Entry

Solvent

μ(D)⁶

ε_ρ/˚C

Yield^b(%)

3

4

1

DMSO

4.30

48.9/20

87

-

2

DMF

3.86

36.71/20

81

-

3

CH₃CN

3.44

37.5/20

73

-

4

2-Butanone

-

-

84

-

5

Acetone

2.69

20.70/25

82

-

6

2-Pyrrolidone

2.30

-

44

19

7

Ethyl Benzoate

1.99

5.98/25

-

72

8

Ethyl Acetate

1.88

6.02/20

-

81

9

THF

1.70

7.58/25

-

82

10

CHCl₃

1.15

4.90/20

-

60

11

CH₂Cl₂

1.14

9.10/20

-

72

12

Diethyl Ether

1.12

4.20/27

-

55

13

1,4-Dioxane

0.45

2.70/25

-

94

14

Toluene

0.40

2.24/20

-

52

15

Benzene

0

2.28/20

-

58