Table 1 ¹³C and ¹H NMR data of pyrophen (1) in CDCl₃ (J in [Hz])

2

164.7

-

7-NHC OCH₃

170.3

-

3

88.0

5.43 (d, 2.2)

7-NHCOC H₃

22.3

1.95 (s)

4

171.0

-

8

38.1

3.09 (m)

4-OCH₃

55.7

3.73 (s)

1'

136.0

-

5

100.6

5.90 (d, 2.2)

2',6'

128.6

7.16 (m)

6

161.9

-

3',5'

128.2

7.25 (m)

7

52.3

4.98 (q, 7.8)

4'

126.5

7.21 (m)

7-NH COCH₃

-

7.79 (d, 8.4)