for 15 minutes 4 quinoline carboxaldehyde 2 6 g 16 5 mmol was added and the resulting mixture was heated on the steam bath for another hour upon cooling to 5 u00b0 c a precipitate formed this precipitate was recovered by filtration and then washed with water to provide 4 g of title compound m p 325 u00b0 328 u00b0 c analysis for c 13 h 8 n 2 os 2 calculated c 57 33 h 2 96 n 10 29 found c 57 11 h 3 11 n 10 21 one hundred and ninety grams 1 05 mol of diphenyl kerimine 140 grams 1 05 mol of rhodanine 5 ml of acetic acid and 1500 ml of toluene were heated at reflux for 3 hours crystals formed upon cooling the solvent was decanted fresh toluene was added to the residue and the resulting suspension was filtered the recovered crystals were recrystallized from methanol to provide 172 0 g of title product m p 192 u00b0 194 u00b0 c analysis for c 16 h 11 nos 2 calculated c 64 62 h 3 73 o 5 38 n 4 71 s 21 56 found c 64 13 h 3 84 0 5 57 n 4 59 s 22 38 a mixture of 9 9 g 50 0 mmol of 4 phenoxybenzaldehyde 6 8 g 51 1 mmol of rhodanine 15 5 g of sodium acetate and 60 ml of acetic acid was heated on a steam bath for two hours the reaction solution was then poured into water causing crude product to precipitate the precipitate was filtered and then washed successively with water followed by diethyl ether to provide 8 6 g of title product m p 195 u00b0 200 u00b0 c analysis.