魏甘德-洛溫菲爾德降解反應(Weygand-Löwenfeld degradation)指2,4-二硝基氟苯碳酸氫鈉溶液中反應,得到少一個碳的醛糖,同時生成2,4-二硝基苯酚氰化氫[1][2][3]

二氧化碳將反應生成的氰化氫帶走,收集並將其轉化為氰化銀,稱重,可知反應的進行程度。

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