A series of diheterocyclic compounds containing 1,2,4-triazolo [1,5-a]pyrimidine and 1, 3,4-oxadiazole were designed and synthesized starting from 2-mercapto-5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine. The structure...A series of diheterocyclic compounds containing 1,2,4-triazolo [1,5-a]pyrimidine and 1, 3,4-oxadiazole were designed and synthesized starting from 2-mercapto-5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine. The structure of all compounds prepared were confirmed by H-1 NMR spectroscopy and elemental analysis. The preliminary bioassay indicated that the title compounds displayed good fungicidal activity against Rhizoctonia solani.展开更多
Four ferrocenyl long -chain alkyl β-diketonato zinc(Ⅱ) complexes with a general formulaZnL2 (L = C5H5FeC5an COCH COCnH2n+1.n= 6 - 9) were synthesized. These complexes were characterizedby elementary analysis, IR 1HN...Four ferrocenyl long -chain alkyl β-diketonato zinc(Ⅱ) complexes with a general formulaZnL2 (L = C5H5FeC5an COCH COCnH2n+1.n= 6 - 9) were synthesized. These complexes were characterizedby elementary analysis, IR 1HNMR MS. polarizing microscopy with a heating stage and DSC. It wasfound that the complexes have thermotropic liquid crystalline properties. The type of the heteronuclearliquid crystalline metal complexes have not been reported so far.展开更多
As we know,many scholars have been involved in the study of stochastic processes,whichhave a wide range of applications,such as the Markov processes.In the study of Markov pro-cesses,minimal Markov chain(i.e.the minim...As we know,many scholars have been involved in the study of stochastic processes,whichhave a wide range of applications,such as the Markov processes.In the study of Markov pro-cesses,minimal Markov chain(i.e.the minimal homogeneous denumerable Markov process)got most mature.One of the characteristics of this kind of processes is that the stay time展开更多
基金The project was supported by the NNSF of China (Grant No. 29802002) the NSF of Hubei Province the Dawn Plan of Science and Technology for Young Scientists of Wuhan City and Foundation for University Key Teacher by the Ministry of Education of China.
文摘A series of diheterocyclic compounds containing 1,2,4-triazolo [1,5-a]pyrimidine and 1, 3,4-oxadiazole were designed and synthesized starting from 2-mercapto-5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine. The structure of all compounds prepared were confirmed by H-1 NMR spectroscopy and elemental analysis. The preliminary bioassay indicated that the title compounds displayed good fungicidal activity against Rhizoctonia solani.
文摘Four ferrocenyl long -chain alkyl β-diketonato zinc(Ⅱ) complexes with a general formulaZnL2 (L = C5H5FeC5an COCH COCnH2n+1.n= 6 - 9) were synthesized. These complexes were characterizedby elementary analysis, IR 1HNMR MS. polarizing microscopy with a heating stage and DSC. It wasfound that the complexes have thermotropic liquid crystalline properties. The type of the heteronuclearliquid crystalline metal complexes have not been reported so far.
文摘As we know,many scholars have been involved in the study of stochastic processes,whichhave a wide range of applications,such as the Markov processes.In the study of Markov pro-cesses,minimal Markov chain(i.e.the minimal homogeneous denumerable Markov process)got most mature.One of the characteristics of this kind of processes is that the stay time
