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统编教材列举了醛、含醛基的糖、含醛基的酸、含醛基的酯等含醛基的物质能发生银镜反应,未提及不含醛基的其它有机物,能否发生银镜反应,笔者带着这个问题进行了多次实验,发现酚、胺也能发生银镜反应。苯酚的银镜反应在一洁净试管中,注入2毫升银氨溶液,滴入三滴苯酚溶液。放在盛水的烧杯中,水浴加热加至冒气泡时,溶液变为深灰色;至90℃时,出现银镜,移去酒消灯,静置片刻。倾去废液,即有一层光亮
According to the textbook, aldehyde-containing materials such as aldehydes, aldehyde-containing sugars, acids containing aldehyde groups, and esters containing aldehyde groups can undergo silver mirror reaction. No mention is made of other organic substances that do not contain aldehyde groups. The silver mirror reaction, the author conducted several experiments with this problem and found that phenol, amine can also occur silver mirror reaction. Silver mirror reaction of phenol In a clean test tube, inject 2 ml of a solution of silver ammonia and add three drops of phenol solution. In a beaker filled with water, when the water bath is heated and bubbled up, the solution turns dark gray; when it reaches 90°C, a silver mirror appears, and the wine disappears and is left standing for a while. Drain the waste, that is, there is a bright layer