2,7-DINITRO-9-DICYANOMETHYLENEFLUORENE-4-CARBOXYLIC ACID N-UNDECYLIC ESTER AS A SENSITIZING AGENT OF CARBAZOL-CONTAINING POLYMERS PHOTOCONDUCTIVITY AND 2,7-DINITROFLUORENONE-4-CARBOXYLIC ACID N-UNDECYLIC ESTER AS AN INTERMEDIATE COMPOUND IN ITS SYNTHESIS Russian patent published in 1995 - IPC

FIELD: organic chemistry, esters of aromatic and nitrocarboxylic acids. SUBSTANCE: diphenic acid is cyclized at 110-120 C with sulfuric acid to fluorenone-4-carboxylic acid which is nitrated without isolation by addition of nitric acid at 20-30 C to reaction mass, and 2,7-dinitrofluorenone-4-carboxylic acid is formed. The latter is esterified with n-undecylic alcohol in the presence of sulfuric acid, and 2,7-dinitro-9-dicyanomethylenefluorene-4-carboxylic acid n-undecylic ester is prepared. Use of synthesized compounds ensures to increase holographic sensitivity, to improve quality of diffuse object holograms. EFFECT: detection of compounds with increased activity. 3 cl, 1 tbl