Skip to main content

Table 1 Assignment of the 1 H- 1 H correlation signals found in the two-dimension COSY spectra of the transformed production

From: Transformation of multi-component ginkgolide into ginkgolide B by Coprinus comatus

Chemical shift (ppm)

J (Hz)

Number of proton

Assignment a

1 H- 1 H COSY

7.46

d/5.0

1

10-OH (B)

H10 (B)

6.82

d/5.2

0.15

10-OH (A)

H10 (A)

6.47

s

1

3-OH (B)

 

6.38

s

0.15

3-OH (A)

 

6.07

s

1

H12 (B)

 

6.02

s

0.15

H12 (A)

 

5.30

d/4.0

1

H6 (B)

H7a, H7b (B)

5.02

d/5.0

1

H10 (B)

10-OH (B)

4.92

m

1

1-OH (B)

H1 (B)

1.14

H6, H10 (A)

H7, 10-OH (A)

4.83

dd/7.2,8.0

0.15

H2 (A)

H1a, H1b (A)

4.64

d/7.4

1

H2 (B)

H1 (B)

4.04

dd/3.0,7.4

1

H1 (B)

H2, 1-OH (B)

2.93

q/7.2

0.15

H14 (A)

H16 (A)

2.83

q/7.1

1

H14 (B)

H16 (B)

2.75

dd/7.2,15.2

0.15

H1a (A)

H1b, H2 (A)

2.15

m

1

H7a (B)

H7b, H8 (B)

2.02

m

1.14

H7 (A)

H8 (A)

1.96

m

1

H7b (B)

H6, H7a, H8 (B)

1.81

dd/8.0,15.2

0.15

H1b (A)

H1a, H2 (A)

1.72

m

1

H8 (B)

H7a, H7b (B)

0.15

H8 (A)

H7 (A)

1.11

m

3

H16 (B)

H14 (B)

0.51

H16 (A)

H14 (A)

1.03

s

9

H18, H19, H20 (B)

 

1.53

H18, H19, H20 (A)

  1. a(A): H assigned ginkgolide A; (B): H assigned ginkgolide B.