| 摘要 |
PURPOSE: A process for preparing iminostilbene by high temperature dehydration is provided to obtain iminostilbene as an intermediate of 5-Carbamoyl-dibenz(b,f)azepin having anti-convulsive activity at a higher yield and conversion rate. CONSTITUTION: The process for preparing iminostilbene comprises high temperature dehydration of iminodibenzyl on the vapour phase with an iron oxide/potassium salt contact catalyst containing 35 to 90% by weight of an iron compound, calculated as Fe2O3, and 7 to 35% by weight of a potassium compound, calculated as K2O, as well as 0.0 to 3.5% by weight of a chromium compound, calculated as Cr2O3, and with or without conventional promoters. Suitable promoters are magnesium, calcium, cerium, molybdenum, cobalt, vanadium or tungsten compound.
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