A process for the preparation of 4,4'-dinitro-2,2'-di(trifluoromethyl)diphenyl ether according to the equation ##STR1## where X is F, Cl, Br or I, where the inorganic base is selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, and alkali metal bicarbonates, in the presence of a catalytic quantity of a benzoate catalyst. 2,8-Dinitro-6,6,12,12,-tetrafluoro-6H,12H-dibenzo[b,f][1,5]dioxocin, the corresponding diamine and polyimides formed from the diamine are also disclosed.
一种制备4,4'-二硝基-2,2'-二(三
氟甲基)
二苯醚的方法,根据以下方程式:##STR1## 其中X为F、Cl、Br或I,
无机碱选自碱
金属氢氧化物、碱
金属
碳酸盐和碱
金属氢
碳酸盐,存在
苯甲酸催化剂的催化量。还公开了2,8-二硝基-6,6,12,12,-四
氟-6H,12H-二苯并[b,f][1,5]二氧杂
环十二烷,相应的二胺和由二胺形成的聚
酰亚胺。