Comp. 1

Ar

n

Conventional

(ethyl ether)

Ultrasonic irradiation

Sonicator (HIU)

Time

(min)

Yield

(%)

Time

(min)

Yield

(%)

a

C₆H₅

2

25

34

2

85

b

4-CH₃C₆H₄

2

30

36

1

87

c

4-ClC₆H₄

2

29

32

1

91

d

2-ClC₆H₄

2

25

25

2

94

e

3-ClC₆H₄

2

30

42

1

88

f

4-NO₂C₆H₄

2

20

35

1

95

g

2,3-Cl₂C₆H₃

2

25

30

3

89

h

3,4-Cl₂C₆H₃

2

35

51

3

98

i

C₆H₅

3

25

50

2

87

j

3-ClC₆H₄

3

30

51

2

80

k

2,3-Cl₂C₆H₃

3

25

52

4

85

l

3,4-Cl₂C₆H₃

3

30

55

5

80