Comp.

Amount of catalyst (g)

T (˚C)

Solvent (mL)

Yield (%)^a

Time (h)^b

2a

0.1

r.t.

Solvent free

24

4.15

2a

0.1

100

Solvent free

24

3

2a

0.1

Reflux

H₂O (10)

30

3.5

2a

0.1

Reflux

EtOH (10)

35

3

2a

0.1

Reflux

CH₃CN (10)

45

2

2a

0.05

Reflux

CH₃CN (10)

53

2

2a

0.025

Reflux

CH₃CN (10)

43

3.5

2a

With Al₂O₃ (0.05 g)

Reflux

CH₃CN (10)

51

3

2a

With KF (0.05 g)

Reflux

CH₃CN (10)

55

3.5

2a

With mixture of

Al₂O₃-KF (0.05 g)

Reflux

CH₃CN (10)

53

2