Table 1 Effect of different amounts of catalyst, temperature, ultrasonic and solvent (5 mL) in the synthesis of dihydropyrano[3,2-b]pyran.

From: Ultrasound-assisted synthesis of kojic acid-1,2,3-triazole based dihydropyrano[3,2-b]pyran derivatives using Fe3O4@CQD@CuI as a novel nanomagnetic catalyst

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Entry

Solvent

Temp. (°C)

Catalyst (mg)

Time (min)

Yield %

1

EtOH

Reflux

6

60

70

2

H2O

Reflux

6

60

43

3

n-Hexane

Reflux

6

60

Trace

4

Ethyl acetate

Reflux

6

60

24

5

CH3CN

Reflux

6

60

18

6

EtOH, H2O (1:1)

Reflux

6

5

42

7

EtOH, H2O (2:1)

Reflux

6

5

80

8

EtOH, H2O (2:1)

r.t. US

6

5

60

9

EtOH, H2O (2:1)

50, US

6

5

90

10

EtOH, H2O (2:1)

70, US

6

5

90

11

EtOH, H2O (2:1)

50, US

10

5

90

12

EtOH, H2O (2:1)

50, US

3

5

86

  1. Significant values are in bold.
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