Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Resonac Holdings Corp
Original Assignee
Showa Denko KK
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Filing date
Publication date
Application filed by Showa Denko KKfiledCriticalShowa Denko KK
Priority to JP367978ApriorityCriticalpatent/JPS5498753A/en
Publication of JPS5498753ApublicationCriticalpatent/JPS5498753A/en
NEW MATERIAL:3-Bromo-3-bromomethyl-6-ethoxycarbonyl-5,7-dimethylphthalide of formula I.
USE: An intermediate for 7-ethoxycarbonyl-4-hydroxymethyl-6,8-dimethyl-1-phthalazone that is effective in preventing disorders in arteriosclerosis and thrombosis.
PREPARATION: Bromine is made to act on 6-ethoxycarbonyl-3-hydroxy-3,5,7-trimethylphthalide of formula II in an adquate solvent to prepare the objective compound of formula I. The anhydrous condition increases the yield.