Conformational consequence of stereoelectronic effects in seven-membered cyclic acetals: nuclear magnetic resonance investigation of 1,3-benzodioxepin and its 2-substituted derivatives
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چکیده
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Spectral assignment and conformational analysis of cyclic peptides by carbon-13 nuclear magnetic resonance.
Tentative assignment for each carbon resonance in the natural abundance high resolution carbon-13 nuclear magnetic resonance Fourier transform spectrum at 25.2 MHz of the biologically active cyclic octapeptides, synthetic oxytocin (43 carbons) and lysine-vasopressin (46 carbons) and the cyclic dodecapeptide bacitracin (66 carbons) has been made using a number of different techniques. The 1% ass...
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Naphthoquinones are natural aromatic compounds that can be discovered in various plant families. In recent times a diversity of biological activities of these compounds has been reported. In most cases, these pharmacological activities are related to redox and acid-base properties, which can be modulated synthetically by modifying the substituents attached to the 1, 4- naphthoquinone ring, in o...
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چکیده هدف از این کار بررسی الکترواکسیداسیون کتکول و مشتقات آن در حضور 4-فنیل سمی کاربامازید بوده است اکسیداسیون کتکولها ترکیبات نا پایدار کینونها را تولید می کنند که این ترکیبات می تواند در واکنش مایکل بعنوان پذیرنده نوکلئوفیل عمل نمایند. در ادامه اکسایش کتکولهای (a-c1) را درحضور 4-فنیل سمی کاربامازید در محلول آب/استونیتریل (90/10)بوسیله ولتامتری چرخه ای و کولن متری در پتانسیل ثابت مورد بررسی ...
15 صفحه اولSynthesis and Bactericidal Activity of Substituted Cyclic Acetals
Bacteria of the genus Azospirillum are among the most studied bacteria, stimulating the growth of plants and capable of associative interaction with many higher plants. They have a high adaptive potential to the negative external influences, like the lack of nutrients, salinity, lack of moisture. Compared with other rhizosphere microorganisms, Azospirillum have sufficiently high resistance to h...
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ژورنال
عنوان ژورنال: Canadian Journal of Chemistry
سال: 1984
ISSN: 0008-4042,1480-3291
DOI: 10.1139/v84-479