怎么避免文献中没有详细说明，影响结果的操作，进 ...？ 文献如下：to a solution of 2-chloroethylamine hydrochloride (50 mmol,1 equiv) and magnesium sulfate (100 mmol, 2 equiv) in dichloromethane (125 ml) was added 4-methylbenzaldehyde (50 mmol, 1 equiv) and triethylamine (150 mmol, 3 equiv). the resulting mixture was stirred for 1 hour at room temperature,followed by filtration of mgso4 and evaporation of the solvent.diethyl ether (125 ml) was then added to the residue, and the precipitated hydrochloride salt was removed by filtration and washed with diethyl ether (2 × 30 ml). evaporation of the solvent afforded (e)-n-[(4-methylphenyl)methylidene]-2-chloroethylamine 2c in high purity ( 90% based on 1h nmr),which was used as such in the next step due to its instability. 为什么我过滤两遍在二氯甲烷还有晶体析出，估计是三乙胺和氯化氢的盐。如何避免？ 滤液过滤完澄清，把溶剂蒸完，为什么又有固体？怎么处理啊 反应过程见附件。 查看更多
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