- METHOD FOR THE PRODUCTION OF ISOPHORONDIAMINE (IPDA, 3-AMINOMETHYL-3,5,5-TRIMETHYLCYCLOHEXYLAMINE) HAVING A HIGH CIS/TRANS-ISOMER RATIO
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The invention relates to a method for the production of 3 aminomethyl-3,5,5- trimethylcyclohexylamine (isophorondiamine, IPDA) which has a high cis/trans isomer ratio. IPDA having a cis/trans isomer ratio in the range of 63/37 - 66/34 can be obtained in a temperature-independent manner by reacting IPDA having any particular cis/trans isomer ratio with H2 and NH3 in the presence of a hydrogenating catalyst. IPDA having a cis/trans isomer ratio of at least 73/27, which is an important starting material for the synthesis of polyurethanes and polyamides, can be obtained by combining said isomerization method with distillation methods.
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Page/Page column 12-13
(2008/06/13)
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- Tetracyclic benzimidazole derivatives and combinatorial libraries thereof
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The present invention relates to novel tetracyclic benzimidazole derivative compounds of the following formula: wherein R1to R10have the meanings described in here. The invention further relates to combinatorial libraries containing two or more such compounds, as well as methods of preparing tetracyclic benzimidazole derivative compounds.
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