在N,N-二甲基乙酰胺(DMAc)和CH2Cl2体系中,取代苯甲酸(1a^1h)与SOCl2在0℃下反应20min后,接着加入苯乙胺在25℃下反应7h,得到了取代苯甲酸苯乙胺(2a^2h)。优化条件下,反应产率在84%~95%之间。2a^2h的结构经1 H NMR、13 C NMR、IR和MS确...在N,N-二甲基乙酰胺(DMAc)和CH2Cl2体系中,取代苯甲酸(1a^1h)与SOCl2在0℃下反应20min后,接着加入苯乙胺在25℃下反应7h,得到了取代苯甲酸苯乙胺(2a^2h)。优化条件下,反应产率在84%~95%之间。2a^2h的结构经1 H NMR、13 C NMR、IR和MS确证。提出了DMAc协同促进取代苯甲酸苯乙胺合成反应的机理。展开更多
Ascorbyl octyl aldehyde acetals are prepared from the reaction of ascorbic acid with octyl aldehyde using p-toluene sulfonic acid as catalyst,dimethyl acetamide as solvent,cyclohexane as dehydration agent. The acetals...Ascorbyl octyl aldehyde acetals are prepared from the reaction of ascorbic acid with octyl aldehyde using p-toluene sulfonic acid as catalyst,dimethyl acetamide as solvent,cyclohexane as dehydration agent. The acetals are obtained as a mixt. of two diastereomers(ratio,0.46∶0.54) based on the results of 1H-NMR spectroscopic analysis. The antioxidation activity of ascorbyl octyl aldehyde acetals in fresh tea seed oil is evaluated by peroxide value(POV) determination. The POV data show that ascorbyl octyl aldehyde acetals exhibits signifcant dose-effect relationship. The antioxidation activity of ascorbyl octyl aldehyde acetals is stronger than that of VC or PG but weaker than that of TBHQ,when their amount in fresh tea seed oil is respectively added according to the maximum allowed concentration as food additives in China.展开更多
文摘在N,N-二甲基乙酰胺(DMAc)和CH2Cl2体系中,取代苯甲酸(1a^1h)与SOCl2在0℃下反应20min后,接着加入苯乙胺在25℃下反应7h,得到了取代苯甲酸苯乙胺(2a^2h)。优化条件下,反应产率在84%~95%之间。2a^2h的结构经1 H NMR、13 C NMR、IR和MS确证。提出了DMAc协同促进取代苯甲酸苯乙胺合成反应的机理。
文摘Ascorbyl octyl aldehyde acetals are prepared from the reaction of ascorbic acid with octyl aldehyde using p-toluene sulfonic acid as catalyst,dimethyl acetamide as solvent,cyclohexane as dehydration agent. The acetals are obtained as a mixt. of two diastereomers(ratio,0.46∶0.54) based on the results of 1H-NMR spectroscopic analysis. The antioxidation activity of ascorbyl octyl aldehyde acetals in fresh tea seed oil is evaluated by peroxide value(POV) determination. The POV data show that ascorbyl octyl aldehyde acetals exhibits signifcant dose-effect relationship. The antioxidation activity of ascorbyl octyl aldehyde acetals is stronger than that of VC or PG but weaker than that of TBHQ,when their amount in fresh tea seed oil is respectively added according to the maximum allowed concentration as food additives in China.