Asymmetric 1,3-Dipolar Cycloaddition Reactions

Publisher Summary This chapter provides an overview of the 13 Carbon-nuclear magnetic resonance ( 13 C-NMR) spectroscopy of monosaccharides. The 13 C-NMR spectroscopy has become increasingly important as a tool for the characterization and structural elucidation of sugars and their derivatives. Although 13 C-NMR is closely related to 1 H-NMR spectroscopy, especially when both types of spectra are recorded with Fourier-transform instruments, the two techniques are sufficiently different to be valuable complements to each other. In many cases, in particular when dealing with complex molecules such as polysaccharides, the amount of information obtainable from 1 H-NMR spectra is limited as compared to that revealed by 13 C- NMR spectra. This chapter provides an almost complete collection of 13 C- NMR chemical shifts of monosaccharides, their methyl glycosides, and acetates, along with the examples of shift data for as many different types of monosaccharide derivative as possible. It also provides details on sampling techniques and assignment techniques, and discusses the identity of monosaccharides, their structure determination, and conformational analysis .

Carbon-13 Nuclear Magnetic Resonance Spectroscopy of Monosaccharides

This account examines double asymmetric induction from theoretical and practical viewpoints. In the context of four major organic reactions-the aldol, Diels-Alder, catalytic hydrogenation, and epoxidation-it is shown that a double asymmetric induction can be analyzed in terms of the single asymmetric reactions of each of the two chiral reactants. A rule which qualitatively relates the results of these single asymmetric reactions with the outcome of the double asymmetric reaction is proposed. A powerful new strategy based on this rule for the predictable creation of new chiral centers is discussed and the use of this strategy for the synthesis of sugars and macrolides is presented.

Double Asymmetric Synthesis and a New Strategy for Stereochemical Control in Organic Synthesis

(1990). The Shikimate Pathway — A Metabolic Tree with Many Branche. Critical Reviews in Biochemistry and Molecular Biology: Vol. 25, No. 5, pp. 307-384.

The shikimate pathway―a metabolic tree with many branches

Biochemistry and Molecular Biology The Shikimate Pathway - A Metabolic Tree with Many Branches

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Reactions of tert-butyl nitrones and trimethylsilyl nitronates. synthesis and reactions of isoxazolidines and 2-isoxazolines

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The reactions of lignin with alkaline hydrogen peroxide. part iii. the oxidation of conjugated carbonyl structures

Unter Verwendung einer Mikroelektrode, hergestellt aus feinem Pt-Draht in einer Glasrohre, ist es moglich, di?nierte Redoxpotentiale von aromatischen Kohlenwasserstoffen wie z.B. Perylen und 1,2-Bis-[anthranyl-(9)]-athan in den Titellosungsmitteln zu messen.

Voltammetry in Benzene and Chlorobenzene. The Behaviour of Ions of Aromatic Compounds in Nonpolar Media.

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Formation of aromatic compounds from carbohydrates. vi. reaction of dihydroxyacetone in slightly acidic, aqueous solution

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Jan-Erik Berg

Papers

Reactions of tert-butyl nitrones and trimethylsilyl nitronates. synthesis and reactions of isoxazolidines and 2-isoxazolines

The reactions of lignin with alkaline hydrogen peroxide. part iii. the oxidation of conjugated carbonyl structures

Voltammetry in Benzene and Chlorobenzene. The Behaviour of Ions of Aromatic Compounds in Nonpolar Media.

Formation of aromatic compounds from carbohydrates. vi. reaction of dihydroxyacetone in slightly acidic, aqueous solution

Chemical Synthesis and Disproportionation of N-Hydroxytyrosine.