| 摘要 |
NEW MATERIAL:The compound of formula I (R1-R8 are lower alkyl; R9 is H or lower alkyl). EXAMPLE:1,1,5,5-Tetra-(p-dimethylaminophenyl)-3-p-toluenesulfinyl-1,4- pentadiene. USE:An electron-donative color developing agent. Its color-developed part absorbs light of near infrared region and the developed color can be read with an image reading apparatus using general-purpose semiconductor laser. PREPARATION:The objective compound can be produced by adding a small amount of acetic acid to a tetra(dialkylaminophenyl)cyanine compound of formu la II (A<-> is anion), a substituted benzenesulfinic acid salt of formula III (X is Na, K or Li) and a catalyst, boiling and refluxing the mixture in an organic solvent, cooling the product, separating precipitated crystal by filtration and washing the crystal with water and an organic solvent. |
