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Expired
Application number
GB18910/37A
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IG Farbenindustrie AG
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IG Farbenindustrie AG
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Application filed by IG Farbenindustrie AGfiledCriticalIG Farbenindustrie AG
Publication of GB498405ApublicationCriticalpatent/GB498405A/en
Low-Molecular Organic Synthesis Reactions Using Catalysts
(AREA)
Abstract
2 : 21 - Dimethyl - 4 : 41 - dihydroxy - p - phenan throlin is manufactured by heating a p-phenylene-bis-b -aminocrotonic acid alkyl ester in the presence of a diluent. The product is useful as an initial material for chemical syntheses. In an example, 1 : 4-phenylene-bis-b -aminocrotonic acid ethyl ester is introduced into paraffin oil heated to 270 DEG C.
GB18910/37A1936-07-081937-07-07Process for the manufacture of 2.2-dimethyl-4.4-dihydroxy-p-phenanthrolin
ExpiredGB498405A
(en)