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在2,6-二氯苯甲醛与盐酸羟胺反应时,由于醛基的邻位上有氯的存在,受空间位阻的影响,会降低反应的活性,因而当样品溶解后,需放置40min。乙醇作溶剂,溴酚兰作指示剂,以0.5mol/L NaOH标准液滴定。
When 2,6-dichlorobenzaldehyde is reacted with hydroxylamine hydrochloride, the presence of chlorine in the ortho-position of the aldehyde group will reduce the activity of the reaction due to the steric hindrance. Therefore, when the sample is dissolved, it needs to be left for 40 minutes. Ethanol as a solvent, bromophenol blue as an indicator to 0.5mol / L NaOH standard solution titration.