Based on the molecular polarizability effect index,a formula of three parameters was proposed to calculate the boiling point of aliphatic aldehydes and alkanones.ln（820.5-Tb）=6.38330-1.37357×10-1Nc+5.39350ΔE...Based on the molecular polarizability effect index,a formula of three parameters was proposed to calculate the boiling point of aliphatic aldehydes and alkanones.ln（820.5-Tb）=6.38330-1.37357×10-1Nc+5.39350ΔEPI+8.02603×10-2NWhere the Nc is the effective length of carbon chain of alkyl group in the aliphatic aldehydes and alkanones.The ΔPEI is the polarizability effect index difference between the corresponding branched and normal alkyl isomer containing the same carbon atom number,which expressed the effcet of carbonyl group on the boiling point of ali-phatic aldehydes and alkanones.N is the carbon numbers of aliphatic aldehydes and alkanones.展开更多
In this work the hydrolysis rate constants(k) of a series of Aliphatic esters in different concent of ethanol solution were studied by conductometry,and some correlative analysis were done about the relation among the...In this work the hydrolysis rate constants(k) of a series of Aliphatic esters in different concent of ethanol solution were studied by conductometry,and some correlative analysis were done about the relation among the molecular structure of a series of Aliphatic esters,thecondition of hydrolysis and hydrolysis rate constants(k).The quantificational mathematic equation:lgk=a+blg PEI(R)+clgε,among hydrolysis rate constants(k),the polarizability effect index(PEI) of alkyl group(R)and dielectric constant(ε) and this behavior was deduced.Simultaneously,the effect of FOS on hydrolysis rate constants(k) of Aliphatic esters in 39.9%(v/v) ethanol solution were measured in above meaning.The quantificational mathematic expression between hydrolysis rate constants(k) of ester and the concentration of FOS(M):k=k′/(1+AM),was deduced and validated.The result showed that FOS inhibited the hydrolysis reaction of Aliphatic esters.展开更多
Thermal analysis was employed to investigate the desorption temperatures(Td) of alcohols on the surface of α-Al2O3 and silicion gel in this paper.The quantative relationship between Td and boiling point(...Thermal analysis was employed to investigate the desorption temperatures(Td) of alcohols on the surface of α-Al2O3 and silicion gel in this paper.The quantative relationship between Td and boiling point(Tb),polarizability effect index(PEI)was:Td(℃)=2111+06185Tb(℃)-22868PEI (on α-Al2O3) with a correlation coefficient of 09986 and a standard deviation of 13246,Td(℃)=50585+04673Tb(℃)-29195PEI (on silica gel) with a correlation coefficient of 09937 and a standard deviation of 21877.展开更多
文摘Based on the molecular polarizability effect index,a formula of three parameters was proposed to calculate the boiling point of aliphatic aldehydes and alkanones.ln（820.5-Tb）=6.38330-1.37357×10-1Nc+5.39350ΔEPI+8.02603×10-2NWhere the Nc is the effective length of carbon chain of alkyl group in the aliphatic aldehydes and alkanones.The ΔPEI is the polarizability effect index difference between the corresponding branched and normal alkyl isomer containing the same carbon atom number,which expressed the effcet of carbonyl group on the boiling point of ali-phatic aldehydes and alkanones.N is the carbon numbers of aliphatic aldehydes and alkanones.
文摘In this work the hydrolysis rate constants(k) of a series of Aliphatic esters in different concent of ethanol solution were studied by conductometry,and some correlative analysis were done about the relation among the molecular structure of a series of Aliphatic esters,thecondition of hydrolysis and hydrolysis rate constants(k).The quantificational mathematic equation:lgk=a+blg PEI(R)+clgε,among hydrolysis rate constants(k),the polarizability effect index(PEI) of alkyl group(R)and dielectric constant(ε) and this behavior was deduced.Simultaneously,the effect of FOS on hydrolysis rate constants(k) of Aliphatic esters in 39.9%(v/v) ethanol solution were measured in above meaning.The quantificational mathematic expression between hydrolysis rate constants(k) of ester and the concentration of FOS(M):k=k′/(1+AM),was deduced and validated.The result showed that FOS inhibited the hydrolysis reaction of Aliphatic esters.
文摘Thermal analysis was employed to investigate the desorption temperatures(Td) of alcohols on the surface of α-Al2O3 and silicion gel in this paper.The quantative relationship between Td and boiling point(Tb),polarizability effect index(PEI)was:Td(℃)=2111+06185Tb(℃)-22868PEI (on α-Al2O3) with a correlation coefficient of 09986 and a standard deviation of 13246,Td(℃)=50585+04673Tb(℃)-29195PEI (on silica gel) with a correlation coefficient of 09937 and a standard deviation of 21877.
