Reactions of mixed dialkyl- and trialkylamines over Pd/γ-Al2O3
Reactions of mixed dialkyl- and trialkylamines over Pd/γ-Al2O3
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混合二烷基胺和三烷基胺在 Pd/γ-Al2O3 上的反应
DOI：
10.1016/j.jcat.2006.04.032
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发表时间：
2006
影响因子：
7.3
通讯作者：
R. Prins
中科院分区：
文献类型：
--
作者：
N. Sivasankar;R. Prins
研究了Pd/γ-Al_2O_3催化剂上二烷基胺、二戊胺和N-甲基己胺与三烷基胺、三己胺和N，N-二己基甲胺在300 ° C、3MPa下的反应。二戊胺通过缩合反应生成三戊胺和戊胺，并通过氢解反应生成戊胺、戊烷和戊烯。三戊胺和N，N-二己基甲胺通过氢解反应生成二烷基胺和烷烃和烯烃。N-甲基己胺通过反硝化反应生成混合的三烷基胺N，N-二己基甲胺和N，N-二甲基己胺，以及通过氢解反应生成烷基胺己胺和甲胺以及烷烃己烷和甲烷。混合三烷基胺的初始形成速率几乎相等。这表明不仅己基，而且甲基可以在两个N-甲基己胺分子之间转移。在二戊胺与N，N-二己基甲胺的反应中，生成的N，N-二戊基甲胺比N，N-二戊基己胺多。甲基和其他烷基的转移速率相当，证明烯胺不是二烷基胺和三烷基胺反应中唯一的中间体。
The reactions of the dialkylamines dipentylamine and N-methylhexylamine and the trialkylamines trihexylamine and N,N-dihexylmethylamine were studied over Pd/γ-Al2O3at 300 °C and 3 MPa. Dipentylamine reacted by disproportionation to tripentylamine and pentylamine and by hydrogenolysis to pentylamine and pentane and pentene. Tripentylamine and N,N-dihexylmethylamine reacted by hydrogenolysis to dialkylamines and alkanes and alkenes. N-methylhexylamine reacted by disproportionation to the mixed trialkylamines N,N-dihexylmethylamine and N,N-dimethylhexylamine, as well as by hydrogenolysis to the alkylamines hexylamine and methylamine and the alkanes hexane and methane. The initial rates of formation of the mixed trialkylamines were almost equal. This indicates that not only the hexyl group, but also the methyl group can be transferred between two N-methylhexylamine molecules. In the reaction between dipentylamine and N,N-dihexylmethylamine, more N,N-dipentylmethylamine than N,N-dipentylhexylamine was formed. The comparable rates of transfer of methyl and other alkyl groups prove that enamines are not the only intermediates in the reactions of dialkyl- and trialkylamines.