منابع مشابه
Boronic acid catalyzed ene carbocyclization of acetylenic dicarbonyl compounds.
The discovery and development of an efficient ene carbocyclization of 1,3-dicarbonyl compounds bearing pendent terminal alkyne substituents under 3-nitrobenzeneboronic acid catalysis is described. The reaction is efficient, easy to perform and general to a wide range of ketoester substrates.
متن کاملNew acetylenic norlignan compounds from rhizomes of Curculigo crassifolia.
Two pairs of diastereoisomeric acetylenic norlignan compounds with PhCH(OR(1))CH(OR(2))CH(2)C triple bond CPh skeleta: (1R, 2R)-1-O-methylnyasicoside (1) and (1S, 2R)-1-O-methylnyasicoside (2), and (1R, 2R)-crassifogenin D (3) and (1S, 2R)- crassifogenin D (4), were isolated from the ethanolic extract of rhizomes of Curculigo crassifolia. Compounds 3 and 4 are new and their structures were eluc...
متن کاملStudies on uric acid and related compounds. III. Observations on the specificity of mammalian xanthine oxidases.
Xanthine oxidase (X0) has been thoroughly studied by many investigators and the range of possible substrates of this enzyme is well known (1, 2). In the early experiments, enzymatic activity was measured by decolorization of a suitable dyestuff such as methylene blue or by oxygen consumption. Therefore, the exact pathway of oxidation remained unknown for many substrates. The spectrophotometric ...
متن کاملThe chemistry of superheavy elements . III . Theoretical studies on element 113 compounds
The chemistry of element 113 is investigated by theoretical methods. The results of fully relativistic calculations for ~113!H and ~113!F are compared with those derived by other techniques to obtain an indication of the accuracy of the more approximate models as well as the importance of including scalar and/or spin–orbit relativistic effects. Both of these effects are found to be important. T...
متن کاملStudies on Uric Acid and Related Compounds
The systematic study of the substrate specificity of mammalian xanthine oxidase has indicated a common mechanism by which various purines may be dehydrogenated (1). The results obtained also made it clear why methylated xanthines, with the exception of 1-methylxanthine (2), cannot be oxidized by xanthine oxidase to the corresponding substituted uric acids (3, 4). Therefore, another source had t...
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ژورنال
عنوان ژورنال: YAKUGAKU ZASSHI
سال: 1958
ISSN: 0031-6903,1347-5231
DOI: 10.1248/yakushi1947.78.12_1404