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Native and hydrolyzed fibroin of natural silk modified by benzimidazolyl-2-methylcarbamate hydrochloride was studied using IR spectroscopy, electron-microscopy, X-ray structure analysis, solubility, and dialysis. Mechanical treatment of a mixture of native and hydrolyzed fibroin of natural silk...
New functionally substituted N- and P-containing salts of resinous and bile acids 1b, c, 2b-f, 3b-f, 4b-f, 5b, c , and 6b, c were prepared by reaction of the corresponding acids with amines or triphenylphosphine in anhydrous acetone.
Seed characteristics and the lipid and fatty-acid compositions were determined for the new cotton varieties ASh-25, Omad, 9771-I, Termez-43, and Bukhara-6.
Naturally acetylated glucomannan with MW 31,000 and (α) D 20 -29.1° was isolated from bulbs of Narcissus tazetta L. Chemical methods and IR and 13 C NMR spectroscopies were used to show that the polysaccharide contains 12.9% O-Ac groups and consists of D-mannose and D-glucose in a 1:5.6 ratio...
Homologs of the natural isoflavonoid pseudobaptigenin containing benzodioxane and benzodioxepane fragments were synthesized. Methanesulfonyl, carbamoyl, aminomethyl, and coumarin-containing isoflavone derivatives were prepared.
The lipid composition of ripe and green fruit of Hibiscus esculenthus cultivated in Uzbekistan was studied. The fatty-acid composition of pod and seed lipids was determined. Carbohydrate components including water-soluble polysaccharides, pectinic substances, and hemicellulose were characterized.
Substituted 2-(7-oxofuro(3,2-g)chromen-6-yl) acetic acids, modified psoralen analogs, were synthesized by linear fusion of a furan ring to the coumarin system.
Narrow fractions of polyprenols isolated from birch (C 35 -C 45 ) and fir (C 70 -C 85 ) greenery were used to prepare esters of polyprenylacetic acids that exhibited high anti-ulcer activity comparable and in several instances exceeding that of the known anti-ulcer preparation omeprazole (omez).
Esters 1b-15b were prepared from cetyl alcohol 1a , terpenols 2a-6a , sterols 7a-10a , plant phenols 11a-13a , and alcohols 14a-15a by reaction with 1-adamantanecarboxylic acid chloride in the presence of pyridine.
Crystalline taraxasterol and its acetate were isolated for the first time from Onopordum acanthium . Two-dimensional COSY, HSQC, and HMBC NMR experimentswere carried out forcomplete assignment of signals in the PMR and 13 C NMR. Chemical shifts of stereochemically important methyl C atoms C-28...
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