27 research outputs found
ChemInform Abstract: Synthesis and Enantiomeric Excess Measurements of Optically Active N-Acetyl Tetramic Acids.
No full textChemInform Abstract: Synthesis and NMR Spectroscopic Studies of Optically Active Derivatives of γ-Aminobutenoic Acids and 2-Amino-pyrrolin-4-ones.
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Synthesis and NMR spectroscopic studies of optically active derivatives of gamma-aminobutenoic acids and 2-amino-pyrrolin-4-ones
No full textRh(II)-binaphthol phosphate catalysts in the enantioselective intramolecular oxonium ylide formation-[3,2] sigmatropic rearrangement of alpha-diazo-beta-ketoesters
No full textThe enantioselective intramolecular oxonium ylide formation-[3,2] sigmatropic rearrangement of α-diazo-β-ketoesters 9 using catalytic (1 mol%) dirhodium tetrakisbinaphthol phosphate catalysts 1 and 2 to give benzofuranones 11 in up to 62% e.e. is described. © 2001 Elsevier Science Ltd
Synthesis and NMR spectroscopic studies of optically active derivatives of γ-aminobutenoic acids and 2-amino-pyrrolin-4-ones
No full textSynthesis and enantiomeric excess measurements of optically active N- acetyl tetramic acids
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Complexation and spectroscopic studies of 5-benzylidene-3-hexanoyl tetramic acid (BHTA) with magnesium (II), zinc (II) and barium (II) ions.
No full textSynthesis and NMR spectroscopic studies of novel N-Acetyl-3-hydrazonoalkyl tetramic acids
No full text3-(Hydrazonoethyl) and 3-(hydrazonobutyl) tetramic acids 6 - 11 are prepared by condensation reaction of N,3-diacetyl and N-acetyl-3-butanoyl tetramic acids, 4 and 5, with a variety of 1,2-(bis)-nucleophiles. The structure elucidation and the tautomeric equilibrium of the novel compounds 6-11 have been studied using 1H and 13C NMR spectroscopy
