Table 2.

The results of Knoevenagel reactions between various rhodanine with aldehyde compounds.

Entry	Rhodaninea	Aldehydeb	Solvent	Time (h)	Conversion (%)c
1	1b	3a	DMSO	0.5	99
2	1b	3b	DMSO	0.5	99
3	1b	3c	DMSO	1.5	99
4	1b	3d	DMSO	0.5	98
5	1b	3e	DMSO	0.5	99
6	1c	3a	DMSO	1.5	98
7	1b	3a	MECN	0.75	98
8	1b	3a	DMF	0.5	99

The reactions were performed at 70 °C, [rhodanine] = [aldehyde] = 0.4 M, [TEA] = 0.1 M.

^aVarious rhodanine compounds in Fig. 4a.

^bVarious aldehyde compounds in Fig. 4a.

^cDetermined by ¹H NMR.