Halogenierte Pyridine IV. Kernchlorierte Pyridin-3-carbonsäuren

Halogenated pyridines IV. Nuclear chlorinated pyridine-3-carboxylic acids . Chlorinated pyridine-3-carboxylic acids (nicotinic acids) are readily accessible by oxidation of nuclear chlorinated 3-chloromethyl-pyridines. The catalytic oxidation procedures proved to be by far the best ones of the methods tested.     

Peroxophosphorsäuren

Reaction between P₄O₁₀ and H₂O₂ yields the hitherto unknown Diperoxo monophosphoric acid, H₃PO₆ (VI). The new compound is also the product of the reaction between P₂O₃Cl₄ or OPCl₂(OH) with H₂O₂. Solvolysis of P₂O₃F₄ with H₂O₂ leads to the formation of Difluoro peroxo monophosphoric acid, HPO₃F₂ (XI), which has not been known as yet. Monofluoro peroxo monophosphoric acid, H₂PO₄F (IV), is formed in the reaction between OPCl₂F with H₂O₂ in good yield. Properties, especially NMR data of the new compounds and other peroxo acids of phosphorus are described.     

Furancarbonsäuren aus Rinderharn

Furancarboxylic Acids in Cattle Urine The urine of cattle contains large amounts of furancarboxylic acids. The same acids were isolated from rats after feeding with methyl esters of the so-called F-acids. Since the F-acids were not detected in cattle-food, they must be produced somewhere in the body of cattle.