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F. Jiang, Z. Yan, X. Chen, X. Li, S. Streiff, M. Pera-Titus, Catal. Sci. Technol., (2023), 13, 187-194.
Pentamethyldiethylenetriamine is a permethylated polyamine that is widely used to prepare foam polyurethane. The current technology for its synthesis relies on diethylenetriamine methylation with formaldehyde under H2. This route is selective, but the use of formaldehyde raises safety and environmental concerns. Herein we present an alternative non-toxic route using methanol as greener and cheaper methylating reagent. The reaction proceeds fast and selectively over composite copper catalysts with a pentamethyldiethylenetriamine yield of 75% and resistance to sintering..
L. Huang, H. Mei, S. Li, Z. Yan, S. Streiff, W. Shen, H. Xu, Journal of Fudan University (Natural Science), (2022), 61, 734-741.
The direct amination of aliphatic alcohols with ammonia is an environment-friendly route for the
synthesis of primary amines. In this work, LTA zeolite-encapsulated Ru nanoparticles (Ru@LTA) were
successfully synthesized and employed for the direct amination of 1-octanol with NH3 into octylamine at low NH3/alcohol ratios (2.1-2.4). A 76% selectivity to octylamine was obtained over a 5Ru@KA zeolite catalyst. The positive effect of Ru@LTA zeolite catalysts on primary amine selectivity stems from the steric hindrance.