申请人:Mathiaparanam Ponnampalam
公开号:US20070073086A1
公开(公告)日:2007-03-29
The invention teaches novel process steps for the rapid high yield manufacture of diphenylamines of the formula
wherein R
1
is selected from hydrogen, alkyl, and aryl;
wherein each R
2
and R
3
is the same or different and each is independently selected from hydrogen, alkyl, alkoxy, aralkyl, dialkylamino, alkylarylamino and substituted or unsubstituted aryl, the substituents on aryl being each independently selected from alkyl (C
1
-C
8
), alkoxy (C
1
-C
8
), aroxy, aralkoxy and halogen; wherein n and m are each independently an integer from 1 to 5. Diphenylamines are key intermediates for the production of leuco dyes used in pressure-sensitive and heat-sensitive imaging systems. The process in at least one embodiment comprises reacting at elevated temperature an aryl halide with an aromatic amine in an organic solvent and aqueous alkaline solution and optionally in some embodiments, phase-transfer agent, followed by addition of catalytic amounts of bis[tri(t-butylphosphine)]palladium at a suitable temperature to rapidly form diphenylamine.
该发明教授了一种新颖的工艺步骤,用于快速高产量制造二苯胺,其化学式如下:其中R1为氢、烷基或芳基中选择;其中每个R2和R3相同或不同,且各自独立选择自氢、烷基、烷氧基、芳基烷基、二烷基胺、烷基芳基胺和取代或未取代的芳基,芳基上的取代基各自独立选择自烷基(C1-C8)、烷氧基(C1-C8)、芳氧基、芳基烷氧基和卤素;其中n和m各自独立为1至5之间的整数。 二苯胺是用于生产压敏和热敏成像系统中使用的偶氮染料的关键中间体。 该工艺至少在一种实施方式中包括在有机溶剂和水性碱性溶液中以升高温度反应芳基卤化物和芳胺,以及在一些实施方式中可选地加入相转移剂,然后在适当温度下加入催化量的叔丁基膦配体钯,以快速形成二苯胺。