6-甲氧基-7-羟基香豆素的H-4信号是A. 7. 60 (1H, J= 9. 5Hz) B. 6. 85 (1H, d, J= 9. 5Hz) C.6.26

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问题 6-甲氧基-7-羟基香豆素的H-4信号是

选项 A.

7. 60 (1H, J= 9. 5Hz)
B.

6. 85 (1H, d, J= 9. 5Hz)
C.

6.26 (1H, J = 9. 5Hz)
D.

3. 95 (1H, d, J=9. 5Hz)
E.

6. 91 (1H, d, J =9. 5Hz)

答案A

解析

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