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moonface551

捐助贵宾 (小有名气)

[求助] 文章修回 求助一个问题,大家帮忙啊!

审稿人提出一个问题:The structure elucidation based on the 2D NMR also did not unambiguously determine the position of the methoxy.

我的回答入下,希望大家给看看我的英文表达是否正确清楚
As far as we known, the position of the methoxy is usually determined by HMBC spectrum. The methoxy group was attached to which position according to the correlations of H (-OCH3) with which C. The correlation signal is the strongest when H and C are interval of three bonds. Here, we added an amplified HMBC spectrum (Figure S8) in supplementary material to illustrate this question. In Figure S8, there were strong correlations of H (δ 3.78, 3H, s) with C-6' (151.6), H (δ 3.90, 3H, s) with C-7' (154.2), H (δ 3.86, 3H, s) with C-4 (154.4) and H (δ 3.99, 3H, s) with C-7 (149.2). The results allowed four methoxy groups (methoxy protons at δ 3.78, δ 3.90, δ 3.86, δ 3.99) to be attached to C-6', C-7', C-4 and C-7, respectively.
图省略了
中间我想表达,HMBC谱中甲氧基的氢与哪个C有相关,就说明甲氧基连接在哪个C上,间隔3个键的相关最强。

[ Last edited by moonface551 on 2012-12-18 at 15:35 ]
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moonface551

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怎么没人呢,顶一下
2楼2012-12-18 15:55:05
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moonface551

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为什么没人帮忙
3楼2012-12-18 18:03:17
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moonface551

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好的,我取消求助,谢谢大家
6楼2012-12-18 21:22:30
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