Korea Kumho Petrochemical Co., Ltd.

Han Jin Kwag

Sang Ho Park

Jin-Eok Kim

Seoung-IL Kim

Youngchan Jang

Hyun-Kyung Sung

Provided is a method for preparing 4,4'-dinitrodiphenylamine (4,4&#x2032;-DNDPA) in high yield via the NASH reaction using a mixture of a bis-quaternary ammonium base and a base catalyst for the reaction of urea with nitrobenzene, and a method of preparing 4,4&#x2032;-bis(alkylamino)diphenylamine (4,4&#x2032;BAADA) in high yield and purity by hydrogenating the resulting 4,4&#x2032;-DNDPA with a ketone in the presence of hydrogen and hydrogenation catalyst. The catalyst complex used in the present invention allows easy recovery, provides superior alkaline stability and is capable of reducing production cost.

Method for preparation of 4,4'-dinitrodiphenylamine and 4,4&#x2032;-bis(alkylamino)diphenylamine with the base catalyst complex

Provided is a method of preparing 4,4'-dinitrodiphenylamine (4,4&#x2032;-DNDPA) in high yield by reacting 4-nitroaniline with excess nitrobenzene via the NASH reaction, and a method of preparing 4,4&#x2032;-bis(alkylamino)diphenylamine (4,4&#x2032;BAADA) in high yield and purity by hydrogenating the resulting 4,4&#x2032;-DNDPA with a ketone compound in the presence of hydrogen and hydrogenation catalyst. The disclosed process is simple, allows selective preparation of 4,4&#x2032;-DNDPA without byproducts, and thus allows preparation of 4,4&#x2032;-BAADA in high yield without a complicated purification procedure.

Method for preparation of 4,4'-dinitrodiphenylamine and 4,4&#x2032;-bis(alkylamino)diphenylamine by using 4-nitroaniline

The present invention relates to a method of preparing a copolymer having controlled gel content by polymerizing cyclic olefin compound by ROMP (Ring Opening Metathesis Polymerization), and more precisely, a method of preparing cyclic olefin copolymer with high yield, in which a complex prepared by mixing a W salt compound and an organoaluminum halide compound is used as a catalyst in the presence or absence of a molecular weight regulator, and a method of controlling gel formation by regulating the composition of cyclic olefin monomer composing a copolymer as shown in the following Empirical Formula 1 without using a reaction speed regulator or gel formation inhibitor. At this time, the cyclic olefin compound presented in the above Empirical Formula 1 is one or more compounds selected from a group consisting of dicyclopentadiene and compounds represented by the following Formula 1. 

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Daejeon, South Korea

Han Jin Kwag