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Table 4 Comparative analysis of the catalytic properties of many of the catalysts mentioned in the text for producing 4a

From: Photochemical synthesis of pyrano[2,3-d]pyrimidine scaffolds using photoexcited organic dye, Na2 eosin Y as direct hydrogen atom transfer (HAT) photocatalyst via visible light-mediated under air atmosphere

Entry

Catalyst

Conditions

Time/Yield (%)

TON

TOF

References

1

[DABCO](SO3H)2(Cl)2

H2O, Reflux

10 min/86

17.2

1.7

[19]

2

[DABCO](SO3H)2(HSO2)2

H2O, 90 °C

7 min/90

45

6.4

[19]

3

B(OH)3

THF/H2O, Reflux

125 min/81

8.1

0.06

[24]

4

DBA

EtOH/H2O, Reflux

58 min/94

4.7

0.08

[27]

5

Zn[(L)proline]2

EtOH, Reflux

60 min/85

5

0.08

[35]

6

theophylline

H2O/EtOH, 50 °C

10 min/86

8.6

0.8

[36]

7

β-CD

H2O, 80 °C

10 min/93

9.3

0.9

[37]

8

Na2 eosin Y

Visible light irradiation, H2O/EtOH (2:1), rt

10 min/94

94

9.4

This study

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BMC Chemistry

ISSN: 2661-801X

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