Entry

Br₂ (eq.)

H₂O (eq.)

m (Br₂-H₂O)/mg

solvent

Yield/2a%^b

Yield/3a%^b

1

1

46.7

100

1,4-dioxane

58

5

2

1

46.7

100

THF

52

0

3

1

46.7

100

EtOAc

30

16

4

1

46.7

100

EtOH

39

29

5

1

46.7

100

MeCN

0

0

6

0.05

2.3

5

1,4-dioxane

30

0

7

0.1

4.6

10

1,4-dioxane

29

0

8

0.2

9.3

20

1,4-dioxane

86

0

9

0.3

14

30

1,4-dioxane

85

0

10

0.4

18.7

40

1,4-dioxane

68

0

11

0.6

28

60

1,4-dioxane

59

0

12

0.8

37.3

80

1,4-dioxane

58

0

13^c

0.2

9.3

20

1,4-dioxane

73

0

14^d

0.2

9.3

20

1,4-dioxane

28

58