Spectral method

In the further research and synthesis of hybrid molecules which exhibit highly biological activities, the synthesis of triazole-fused bicyclic heterocycles bearing the benzofuran has been undertaken. A facile, convenient and good yielding synthesis of novel benzofuran-bearing 1,2,4-trazole derivatives were described.

6p viprimi 16-12-2024 1 1   Download

To extract, isolate, determine the structure of compounds from Huperzia serrata (Thunb.) Trevis. Subjects and methods: The samples were collected in Tamdao National Park. The structure of substances was determined by spectral methods. Results and conclusions: 2 compounds of terpenoid group were isolated, namely: 3β, 21β, 29-trihydroxyserrat-14-en-24-oic acid-3β-yl- (7’-hydroxycinnamate); 16-oxo-3α-hydroxyserrat-14-en-21β-ol, the substances were confirmed by the structure of NMR, MS, HMBC, HSQC.

5p chauchaungayxua1 02-12-2019 10 1   Download

This thesis aimed to apply the SEM for dynamic analysis of cracked beam subjected moving harmonic force in the frequency domain. Namely, the frequency response of a cracked beam subjected to moving harmonic force is obtained explicitly and examined in dependence upon the load and crack parameters. This task is acknowledged herein spectral analysis of cracked beam subjected to moving load.

27p change00 04-05-2016 53 4   Download