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moonface551捐助貴賓 (小有名氣)
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[求助]
文章修回 求助一個問題,大家?guī)兔Π。?
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審稿人提出一個問題:The structure elucidation based on the 2D NMR also did not unambiguously determine the position of the methoxy. 我的回答入下,希望大家給看看我的英文表達(dá)是否正確清楚 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. 圖省略了 中間我想表達(dá),HMBC譜中甲氧基的氫與哪個C有相關(guān),就說明甲氧基連接在哪個C上,間隔3個鍵的相關(guān)最強(qiáng)。 [ Last edited by moonface551 on 2012-12-18 at 15:35 ] |
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