Benzoin condensation reaction,as a mature reaction,has been widely used in chemical industry.Benzoin was produced by condensation of benzaldehyde with benzaldehyde as raw material and vitamin B1 as catalyst under the condition of pH=9～10,ethanol and 70℃constant temperature water bath.Thin-layer chromatography(TLC)was used to monitor the reaction and quantitative analysis of the yield of the reaction liquid by NMR hydrogen spectrometry.In this experiment,through the analysis of product spectra by infrared spectrum,GC-MS,1H NMR spectrum and 13C NMR spectrum,students can understand more deeply the theoretical knowledge of spectrum learned in organic chemistry and instrumental analysis courses.
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