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lialh4权威发布_制备lialh4(2024年11月精准访谈)

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lialh4

有机合成难题？四个技巧帮你搞定！ 𐟔 在有机合成中，选择正确的还原剂至关重要。LiAlH4能够还原nitrile、carbonyl、carboxylic acid和amide，而NaBH4则专一地还原carbonyl。H2则能够还原alkene、nitrile和carbonyl。 𐟓 观察碳原子数量的变化。当碳原子数量增加时，通常需要进行step up反应，例如Nu addition of carbonyl或Nu substitution of haloalkane。相反，当碳原子数量减少时，需要进行step down反应，如iodoform test或oxidation of terminal alkene。 𐟔„ 利用electrophilic addition形成的主产物打开pi bond，再进行elimination反应，可以改变C=C的位置。 𐟔— 通过分子内的intramolecular nucleophilic substitution形成cyclic structure。首先找出组成cyclic结构的原子，确定形状并给原子标上数字，然后逐个检查原本原子连接的取代基。

求助一下，这个方程式怎么配呀教我一下，这个方程式怎么配呀，试了很久都没有解出来，用尽各种方法了，他这里有两个氧化物，分别对应两个还原产物，怎么配平？

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