Synthesis of diallylmethylamine from lower concentration methylamine water solution and allylchloride has been performed using polyglycol-400(PEG-400) as phase transfer catalyst. The results show that the reaction tim...Synthesis of diallylmethylamine from lower concentration methylamine water solution and allylchloride has been performed using polyglycol-400(PEG-400) as phase transfer catalyst. The results show that the reaction time can be efficiently shortened and product yield can be significantly increased. The orthogonal experimental method has been used to optimize the experiment conditions. The optimal condition are as follows:PEG-400 phase transfer catalyst, mole ratios of allylchloride∶methylamine=2.2∶1, the two periods of reaction temperature and time 20 ℃(1 h) and 60 ℃(6 h), diallylmethylamine is obtained in 75.6% yield. The product is characterized by IR, GC-MS and 1H NMR.展开更多
The effective B acid amount of dealuminated USY(DUSY) zeolites with different silica/alumina ratios were measured by UV spectrometry with 2,6 dimethyl pyridine as adsorbentes in the presence of cyclohexane or anhydrou...The effective B acid amount of dealuminated USY(DUSY) zeolites with different silica/alumina ratios were measured by UV spectrometry with 2,6 dimethyl pyridine as adsorbentes in the presence of cyclohexane or anhydrous ethanol or tetrahydrofuran.The isomerization of α pinene was used to check the acidic catalytic properties of these zeolites.The results indicate that effective B acid amount of DUSY measured in polar anhydrous ethanol or tetrahydrofuran is lower than that of non polar cyclohexane.The effect of solution concentration of effective B acid amount of DUSY zeolites is small.As the silica/alumina ratio of catalyst increases,effective B acid amount and conversion of isomerization of α pinene all raise.展开更多
The title compound, a fine artificial sweetener of high sweetness and low caloricity, has been synthesized using β-pinene from turpentine oil as raw material by 4-step reactions: epoxidation, isomerization, oxidation...The title compound, a fine artificial sweetener of high sweetness and low caloricity, has been synthesized using β-pinene from turpentine oil as raw material by 4-step reactions: epoxidation, isomerization, oxidation and oximation. The product was obtained with 99% purity in total yield of 22.5%.展开更多
文摘Synthesis of diallylmethylamine from lower concentration methylamine water solution and allylchloride has been performed using polyglycol-400(PEG-400) as phase transfer catalyst. The results show that the reaction time can be efficiently shortened and product yield can be significantly increased. The orthogonal experimental method has been used to optimize the experiment conditions. The optimal condition are as follows:PEG-400 phase transfer catalyst, mole ratios of allylchloride∶methylamine=2.2∶1, the two periods of reaction temperature and time 20 ℃(1 h) and 60 ℃(6 h), diallylmethylamine is obtained in 75.6% yield. The product is characterized by IR, GC-MS and 1H NMR.
文摘The effective B acid amount of dealuminated USY(DUSY) zeolites with different silica/alumina ratios were measured by UV spectrometry with 2,6 dimethyl pyridine as adsorbentes in the presence of cyclohexane or anhydrous ethanol or tetrahydrofuran.The isomerization of α pinene was used to check the acidic catalytic properties of these zeolites.The results indicate that effective B acid amount of DUSY measured in polar anhydrous ethanol or tetrahydrofuran is lower than that of non polar cyclohexane.The effect of solution concentration of effective B acid amount of DUSY zeolites is small.As the silica/alumina ratio of catalyst increases,effective B acid amount and conversion of isomerization of α pinene all raise.
文摘The title compound, a fine artificial sweetener of high sweetness and low caloricity, has been synthesized using β-pinene from turpentine oil as raw material by 4-step reactions: epoxidation, isomerization, oxidation and oximation. The product was obtained with 99% purity in total yield of 22.5%.
