6-甲氧基_7 -羟基香豆素的甲氧基的质子信号是 A. 7. 60 (1H,

昕玥2019-12-17 24

问题 6-甲氧基_7 -羟基香豆素的甲氧基的质子信号是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D

解析

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