Journal ArticleDOI
Rapid chromatographic technique for preparative separations with moderate resolution
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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Donor-Acceptor-Donor Thienopyrazines via Pd-Catalyzed C-H Activation as NIR Fluorescent Materials.
Louis E. McNamara,Nalaka P. Liyanage,Adithya Peddapuram,J. Scott Murphy,Jared H. Delcamp,Nathan I. Hammer +5 more
TL;DR: A series of thienopyrazine-based donor–acceptor–donor (D–A–D) near-infrared (NIR) fluorescent compounds were synthesized through a rapid, palladium-catalyzed C–H activation route, and their stable emission at the single-molecule level makes these compounds good candidates for single-Molecule photon sources in the near- Infrared.
Journal ArticleDOI
Phosphate ester cleavage catalyzed by bifunctional zinc complexes: Comments on the “p-nitrophenyl ester syndrome”
Ronald Breslow,Sharat Singh +1 more
TL;DR: A tetra-aza macrocyclic Zn2+ complex has been attached to β-cyclodextrin this article, which is a better catalyst for the hydrolysis of p-nitrophenyl diphenyl phosphate than is the simple complex.
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Thermal Effects in the Organocatalytic Asymmetric α‐Amination of Disubstituted Aldehydes with Azodicarboxylates: A High‐Temperature Organocatalysis
TL;DR: In this paper, a thermally accelerated organocatalytic α-amination of disubstituted aldehydes with azodicarboxylates under microwave conditions is described.
Journal ArticleDOI
Stereochemistry of lysine formation by meso-diaminopimelate decarboxylase from wheat germ: use of 1H-13C NMR shift correlation to detect stereospecific deuterium labeling.
TL;DR: Analysis by two-dimensional 1H-13C heteronuclear NMR shift correlation spectroscopy with 2H decoupling confirmed the stereochemistry of the B. sphaericus enzyme reaction and showed that the eukaryotic wheat germ meso-DAP decarboxylase also operates with inversion of configuration.
Journal ArticleDOI
Synthesis of Peptides Containing α,α‐Disubstituted α‐Amino Acids by the Azirine/Oxazolone Method: The (12–20)‐Nonapeptide of the Ionophore Alamethicin
Peter Wipf,Heinz Heimgartner +1 more
TL;DR: In this paper, the ionophor alamethicin was synthesized by using 3-amino-2,2-dimethyl-2H-azirines 2 as synthons for the α-aminoisobutyric acid (Aib) moieties.