- The synthesis of asymmetric ethylenediamine derivatives catalyzed by ion-exchange resins
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The ring-opening reaction of aziridine with alkylamines over a series of ion-exchange resins was investigated. Among these catalysts, D001-CC exhibited excellent catalytic performance. The catalysts were characterized by SEM and N2 adsorption-desorption. The results indicated that the selectivity of N,N-diethylethylenediamine mainly depended on the acidity and S BET of the resins. Strong Br?nsted acid sites played an important role on the conversion of aziridine, and the distribution of acid sites on catalyst had a significant effect on the selectivity of N,N-diethylethylenediamine. The reaction parameters, such as reaction time, molar ratio, reaction temperature, and catalyst loading, were also optimized and N,N-diethylethylenediamine was obtained in an excellent yield of 97 %. Furthermore, D001-CC was efficiently recycled five times by simple treatment with large amounts of deionized water and mineral acid. Finally, a series of asymmetric ethylenediamine derivatives were successfully synthesized with this method. Therefore, a simple and versatile process for the synthesis of asymmetric ethylenediamine derivatives has been established over ion-exchange resins.
- Wang, Wenwen,Wei, Ruisong,Yin, Guohui,Tian, Jun,Duan, Yifan,Chen, Ligong,Li, Yang
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p. 4511 - 4522
(2015/06/30)
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- N-alkylation of ethylenediamine with alcohols catalyzed by CuO-NiO/γ-Al2O3
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A simple method for N-alkylation of 1, 2-diaminoethane with different alcohols in a fixed-bed reactor using cheap CuO-NiO/γ-Al2O 3 as the catalyst has been developed. The present catalytic system was applicable in the N-alkylation of 1, 2-diaminoethane with both primary and secondary alcohols. Mono-N-alkylation of 1, 2-diaminoethane with low-carbon alcohols resulted in high yields; the yields of tetra-N-alkylation of 1, 2-diaminoethane with low-carbon alcohols declined markedly with the increase of the molecular volume of alcohols.
- Huang, Jia-Min,Xu, Lu-Feng,Qian, Chao,Chen, Xin-Zhi
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experimental part
p. 304 - 307
(2012/08/28)
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- N-alkylation of ethylenediamine with alcohols catalyzed by CuO-NiO/?3-Al2O3
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A simple method for N-alkylation of 1,2-diaminoethane with different alcohols in a fixed-bed reactor using cheap CuO-NiO/?3-Al2O3 as the catalyst has been developed. The present catalytic system was applicable in the N-alkylation of
- Huang, Jia-Min,Xu, Lu-Feng,Qian, Chao,Chen, Xin-Zhi
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p. 304 - 307
(2015/03/03)
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- Method and apparatus for sunless tanning
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Apparatus for simulating skin tanning comprises a receptacle containing a fluid comprising dihydroxyacetone, a receptacle containing a fluid comprising a secondary polyamine, and dispensing means for simultaneously or sequentially providing desired amounts of dihydroxyacetone and polyamine.
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- Pyridylcarbonyl and thiocarbonyl derivatives useful as fungicides
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The substituted heteroaryl compounds of this invention are good fungicides. In particular, they possess especially good activity against Bean Powdery Mildew, and other plant fungal diseases.
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