Table 1.

Crystallization solvents, melting points (M.P.), yield percentages, molecular (Mol.) formulae, and molecular weights (Wt.) of compounds 4a–l and 5a–d.

Compound No.	X/R	Crystallization Solvents	M.P. (°C)	Yield (%)	Mol. Formula (Mol. Wt.)
4a	H	EtOH/H2O	147–149	82	C17H17N3O3S (343.40)
4b	4-F	EtOH/H2O	135–137	84	C17H16FN3O3S (361.39)
4c	3-Cl	EtOH	143–145	77	C17H16ClN3O3S (377.85)
4d	4-Cl	EtOH	166–168	79	C17H16ClN3O3S (377.85)
4e	2-NO2	EtOH/CHCl3	211–213	88	C17H16N4O5S (388.40)
4f	3-NO2	EtOH/CHCl3	181–183	85	C17H16N4O5S (388.40)
4g	4-NO2	EtOH/CHCl3	222–224	92	C17H16N4O5S (388.40)
4h	2-CF3	EtOH/H2O	220–222	90	C18H16F3N3O3S (411.40)
4i	3-CF3	EtOH/H2O	206–208	86	C18H16F3N3O3S (411.40)
4j	2,4-F2	EtOH	169–171	92	C17H15F2N3O3S (379.38)
4k	2,5-F2	EtOH	212–214	90	C17H15F2N3O3S (379.38)
4l	2,4-Cl2	EtOH	227–229	94	C17H15Cl2N3O3S (412.29)
5a	C6H5	EtOH	151–153	85	C21H24N4O3S (412.51)
5b	4-FC6H4	EtOH	118–120	78	C21H23FN4O3S (430.50)
5c	C6H5CH2	EtOH/H2O	121–123	75	C22H26N4O3S (426.53)
5d	2-CF3C6H4CH2	EtOH	141–143	89	C23H25F3N4O3S (494.53)