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Article
Investigation of membrane-active components from blood serum of patients with chronic renal failure
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Article
A study of complex mixtures of natural substances by the defocusing and DADI methods. III. Components of the protective secretion of the beetleCoccinella septempunctata
The composition of the protective secretion of the seven-spot ladybugCoccinella septempunctata L. (Coleoptera, Coccinellidae) has been studied by the methods of high- and low-resolution mass spectrometry. By dete...
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Article
The study of complex mixtures of natural substances by the defocusing and DADI methods. II. Phytosterols accompanying β-sitosterol
Low- and high-resolution mass spectra and defocusing and DADI spectra of samples of β-sitosterol isolated from various plant material have been studied. The spectral information obtained has shown the presence...
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Article
Mass-spectrometric study of some cholinesterase substrates
The fundamental directions of mass spectrometric decomposition of molecular ions of the complex esters of N-(β-hydroxyethyl) anabasine and cytisine are related to the homolytic rupture of the ethylene bridge b...
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Article
IR and UV spectroscopy and the spatial and electronic structure of the dipyridyl N-oxides
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The IR and UV spectra of the dipyridyl N-oxides have been obtained. The frequencies of the stretching and def...
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Article
A demonstration of aldehyde-lactol tautomerism in gossypol by1H and13C NMR spectroscopy
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The existence of a tautomeric equilibrium between the aldehyde and lactol forms gossypol has, for the first t...
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Article
X-ray structural investigation of allomatrine and its N-oxide
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Article
Molecular and crystal structure of sophoridine
The three-dimensional structure of the alkaloid sophoridine C15H24ON2 has been studied by x-ray structural analysis; the parameters of the elementary cell are: a=5.458, b=10.640, c=11.989 Å; γ=99.7°; z=2; space g...
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Article
Anticholinesterase properties of N-[β-(dialkoxyphosphinyl) mercaptoethyl] decahydroquinolines and their methiodides
The anticholinesterase properties of N-[β-(dialkoxyphosphinyl) mercaptoethyl]decahydroquinolines and their methiodides, which are inhibitors with a combined type of activity, have been studied.
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Article
Dmerization of N-methylanabasine in the presence of Raney nickel
N-Methylanabasine undergoes dimerization in the presence of Raney nickel at 170–180°C to give 5,5′-bis(1-methyl-2-piperidyl)-2,2′-dipyridyl. Oxidation of the latter gives 6,6′-bis(nicotinic acid).
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Article
13C NMR spectra and distribution of electron density in some dipyridyl N-oxides
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The contributions made by the Py and PyNO fragments to the13C chemical shifts of the studied dipyridyls were ...
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Article
EPR study of the dehydrogenation rate of hantzsch ester by pyridine N-oxide
Stable signals in the EPR spectra of the reaction mixture were obtained when pyridine N-oxide was used to dehydrogenate Hantzsch ester. The obtained signals belong to the neutral radicals that are formed durin...
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Article
Mechanism of the dehydrogenation of the Hantzsch ether with pyridine N-oxide
A study has been made of the dehydrogenation of Hantzsch ethers by pyridlne N-oxide. A scheme proposed for this reaction shows the hydride-ion passing over into a complex of the Hantzsch ether with the N-oxide...
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Article
Tropolone alkaloids
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Article
Synthesis of some O,O-dialkyl thiophosphates that contain anabasine and decahydroquinoline moieties
A number of N-[β-(dialkoxyphosphinyl)mercaptoethyl]anabasines, N[β-(dialkoxyphosphinyl)mercaptoethyl]decahydroquinollnes, and their methiodides, was synthesized.
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Article
13C NMR spectra study of ring interaction in the dipyridyls andα,α,α-tripyridyl
13C NMR spectroscopy has been used to study ring interaction of dipyridyl isomers. It has been shown that there is a direct proportionality between the change in the paramagnetic contribution to the shielding co...
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Article
The biosynthesis of the alkaloids of Goebelia pachycarpa
1. Qualitative and quantitative compositions of the main alkaloids in five development phases of theGoebelia pachycarpa C. A. Mey. have been determined.
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Article
Alkaloids of Sophora alopecuroides
On the basis of spectral characteristics and chemical transformations, a new alkaloid with the composition C15H22O2N2 isolated fromSophora alopecuroides has been assigned the most probable structure of 13,14-dehy...
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Article
Quantitative determination of the alkaloids ofAnabasis aphylla by thin-layer chromatography
A chromatographic method has been developed for the quantitative determination of the alkaloids ofAnabasis aphylla — anabasine, aphylline, lupinine, aphyllidine, and anabasamine — and also pachycarpine in the mix...
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Article
The structure of anhydrolupinine
It has been shown that the anhydrolupinine obtained from lupinine by the action of water-abstracting agents is a mixture of two isomers differing by the position of a double bond in the ring system of the mole...
