Some Thermodynamic and Flow Properties of Cis-and Trans-1, 4-Aminocyclohex-Anecarboxylic Acids

摘要

The cis- and trans- isomers of 1,4-aminocyclohexanecarboxylic acid have been prepared by the catalytic hydrogenation of p-aminobenzoic acid. Solubilities in water have been obtained for the cis- isomer at 20, 25 and 30°C and for the trans- isomer at 20°C in connection with the determination of purity. Crystal structures of the hydrated crystals have been obtained by single-crystal X-ray measurements and the densi¬ties of the solid hydrates have been measured at 25°C. The apparent molal volumes in aqueous solution at 25°C have been calculated from smoothed-density data obtained in connection with the determination of the viscosities.nMeasurements of the densities and efflux times for the aqueous solutions of the two acids have been made at 20, 25 and 30°C over a limited range of concentration.