6-甲氧基-7-羟基香豆素的H-4信号是 A. 7. 60 (1H, J=

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问题 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 (1H, J = 9. 5Hz)D.

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

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

选项

答案A

解析

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