Fluoran compounds and recording sheets containing them
申请人:KANZAKI PAPER MANUFACTURING CO., LTD
公开号:EP0155593A2
公开(公告)日:1985-09-25
Fluoran compounds of the structural formula:
wherein R1 is propyl or butyl, R2 is an alkyl of from one to four carbon atoms, R3 is methyl or ethyl, and R4 is hydrogen or methyl are particularly suitable for use in providing high quality pressure, heat or electrothermal sensitive recording sheets containing a color former in operative association with an electron-accepting substance.
The use of two biphenyl sulfonic acid ligands for the catalytic C-N cross coupling of arylhalides with anilines, 3-aminopyridine, and secondary amines is reported. Our results represent a significant improvement compared to state of the art methods especially with regards to the removal of palladium.