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The kinetics of the reduction of the lipophilic quinone avarone by n-alkyl-1,4-dihydronicotinamides of various lipophilicities
(Serbian Chemical Soc, Belgrade, 1999)
Several NADH model compounds, N-alkyl-1,4-dihydronicotinamides, some of them possessing amphiphilic properties, have been synthesized, and the kinetics of their reaction with a biologically active liphophilic quinone, ...
Structure and reactivity of steroidal quinones
(Journal of the Serbian Chemical Society, 1997)
The preparation of substituted steroidal A-ring 1,4-quinones by nucleophilic addition results in pronounced regioselectivity at C(2), as confirmed by the X-ray analysis of 2-methoxy-2,5(10)-diene-1,4,17-trione. Conformational ...
Oxidation of steroidal 5-en-3β-ols with Jones reagent in ether
(Steroids, 1994)
The two-phase oxidation of steroidal 5-en-3β-ol (via 5-en-3-ones) into corresponding 4-en-3,6-diones in diethyl ether with Jones reagent was investigated. It was found that the system Jones reagent/diethyl ether enables ...
Thallium-containing mineral systems. Part II: thallium and silver sulfosalts with applications to polymetallic ores
(Chemie der Erde-geochemistry, 1993)
An experimental program was initiated to study the formation of Tl-sulfosalts in comparison with silver. This process is controlled by the activity of arsenic and/or antimony and/or bismuth contents. Generally thallium ...
Experimental investigation of the Ag-TI-Bi-Sb-S system
(Mineralogy and Petrology, 1995)
Polymetallic ore deposits of low temperature origin often contain thallium as a minor element. By means of modern analytical methods numerous new T1 minerals are described, but their coexistence and equilibria are not ...
Bilirubin determination in gallstones
(Fresenius' Journal of Analytical Chemistry, 1991)
The determination of bilirubin in gallstones is carried out by means of several methods, but most frequently by spectrophotometric determination of azobilirubin. We found that most of the methods were not applicable to ...
Cation-pi interaction with transition-metal complex as cation
(Elsevier Science Bv, Amsterdam, 1999)
A novel type of cation-pi interaction, where a transition-metal complex cation interacts with a pi-system, is predicted here. The theoretical calculations on the [Co(NH3)(6)](3+)-C6H6 system presented demonstrate that a ...
Sesquiterpene lactones from the Yugoslavian wild growing plant families Asteraceae and Apiaceae
(Serbian Chemical Soc, Belgrade, 1999)
Semisynthesis of Taxol (R): an improved procedure far the isolation of 10-deacetylbaccatin III
(Serbian Chemical Soc, Belgrade, 1999)
From the needles of domestic yew, (Taxus baccata), 10-deacetylbaccatin III (10-DAB) call be isolated in quantities of up to 297 mg per kg of fresh needles. Additional quantities of 10-DAB call be obtained from the extract ...
Mechanism of oxidation of 1-benzyl-1,4-dihydronicotinamide by the biologically active p-benzoquinone derivative, avarone, in a cationic micellar medium. An electrochemical approach
(Bioelectrochemistry and Bioenergetics, 1991)
The electrochemical reduction of avarone (Q), an antitumor sesquiterpenoid quinone, was investigated at various pH in aqueous ethanol containing a cationic surfactant, cetyltrimethylammonium bromide (CTAB) by cyclic and ...