol and 2-octanol) alcohols was studied on SiO2-supported Co, Ni and Ru catalysts. Competitive BN hydrogenation-condensation reactions formed dibutylamine (the symmetric secondary amine) and tertiary amines as main secondary products. On Co/SiO2, the ASA selectivities for BN/primary alcohol reactions were between 49 and 58% at complete BN conversion, forming dibutylamine and tertiary amines as byproducts. For BN/secondary alcohol reactions, Co/SiO2 formed selectively (ASA + dibutylamine) mixtures containing 78-85% of ASA, thereby showing that the alcohol amination with nitriles is an attractive alternative route for the synthesis of valuable asymmetric secondary amines. (C) 2019 Elsevier Inc. All rights reserved.
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