Compound

R

Temperature, ˚C

Time (h)

Flash mixture, petroleum ether-ethylacetate

Yield (%)

1

3,4-(MeO)₂C₆H₃

50

3

5:1

76

2

3,4,5-(MeO)₃C₆H₂

70

6

10:1

16

3

4-(CF3)C₆H₄

70

3

20:1

35

4

1-naphtyl

50

6

10:1

76

5

CH=CHPh

50

3

10:1

36

6

2-furyl

50

3

10:1

34

7

2-thienyl

50

3

10:1

35

8

2-pyridyl

50

6

5:1

17

9

3-pyridyl

50

6

3:1

33

10

4-pyridyl

50

6

3:1

17

11

ferrocenyl

70

6

10:1

6

11^a

ferrocenyl

70

6

10:1

28