| | 1 | Author
| Erich Ziegler, OttoS. Wolfbeis, Iris Trummer, Frau Prof, Dr, MagHelga Et, Wittmann | Requires cookie* | | | Title
| Eine Methode zur C-Methylierung cyclischer /3-Dicarbonyl-Verbindungen A Method for the C-Methylation of Cychc /9-Dicarbonyl Compounds  | | | | Abstract
| Cyclic /5-dicarbonyl compounds (1, 4, 7, 10) were reacted with either aniline or urea in the presence of trimethoxymethane to give the enamines 2, 5, 8 and 11, resp. The latter were reduced with hydrogen over palladium-charcoal or with the dimethylamine-boron-hydride complex to give the C-methylated /3-dicarbonyl compounds 3, 6, 9 and 12, resp. in moderatly to good overall yields. | | | |
Reference
| (Z. Naturforsch. 37b, 105—107 [1982]; eingegangen am 20. Juli 1981) | | | |
Published
| 1982 | | | |
Keywords
| Enamine Reduction, Catalytic Hydrogenation, Boron Hydride Reduction, C-Methylation | | | |
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| default:Reihe_B/37/ZNB-1982-37b-0105.pdf | | | | Identifier
| ZNB-1982-37b-0105 | | | | Volume
| 37 | |
| 2 | Author
| Carsten Schinzer3, RiyadhA. Saym, HassanM. Asfour0 | Requires cookie* | | | Title
| Hydrogenation of Toluene over Lao.sSro^Fej.xCoxO^ Perovskite Catalysts | | | | Abstract
| The hydrogenation of toluene over perovskites of composition Lao.gSro.iFei-x Cox0 3 _ z (x = 0.0, 0.2, 0.5, 0.8 and 1.0) is reported. The catalyst material has been prepared by the coprecipitation method using maleic acid as the complexing agent. The activity for the gas phase reaction of toluene and hydrogen at temperatures between 50 °C to 300 °C is reported for as-prepared and activated materials. The conversion has been found to be nearly temperature-independent over the as-prepared per ovskites with a maximum o f 40% conversion found for a composition Lao.8Sro.2Feo.5Coo.5O 2.86-Activation by an oxygen treatment at 500 °C was successful to enhance the activity of the Co-rich perovskites. All of these catalysts show a complete conversion of toluene at 100 °C, but activity decreases by time due to a reduction of the catalyst material. Again, Lao.8Sro.2Feo.5Coo.5O2.86 exhibits the slowest loss of activity. A model for its special properties is mainly attributed to the p-type conduction behaviour. The conversion behaviour of the perovskite type catalysts investigated here is compared to the results obtained with noble-metal supported catalysts and it can be concluded, that the perovskites exhibit higher conversion rates, maximum temperatures and higher cracking onset temperatures than these. | | | |
Reference
| Z. Naturforsch. 52b, 927—934 (1997); received April 11 1997 | | | |
Published
| 1997 | | | |
Keywords
| Perovskites, Mixed Metal Oxides, Stability, Catalytic Hydrogenation, Catalytic Reduction | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0927.pdf | | | | Identifier
| ZNB-1997-52b-0927 | | | | Volume
| 52 | |
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