The extraction of lactic acid(HA) with primary amine N1923(RNH 2) has been studied by means of a slope method and IR spectrophotometry at (298±1) K. The composition of the extracted complex was found to be RNH 2H...The extraction of lactic acid(HA) with primary amine N1923(RNH 2) has been studied by means of a slope method and IR spectrophotometry at (298±1) K. The composition of the extracted complex was found to be RNH 2HA. The equilibrium constant of extraction was determined as lg K ex = 1 63. The results showed that lower temperature was favorable for the extraction.展开更多
The C—H bond insertion reactions between benzyl methyl ether and CX 2(X=H, F, Cl) have been studied by using density functional theory at B3LYP/6 31G* level. The potential barriers for the C—H bond insertions in met...The C—H bond insertion reactions between benzyl methyl ether and CX 2(X=H, F, Cl) have been studied by using density functional theory at B3LYP/6 31G* level. The potential barriers for the C—H bond insertions in methyl group of benzyl methyl ether are 123.3 kJ/mol(X=Cl) and 240.4 kJ/mol(X=F), and those in benzyl group are 37.5 kJ/mol(X=Cl) and 112.2 kJ/mol(X=F) respectively. No potential barriers are present in both the insertion reactions with methylene group. The C—H bond insertion reactions between benzyl methyl ether and CX 2(X=H,F,Cl) take place primarily at α carbon of the benzyl group and the phenyl group promotes the C—H bond insertion by carbene at its neighboring α carbon more easily. [WT5HZ]展开更多
文摘The extraction of lactic acid(HA) with primary amine N1923(RNH 2) has been studied by means of a slope method and IR spectrophotometry at (298±1) K. The composition of the extracted complex was found to be RNH 2HA. The equilibrium constant of extraction was determined as lg K ex = 1 63. The results showed that lower temperature was favorable for the extraction.
文摘The C—H bond insertion reactions between benzyl methyl ether and CX 2(X=H, F, Cl) have been studied by using density functional theory at B3LYP/6 31G* level. The potential barriers for the C—H bond insertions in methyl group of benzyl methyl ether are 123.3 kJ/mol(X=Cl) and 240.4 kJ/mol(X=F), and those in benzyl group are 37.5 kJ/mol(X=Cl) and 112.2 kJ/mol(X=F) respectively. No potential barriers are present in both the insertion reactions with methylene group. The C—H bond insertion reactions between benzyl methyl ether and CX 2(X=H,F,Cl) take place primarily at α carbon of the benzyl group and the phenyl group promotes the C—H bond insertion by carbene at its neighboring α carbon more easily. [WT5HZ]
