[EN] PREPARATION OF AN AMINOARYLAMINOARAZOLE<br/>[FR] PREPARATION D'AMINOARYLAMINOARAZOLE
申请人:THE DOW CHEMICAL COMPANY
公开号:WO1998024776A1
公开(公告)日:1998-06-11
(EN) An aminoarylaminoarazole can be prepared by a process comprising the steps of condensing a condensable nitroarylcarbonyl compound with an aminonitroarylol, an aminonitroarylthiol, or a triaminonitroarene to form a dinitroanilide, then reducing and cyclizing the dinitroanilide under such conditions to form the aminoarylaminoarazole. The aminoarylaminoarazole is useful in making PIBX polymers.(FR) L'invention concerne un procédé de préparation d'aminoarylaminoarazole comprenant les étapes consistant: à condenser un composé nitroarylcarbonyle condensable avec un aminonitroarylol, un aminonitroarylthiol, ou un triaminonitroarène pour former un dinitroanilide, puis à réduire et a soumettre à une cyclisation le dinitroanilide dans des conditions propices à la formation de l'aminoarylaminoarazole. Cet aminoarylaminoarazole est utile à la fabrication de polymères de polyimide benzoxazole, de polyimide benzothiazole, ou de polyimide benzimidazole.
Microwave-Enhanced On-Water Amination of 2-Mercaptobenzoxazoles To Prepare 2-Aminobenzoxazoles
a developed amination process. The reaction was completed in an hour at 100–150 °C in a microwave reactor without the use of external catalyst or additive. Key benefits of this process include an on-water reaction, short reaction time, being scalable and catalyst-free, and use of 2-mercaptobenzoxazoles as an inexpensive starting material having low environmental impact in its preparation.