he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral ...he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral fragmenta-tion behaviour of crown ethers are suggested. The EI mass spectra of studied crownethers are in satisfactory agreenient with the predictions.展开更多
The novel reversible anticholinesterase (anti-ChE) agent suberogorgin (S) has potent anti-ChE activity and lower toxicity and is possible to become the new drug for the treatment of senile dementia and amnesia. It has...The novel reversible anticholinesterase (anti-ChE) agent suberogorgin (S) has potent anti-ChE activity and lower toxicity and is possible to become the new drug for the treatment of senile dementia and amnesia. It has been found that the carboxyl, carbonyl groups and double bond of S are the main groups to produce the biological activity in our previous studies on its structure-activity relationships (SAR). In order to explore the relationship between the conformers and biological activity, we have studied the conformational characteris-展开更多
文摘he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral fragmenta-tion behaviour of crown ethers are suggested. The EI mass spectra of studied crownethers are in satisfactory agreenient with the predictions.
基金Project supported by the National Natural Science Foundation of China.
文摘The novel reversible anticholinesterase (anti-ChE) agent suberogorgin (S) has potent anti-ChE activity and lower toxicity and is possible to become the new drug for the treatment of senile dementia and amnesia. It has been found that the carboxyl, carbonyl groups and double bond of S are the main groups to produce the biological activity in our previous studies on its structure-activity relationships (SAR). In order to explore the relationship between the conformers and biological activity, we have studied the conformational characteris-