PM3 method has been used to calculate the electronic structures of isomers of Pyrrole,and to study the difference in insecticidal activities between isomers of pyrrole by atomic net charge,bond order and energy.
This essay analyses the unreliability of the existing criterion (ΔpK≥4、c 0K n≥10 -8 ),when employed in judging the feasibility of stepwise titration polybasic acids or bases,and the possible causes.A common and co...This essay analyses the unreliability of the existing criterion (ΔpK≥4、c 0K n≥10 -8 ),when employed in judging the feasibility of stepwise titration polybasic acids or bases,and the possible causes.A common and concrete criterion is obtained throungh accurate deductions.Verification tells that this new criterion is in good accordance with the practice.展开更多
文摘PM3 method has been used to calculate the electronic structures of isomers of Pyrrole,and to study the difference in insecticidal activities between isomers of pyrrole by atomic net charge,bond order and energy.
文摘This essay analyses the unreliability of the existing criterion (ΔpK≥4、c 0K n≥10 -8 ),when employed in judging the feasibility of stepwise titration polybasic acids or bases,and the possible causes.A common and concrete criterion is obtained throungh accurate deductions.Verification tells that this new criterion is in good accordance with the practice.
