General Electric Company

John E Corn, Jr

Jimmy Lynn Webb

Howard J Klopfer

Organic diamines can be prepared by hydrogenating a preformed diimine in the presence of methanol and in the further presence of the tertiary alkyl mono-amine used to make the diimino compound. The diamino compounds thus obtained are useful as catalysts in the preparation of polyphenylene oxide resins.

Reduction of diimino compounds to diamino compounds

Certain impurities found in 9,9-bis(4-hydroxyphenyl)-fluorene are removed by treatment of the latter with a methanol-water mixture and thereafter isolating the purified fluorene.

Purification of crude 9,9-bis-(4-hydroxyphenyl)-fluorene

Certain impurities found in 9,9-bis(4-hydroxyphenyl)-fluorene are removed by treatment of the latter with nitromethane in which the impurity is soluble, and thereafter isolating the purified fluorene.

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Mt. Vernon, IN, United States of America

John E Corn, Jr