“…[18] Thionyl chloride (3.47 mL, 48 mmol) was slowly added to a cooled solution of 4,4'-azobis(4-cyanopentanoic acid) (6.4 g, 23 mmol) and triethylamine (6.96 mL, 50 mmol) in di-chloromethane (20 mL), under nitrogen atmosphere. [18] Thionyl chloride (3.47 mL, 48 mmol) was slowly added to a cooled solution of 4,4'-azobis(4-cyanopentanoic acid) (6.4 g, 23 mmol) and triethylamine (6.96 mL, 50 mmol) in di-chloromethane (20 mL), under nitrogen atmosphere.…”