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The polarograms of the metal complexes of Ethylenediaminetetraacetic Acid and of 1,2‐Diaminocyclohexane‐tetraacetic Acid are described. In a mixture, containing the metal complex MYv−4 as well as the uncomplexed cation M+v, it is usually possible to determine the concentration of the latter with high accuracy with the aid of a polarograph. Such measurements have been used for the determination of the ratios of the formation constants of the complexes of two metals M and M′, and from these ratios the individual formation constants of 49 complexes have been obtained. The best values of the formation constants (20°, μ = 0,1) of metal complexes are tabulated.

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Volumen XXXIX, Fasciculus VI (1956) -No. 191-192. SUMMARY. 1589From a theoretical point of view it can be expected that by grinding silicates in the presence of organic reagents a chemical reaction takes place between the newly formed surfaces and the organic molecules. Preliminary experiments on grinding of quartz powder in butanol seem to confirm these theoretical considerations.

Note on a preparation of β, γ‐unsaturated carboxylic acid derivatives using the amide acetal Claisen rearrangement 3‐(Trimethylsilyl)allyl alcohols smoothly undergo the amide acetal Claisen rearrangement furnishing allyl silanes. Subsequent protolysis with HF at −20° provides a convenient, stereoselective method for the preparation of β, γ‐unsaturated carboxylic acid derivatives. Three model examples illustrate the procedure.