The ring opening reaction of methyloxirane(PO) in hydrochloric acid(HCl) has been studied by NMR and gas chromatography. It is found that under experimental conditions α and β chloropropanol in the reaction products...The ring opening reaction of methyloxirane(PO) in hydrochloric acid(HCl) has been studied by NMR and gas chromatography. It is found that under experimental conditions α and β chloropropanol in the reaction products were in a molar ratio of about 2∶1. The ratio was almost constant when the molar ratio of c PO ∶c HCl ranged from 1∶0 3 to 1∶1 4, at reaction temperature from 0 to 65 ℃ and reaction time from 1 to 60 min. It is proposed that the addition reaction of HCl should follow an S N2 mechanism, and that which carbon atom would be attacked by nucleophilic agent Cl - is decided by space factor and not by the electron factor.展开更多
通过有机酸对β分子筛进行脱铝改性,采用XRD,BET,NH3-TPD,FTIR,27Al MAS NMR等手段对酸脱铝β分子筛样品进行表征,以乙基环己烷(ECH)为模型化合物考察环烷烃开环反应的性能。结果表明:随脱铝率的增加,β分子筛的相对结晶度、酸量、比表...通过有机酸对β分子筛进行脱铝改性,采用XRD,BET,NH3-TPD,FTIR,27Al MAS NMR等手段对酸脱铝β分子筛样品进行表征,以乙基环己烷(ECH)为模型化合物考察环烷烃开环反应的性能。结果表明:随脱铝率的增加,β分子筛的相对结晶度、酸量、比表面积等均呈现先增加后降低的趋势;反应活性、丙烯收率及丙烯选择性也出现先增加后降低的趋势,但乙烯收率变化幅度较小,当脱铝率为41.7%时ECH开环反应性能最优。展开更多
Five mono cycle β Lactams’ structures were optimized by semi empirical AM1 method of quantum chemistry.The ring opening reaction mechanism of mono cycle β Lactams in the presence of base were studied.The geometric ...Five mono cycle β Lactams’ structures were optimized by semi empirical AM1 method of quantum chemistry.The ring opening reaction mechanism of mono cycle β Lactams in the presence of base were studied.The geometric configurations of reaction transition states and reaction products were calculated.At the same time,the law of electronic transference in reaction was found.展开更多
文摘The ring opening reaction of methyloxirane(PO) in hydrochloric acid(HCl) has been studied by NMR and gas chromatography. It is found that under experimental conditions α and β chloropropanol in the reaction products were in a molar ratio of about 2∶1. The ratio was almost constant when the molar ratio of c PO ∶c HCl ranged from 1∶0 3 to 1∶1 4, at reaction temperature from 0 to 65 ℃ and reaction time from 1 to 60 min. It is proposed that the addition reaction of HCl should follow an S N2 mechanism, and that which carbon atom would be attacked by nucleophilic agent Cl - is decided by space factor and not by the electron factor.
文摘通过有机酸对β分子筛进行脱铝改性,采用XRD,BET,NH3-TPD,FTIR,27Al MAS NMR等手段对酸脱铝β分子筛样品进行表征,以乙基环己烷(ECH)为模型化合物考察环烷烃开环反应的性能。结果表明:随脱铝率的增加,β分子筛的相对结晶度、酸量、比表面积等均呈现先增加后降低的趋势;反应活性、丙烯收率及丙烯选择性也出现先增加后降低的趋势,但乙烯收率变化幅度较小,当脱铝率为41.7%时ECH开环反应性能最优。
文摘Five mono cycle β Lactams’ structures were optimized by semi empirical AM1 method of quantum chemistry.The ring opening reaction mechanism of mono cycle β Lactams in the presence of base were studied.The geometric configurations of reaction transition states and reaction products were calculated.At the same time,the law of electronic transference in reaction was found.
