A Simple and Green Procedure for the Synthesis of 5-Arylidenerhodanines Catalyzed by Diammonium Hydrogen Phosphate in Water

Table 1

Effect of different reaction conditions on synthesis of 5-arylidenerhodanines^a.

Entry	(NH4)2HPO4 (mol%)	Temperature (°C)	Time (min)	Yield (%)^b
1	10	80	45	85
2	10	90	18	86
3	10	100	18	86
4	0	90	60	0
5	5	90	18	75
6	20	90	18	86

aReaction condition: 2,4-dichlorobenzaldehyde (2.5 mmol), rhodanine (2.5 mmol), and water (3 mL).
bIsolated yield.