问题详情
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)
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7. 60 (1H, J= 9. 5Hz)
6. 85 (1H, d, J= 9. 5Hz)
6.26 (1H, J = 9. 5Hz)
3. 95 (1H, d, J=9. 5Hz)
6. 91 (1H, d, J =9. 5Hz)