Zobrazeno 1 - 10
of 130
pro vyhledávání: '"L. V. Spirikhin"'
Publikováno v:
Chemistry of Natural Compounds. 59:313-317
Publikováno v:
Journal of Applied Spectroscopy. 89:225-231
Autor:
G. F. Vafina, L. V. Spirikhin
Publikováno v:
Chemistry of Natural Compounds. 58:978-980
Publikováno v:
Journal of Applied Spectroscopy. 89:170-176
The structure of 5,5,6-trihydroxy-6-methyldihydropyrimidine-2,4(1Н,3Н)-dione in dimethyl sulfoxide was proved by 13С, 1Н, and 15N NMR spectroscopy. It was shown that this compound has a structure similar to 5,5,6-trihydroxy-6-methyldihydropyrimid
Publikováno v:
Chemistry of Natural Compounds. 53:887-890
The reaction of paeoniflorin (PF) with refluxing MeOH in the presence of cation exchanger KU-2-8 (H+) formed a mixture of the 4-O-methyl- and 4-oxo-9-O-methyl ethers (1:1, overall yield 90%) that were separated by chromatography over silica gel. The
Publikováno v:
Russian Journal of General Chemistry. 87:1097-1100
Alkylation of diethyl malonate and Meldrum acid with haloalkyl-1,3-dioxolanes has afforded the substituted malonates; their decarboxylation has led to the formation of esters containing a cycloacetal fragment. Reactions of the substituted malonates w
Publikováno v:
Вестник Башкирского университета. :345
Publikováno v:
Russian Journal of General Chemistry. 87:151-153
Synthesis of tri- and five-membered carboxylates are discussed. Microwave irradiation has been shown to stimulate the condensation of СН-acids with allyl chlorides. The selectivity of formation of target products was depending on the CH-acid struct
Publikováno v:
IOP Conference Series: Materials Science and Engineering. 848:012018
Functionalized nitrogen-containing polysaccharides based on available low molecular weight sample of carboxymethylcellulose (CMC) with a molecular mass of 90 thousand and mono-, di- and tri- ethanolamine were obtained. The study of CMC salts with eth
Publikováno v:
Chemistry of Natural Compounds. 50:1042-1046
New 1-hydroxy-1-en-3-one derivatives of 18β- and 18α-glycyrrhetic acids were synthesized via oxidation of the 3-ketotriterpenoids by atmospheric oxygen in the presence of an excess of t-BuOK. 2-Hydroxy-3,11-dioxo-18αH-olean-1,12-dien-30-oic acid e