反应详情

3-Methyl-1-phenylpyrazolin-5-one (1.045 g) was mixed with 2.03 g (0.006 mol) 2-methylthio-5-chloro-3-(3'-sulfopropyl)benzothiazolium, inner salt in 50 ml methanol. Triethylamine (0.62 g) was added. The mixture was stirred for one hour, the solvent evaporated, and the residue dissolved in isopropanol. The resulting solution was treated with 0.6 g KOAc in methanol to precipitate the dye. Filtering yielded 2.17 g (72%), mp 271°-276° C., λmax=383 (ε=19,000).

1. customthe solvent evaporated
2. dissolutionthe residue dissolved in isopropanol
3. additionThe resulting solution was treated with 0.6 g KOAc in methanol
4. customto precipitate the dye
5. filtrationFiltering
6. customyielded 2.17 g (72%), mp 271°-276° C., λmax=383 (ε=19,000)