Compounds No

R

Molecular formula

Melting point (˚C)

Color

Yield (%)

2a

H

C₂₂H₁₈N₂S

186

White

85

2b

4-NO₂

C₂₂H₁₇N₃O₂S

168

Yellow

71

2c

4-CF₃

C₂₃H₁₇F₃N₂S

182

White

73

2d

4-Cl

C₂₂H₁₇ClN₂S

150

Light yellow

78

2e

2,4-Cl

C₂₂H₁₆Cl₂N₂S

178

White

76

2f

4-F

C₂₂H₁₇FN₂S

160

Yellow

88

2g

4-CH₃

C₂₃H₂₀N₂S

164

White

81