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Éó¸åÈËÌá³öÒ»¸öÎÊÌ⣺The structure elucidation based on the 2D NMR also did not unambiguously determine the position of the methoxy.

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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 (¦Ä 3.78, 3H, s) with C-6' (151.6), H (¦Ä 3.90, 3H, s) with C-7' (154.2), H (¦Ä 3.86, 3H, s) with C-4 (154.4) and H (¦Ä 3.99, 3H, s) with C-7 (149.2). The results allowed four methoxy groups (methoxy protons at ¦Ä 3.78, ¦Ä 3.90, ¦Ä 3.86, ¦Ä 3.99) to be attached to C-6', C-7', C-4 and C-7, respectively.
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[ Last edited by moonface551 on 2012-12-18 at 15:35 ]
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