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| Description
| - Práce se zabývá studiem hydrogenace N-substituovaných alifatických aldiminů, zejména vztahem mezi heterogenním hydrogenačním katalyzátorem a tvorbou vedlejších produktů. Bylo zjištěno, že Pd a Pt katalyzátory vykazují pro hydrogenaci alifatických aldiminů typu R1-CH=N-CH2-R2 vysokou selektivitu na příslušný amin R1-CH2-NH-CH2-R2, kdežto selektivita Ni a Co katalyzátorů je značně nižší. Za katalýzy Ni a Co jsou dominantními složkami v hydrogenátu vedle R1-CH2-NH-CH2-R2 též symetrické aminy R1-CH2-NH-CH2-R1 a R2-CH2-NH-CH2-R2. V průběhu hydrogenace obsahují reakční směsi rovněž R1-CH=N-CH2-R1, R2-CH=N-CH2-R2 a R2-CH=N-CH2-R1. Chemismus reakcí vedoucích k tvorbě těchto vedlejších produktů byl postulován. Prvním krokem je izomerace iminu R1-CH=N-CH2-R2 na R2-CH=N-CH2-R1, ke které dochází na niklových a kobaltových katalyzátorech za podmínek katalytické hydrogenace a to i při nízkých teplotách, kdy jsou vyloučeny dehydrogenační reakce (e.g. 50°C). Tautomerní imin reaguje dále s původním iminem za vzniku R (cs)
- This paper deals with a study of the hydrogenation of N-substituted aliphatic aldimines, especially in the relation between a heterogeneous hydrogenation catalyst and the formation of by-products. It was found that Pd and Pt catalysts exhibit high selectivity for the hydrogenation of aliphatic aldimines of the type R1-CH=N-CH2-R2 to the corresponding amine R1-CH2-NH-CH2-R2, while the selectivity of Ni and Co catalysts is substantially lower. When hydrogenation is catalysed by Ni and Co, then the predominant products, besides R1-CH2-NH-CH2-R2, are symmetric amines R1-CH2-NH-CH2-R1 and R2-CH2-NH-CH2-R2. The reaction mixtures also contain R1-CH=N-CH2-R1, R2-CH=N-CH2-R2 and R2-CH=N-CH2-R1 during hydrogenation. Reaction pathways leading to the formation of these by-products were postulated. The first step is Ni- and Co-catalysed isomerisation of the imine R1-CH=N-CH2-R2 to R2-CH=N-CH2-R1, which occurs under conditions of catalytic hydrogenation, and even at lower temperature when dehydrogenation reactions
- This paper deals with a study of the hydrogenation of N-substituted aliphatic aldimines, especially in the relation between a heterogeneous hydrogenation catalyst and the formation of by-products. It was found that Pd and Pt catalysts exhibit high selectivity for the hydrogenation of aliphatic aldimines of the type R1-CH=N-CH2-R2 to the corresponding amine R1-CH2-NH-CH2-R2, while the selectivity of Ni and Co catalysts is substantially lower. When hydrogenation is catalysed by Ni and Co, then the predominant products, besides R1-CH2-NH-CH2-R2, are symmetric amines R1-CH2-NH-CH2-R1 and R2-CH2-NH-CH2-R2. The reaction mixtures also contain R1-CH=N-CH2-R1, R2-CH=N-CH2-R2 and R2-CH=N-CH2-R1 during hydrogenation. Reaction pathways leading to the formation of these by-products were postulated. The first step is Ni- and Co-catalysed isomerisation of the imine R1-CH=N-CH2-R2 to R2-CH=N-CH2-R1, which occurs under conditions of catalytic hydrogenation, and even at lower temperature when dehydrogenation reactions (en)
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| Title
| - Catalytic and mechanistic aspects of the hydrogenation of N-substituted aliphatic aldimines over solid catalysts
- Katalytické a mechanistické aspekty hydrogenace N-substituovaných alifatických aldiminů na heterogenních katalyzátorech (cs)
- Catalytic and mechanistic aspects of the hydrogenation of N-substituted aliphatic aldimines over solid catalysts (en)
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| skos:prefLabel
| - Catalytic and mechanistic aspects of the hydrogenation of N-substituted aliphatic aldimines over solid catalysts
- Katalytické a mechanistické aspekty hydrogenace N-substituovaných alifatických aldiminů na heterogenních katalyzátorech (cs)
- Catalytic and mechanistic aspects of the hydrogenation of N-substituted aliphatic aldimines over solid catalysts (en)
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| skos:notation
| - RIV/60461373:22310/07:00018617!RIV08-MSM-22310___
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22310/07:00018617
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - N-alkylaldimine reactions; isomerisation; hydrogenation; transamination; transimination; heterogeneous catalysis; surface-adsorbed species; palladium; platinum; nickel; cobalt (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
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| http://linked.open...n/vavai/riv/zamer
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| http://localhost/t...ganizacniJednotka
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