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The determination of stereochemistry of 3-methylenecepham derivatives by means of lanthanide-induced shifts

✍ Scribed by Michihiko Ochiai; Eiji Mizuta; Osami Aki; Akira Morimoto; Taiiti Okada

Publisher
Elsevier Science
Year
1972
Tongue
French
Weight
195 KB
Volume
13
Category
Article
ISSN
0040-4039

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✦ Synopsis

We have recently reported facile syntheses of 3-methylenecepham derivatives (2) by an electrochemical reduction 1) and by chromium(I1) salts reduction2) of the corresponding cephalosporanic acids (A).

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Reactions and determination of stereoche
Reactions and determination of stereochemistry of 3-methylenecepham derivatives
✍ Michihiko Ochiai; Osami Aki; Akira Morimoto; Taiiti Okada πŸ“‚ Article πŸ“… 1972 πŸ› Elsevier Science 🌐 French βš– 198 KB

In the previous communications, 1,2) we reported the facile syntheses of a novel class of cephalosporlns, 3-methylenecepham derivatives, by an electrochemical reduction or chromium(I1) salts reduction of cephalosporanic acids. This communication describes some aspects of chemical reactions of these

Lanthanide induced paramagnetic shiftsβ€”d
Lanthanide induced paramagnetic shiftsβ€”derivation of equilibrium constants and absolute shifts in Eu(DPM)3 systems
✍ R. K. Mackie; T. M. Shepherd πŸ“‚ Article πŸ“… 1972 πŸ› John Wiley and Sons 🌐 English βš– 365 KB

## Abstract Relationships between the magnitude of induced ^1^H NMR shifts and the equilibrium conditions in solutions containing lanthanide shift reagents are discussed and applied to the shifts induced in several organic molecules by Eu(DPM)~3~. Evidence that monoadduct formation is the predomina