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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
Structural variations on N‐acetylneuraminic acid, 16. A convenient approach to 3‐deoxy‐D‐glycero‐D‐galacto‐nonulosonic acid (KDN), 5‐azido‐5‐deoxy‐KDN and 5‐deoxy‐KDN, and their 4‐methylumbelliferyl 2α‐glycosides
Erwin Schreiner,Erich Zbiral +1 more
TL;DR: The reaction of peracetylated N-acetylneuraminic acid methyl ester 1 with nitrosyl acetate affords a mixture of anti/syn-N-nitroso derivatives 2a and 2a′, which can be transformed with sodium trifluoroethanolate into the 5-diazo compound 3 as discussed by the authors.
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Synthesis and reactions of some heterocyclic azacyanines.
TL;DR: The one-step reaction of some amino-substituted heterocycles with diiodomethane to give azacyanines is reported and includes the synthesis of new substituted pyrido-, isoquino-, benzimadazo-, and benzothiazoazacyanine 7.
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Photocontraction of liquid spiropyran-merocyanine films.
TL;DR: Amorphous films of a photochromic spiropyran containing a mesogenic group melt, when exposed to heat together with irradiation, to yield a red fluid that contains aggregates of merocyanine molecules and exhibits marked contraction under light illumination.
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5α-Reduction of norethisterone enhances its binding affinity for androgen receptors but diminishes its androgenic potency
TL;DR: The overall results demonstrated a distinctive, paradoxical effect of 5alpha-reduction upon the NET molecule, which was different from that seen in naturally occurring androgens, and which suggests that the presence of the 17alpha-ethynyl group plays a key role in this phenomenon.
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Synthesis of yuehchukene and some analogues a general approach
TL;DR: Yuehchukene and a number of structural analogues have been synthesized by intromolecular ring closure of α,β-unsaturated 2-acylindoles in the key step.