The basic of spectroscopic methods

The 4-(2-[3,4-dimethoxyphenoxy] phenoxy) phthalonitrile was synthesized as the starting material of new syntheses. Zinc, copper, and cobalt phthalocyanines were achieved by reaction of starting compound with Zn(CH3 COO)2 , CuCl2 , and CoCl2 metal salts. Basic spectroscopic methods such as nuclear magnetic resonance electronic absorption, mass and infrared spectrometry were used in the structural characterization of the compounds. Absorption, excitation, and emission measurements of the fluorescence zinc phthalocyanine compound were also investigated in THF.

23p tudichquannguyet 29-11-2021 13 1   Download

Seven terpenoids were isolated from the dried leaves of Pinus dalatensis Ferré, including one caryolane sesquiterpenoid (1), five labdane diterpenoids (2, 3, 4, 5, 6) and one serratane triterpenoid (7). The structures of the isolated compounds were determined on the basic of spectroscopic methods (ESI-MS, NMR) and comparison with reported data. Among these compounds, the mixture of compounds 2 and 3 showed inhibitory effects on the growth of acute myeloid leukemia (OCI-AML) cells. This is the first report on the chemical compositions of Pinus dalatensis in Vietnam.

5p bautroibinhyen211 26-11-2018 31 0   Download

Phytochemical studied on methanol extract of fruits Fissistigma oldhami (Hemsl.) Merr. (Annonaceae) led to the isolation of four flavonoids: 6-hydroxy-5,7,8-trimethoxy flavanone, 2’,5’-dihydroxy-3’,4’,6’-trimethoxy chalcone, quercetin, rutin and two steroids: -sitosterol (5) and -sitosterol-3-O- -D-glucopyranoside (6). The structures of the compounds were established on the basic of spectroscopic methods (UV, IR, MS, 1D-NMR and 2D-NMR) and comparison with literature data. This is first time the 6 compounds isolated from the plant.

4p giesumanh 04-11-2018 66 0   Download