PEG coupled heterocyclic compound and application thereof in acidic bright copper plating

[0038] A PEG-coupled heterocyclic compound is 4,5-dihydrothiazole-2-mercaptopolyethylene glycol 1000, which is obtained by substitution reaction between PEG1000 and 4,5-dihydrothiazole-2-thiol, and its structural formula is as follows:

[0039]

[0040] The synthesis method of the 4,5-dihydrothiazole-2-mercaptopolyethylene glycol 1000 is as follows: PEG1000 (0.12 mol), 4,5-dihydrothiazole-2-thiol (0.1 mol) and triphenyl Phosphorus (0.1 mol) was dissolved in 400 ml of dry tetrahydrofuran, and diisopropyl azodicarboxylate (0.12 mol) was slowly added dropwise at a temperature of 20-30°C; when 4,5-dihydrothiazole-2- After the thiol was completely converted, the reaction was stopped; the reaction mixture was concentrated, and the product was purified by recrystallization from the remaining viscous liquid ether with a yield of 80%.

[0042] A PEG-coupled heterocyclic compound, which is 1H-benzo[d]imidazole-2-dithiopolyethylene glycol 4000, is composed of PEG4000 and 2-dithio-1H-benzo[d]imidazole through a substitution reaction Obtained, the structural formula is as follows:

[0043]

[0044] The synthesis method of the 1H-benzo[d]imidazole-2-dithio PEG4000 is as follows: PEG4000 (0.12 mol), 2-dithio-1H-benzo[d]imidazole (0.1 mol), triphenyl Phosphate (0.1 mol) was dissolved in 400 ml of dry THF, and diisopropyl azodicarboxylate (0.12 mol) was slowly added dropwise at a temperature of 20-30°C; when 2-dithio-1H-benzene After [d] imidazole was completely converted, the reaction was stopped; the reaction mixture was concentrated, and the remaining viscous liquid ether was recrystallized and purified to obtain the product with a yield of 80%.

[0046] A PEG-coupled heterocyclic compound as sodium 3-(2-(6-(PEG8000)benzo[d]thiazol-2-yl)dithio)propane-1-sulfonate modified with methylsulfonic acid PEG8000 and sodium 3-(2-(6-hydroxy-benzo[d]thiazol-2-yl)dithio)propane-1-sulfonate were obtained by substitution reaction, the structural formula is as follows:

[0047]

[0048] The synthesis method of the sodium 3-(2-(6-(PEG8000)benzo[d]thiazol-2-yl)dithio)propane-1-sulfonate is as follows: PEG8000 (0.12 mol), sodium 3-(2-(6-hydroxy-benzo[d]thiazol-2-yl)dithio)propane-1-sulfonate (0.1 mol), sodium hydroxide (0.1 mol), dissolved in In 400 ml of dry tetrahydrofuran, heat to reflux for three hours; when 3-(2-(6-hydroxy-benzo[d]thiazol-2-yl)dithio)propane-1-sulfonate sodium is completely converted , to stop the reaction; the reaction mixture was concentrated, and the remaining viscous liquid ether was recrystallized and purified to obtain the product with a yield of 80%.