申请人:Mathiaparanam Ponnampalam
公开号:US20070037989A1
公开(公告)日:2007-02-15
The invention teaches an improved process for the manufacture of useful fluoran dyes of the structure according to formula 1
comprising condensing in an alkanesulfonic acid or an arenesulfonic acid to acid according to formula 2
with an aminodiphenylamine of formula 3
wherein R, R
1
and R
2
are each independently selected from alkyl(C
1
-C
8
), aryl or aralkyl; wherein aromatic ring in aryl or aralkyl may be unsubstituted or substituted with alkyl(C
1
-C
8
), alkoxy(C
1
-C
8
), or halogen; wherein R
1
—N—R
2
may form pyrrolidinyl, piperidinyl and morpholinyl ring moieties;
wherein R
3
, R
4
, R
5
and R
6
are each independently selected from hydrogen, alkyl, cycloalkyl, alkoxy, halogen, aryl or aralkyl; wherein the aromatic ring in aryl or aralkyl may be unsubstituted or unsubstituted with alkyl, alkoxy or halogen; said alkyl or alkoxy moieties being from one to eight carbons; or R
3
and R
4
or R
4
and R
5
, or R
5
and R
6
, may form alicyclic or aromatic ring structures. Higher yields are achievable as compared with conventional processes.
该发明教导了一种改进的制造有用的芴染料的方法,其结构符合公式1,包括在烷基磺酸或芳香磺酸中,通过将公式2的酸与公式3的氨基二苯胺缩合而得到,其中R、R1和R2各自独立地选择自烷基(C1-C8)、芳基或芳基烷基;其中,芳基或芳基烷基中的芳环可能是未取代的,也可能用烷基(C1-C8)、烷氧基(C1-C8)或卤素取代;其中,R1—N—R2可能形成吡咯烷基、哌啶基和吗啉基环基;其中,R3、R4、R5和R6各自独立地选择自氢、烷基、环烷基、烷氧基、卤素、芳基或芳基烷基;其中,芳基或芳基烷基中的芳环可能是未取代的,也可能是用烷基、烷氧基或卤素取代的;所述烷基或烷氧基基团为一至八个碳;或R3和R4或R4和R5或R5和R6可以形成脂环或芳环结构。与传统方法相比,可以获得更高的产量。