Xu Zhen-yuan
2003
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Journal
Dyestuffs and coloration
Abstract
3-Amino-9-ethylcarbazole was prepared from 3-nitro-9-ethylcarbazole by hydrogenation with modified Raney Ni catalyst. An optimum solvent was used, temperature was 100 ℃, and pressure was 1.2Mp. Increasing temperature shortened reaction time, but temperatures higher than 110 ℃ were unfavorable to product yields and catalyst recycling. In an experiment 20 times the volume of the original experiment, a conversion of 99.9% was achieved by hydrogenation within 2-2.5 hrs under optimum conditions.