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Table 5 Synthesis of 7(a–j) by MTPPBr-PHTH-DES

From: The new phthalic acid-based deep eutectic solvent as a versatile catalyst for the synthesis of pyrimido[4,5-d]pyrimidines and pyrano[3,2-c]chromenes

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Entry

Aldehyde

Product

Time

(min)

Yield

(%)

M.P. °C

Found, literature

TON

TOF

1

7a

10

95

262-265,

256-257 [48]

95

9.50

2

7b

15

97

263-267,

266–268 [49]

97

6.46

3

7c

10

96

259-262,

264-267 [49]

96

9.60

4

7d

20

93

260-263,

256-258 [49]

93

4.65

5

7e

10

92

256-258,

261-263 [49]

92

9.20

6

7f

10

90

273-275,

259-261 [49]

90

9.00

7

7g

20

91

234-236,

230-233 [50]

91

4.55

8

7h

25

85

230-233,

233-236 [50]

85

3.40

9

7i

20

88

248-252,

260–263 [51]

88

4.40

10

7j

25

89

220-224,

226-230 [48]

89

3.56