Journal ArticleDOI
Rapid chromatographic technique for preparative separations with moderate resolution
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Abstract:
(11) Potassium ferricyanide has previously been used to convert w'c-1,2-dicarboxylate groups to double bonds. See, for example, L. F. Fieser and M. J. Haddadln, J. Am. Chem. Soc., 86, 2392 (1964). The oxidative dldecarboxylation of 1,2-dlcarboxyllc acids is, of course, a well-known process. See Inter alia (a) C. A. Grob, M. Ohta, and A. Weiss, Helv. Chim. Acta, 41, 1911 (1958); and (b) E. N. Cain, R. Vukov, and S. Masamune, J. Chem. Soc. D, 98 (1969).read more
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Journal ArticleDOI
Synthesis of terphenyl oligomers as molecular electronic device candidates
Francisco Maya,James M. Tour +1 more
TL;DR: In this article, six functionalized bis(phenylene ethynylene)-p,p-terphenyls (BPETs) have been synthesized as potential molecular electronic devices.
Journal ArticleDOI
Total syntheses of the coumarin-containing natural products pimpinellin and fraxetin using Au(I)-catalyzed intramolecular hydroarylation (IMHA) chemistry.
Aymeric Cervi,Paul Aillard,Nourallah Hazeri,Laurent Petit,Christina L. L. Chai,Anthony C. Willis,Martin G. Banwell +6 more
TL;DR: The title natural products (1 and 2, respectively) have been synthesized by Au(I)-catalyzed intramolecular hydroarylation (IMHA) of the relevant aryl propiolate esters by reaction of the corresponding phenols with either 3-(trimethylsilyl)propiolic acid or propiolic Acid and N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride or dicycl
Journal ArticleDOI
Why (1S)-Camphanates Are Excellent Resolving Agents for Helicen-1-ols and Why They Can Be Used to Analyze Absolute Configurations.
Tienthong Thongpanchang,Kamil Paruch,Thomas J. Katz,Arnold L. Rheingold,Kin-Chung Lam,Louise M. Liable-Sands +5 more
TL;DR: The essential discovery is that, presumably to avoid a steric interaction between a methyl on the camphanate's bridge and the helicene skeleton, the O=CCO conformation is anti- periplanar in (M)-helicenol camphanates and syn-periplanars in (P)- helicenols.
Journal ArticleDOI
Methoden zur Darstellung von 4-Azido-2(1H)-chinolonen
TL;DR: In this article, the 4-hydroxy-2-quinolones were found to be converted to 4-azidocompounds via 4-chloroquinolone derivatives.
Journal ArticleDOI
Structural basis for IL-1α recognition by a modified DNA aptamer that specifically inhibits IL-1α signaling
Xiaoming Ren,Xiaoming Ren,Amy D. Gelinas,Ira von Carlowitz,Nebojsa Janjic,Anna Marie Pyle,Anna Marie Pyle +6 more
TL;DR: By solving the crystal structure of the IL-1α/aptamer, the authors provide a high-resolution structure of this critical cytokine and reveal its functional interaction interface with high-affinity ligands, thereby suggesting a novel route to immunomodulatory therapeutics.