Compounds

Structure

Aspect

Melting point (˚C)

Yield (%)

1a

Yellow solid

148 - 150

96

1b

Yellow solid

132 - 134

62

1c

Yellow solid

144 - 146

57

1d

Yellow solid

126 - 128

68

1e

Yellow solid

104 - 106

25

1f

Yellow solid

68 - 70

96

1g

Yellow solid

100 - 102

38