糠酸(化學式:C5H4O3)是白色單斜長梭形結晶。1g糠酸可溶於26ml冷水或4ml沸水,易溶於乙醇和乙醚。在130-140℃(6.65-8kPa)升華。可用於合成甲基呋喃,糠醯胺及糠酸酯和鹽。在塑料工業中可用於增塑劑,熱固性樹脂等。在食品工業中用作防腐劑,也用作塗料添加劑、醫藥與香料等的中間體。由糠醛經空氣氧化而得。
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