THE vapor pressures of pure perfluoro-n-butane, perfluoromethylcyclohexane, perfluorodimethylcyclohexane, and perfluoro-n-heptane were determined.Heats and entropies of vaporization were calculated.Critical constants of perfluoro-n-butane, perfluoro-n-heptane, and perfluoromethylcyclohexane were evaluated, and boiling points, densities, refractive indices, surface tensions, and viscosities are given for a number of pure fluorocarbons. The behavior of some fluorocarbons towards hydrolysis was also studied.AFTER the preparation of a number of pure fluorocarbons by the method of synthesis described in previous papers of the current series (1), a demand for the determination of some of their

A PRACTICAL and general synthesis for completely fluorina ted organic compounds was developed; it consists of reaction between cobalt trifluoride and vaporized hydrocarbons or fluorohydrocarbons at elevated temperatures. A number of pure fluorocarbons, ranging from perfluoron-butane to perfluorocetane, were produced and characterized.Certain reaction by-products were identified. Perfluoro-n-heptane was obtained in yields up to 78% from n-heptane, and perfluorodimethylcyclohexane in 88% yields from bis(trifluoromethyl)benzene. Crude yields for these two feed stocks were 91 and 97%, respectively.

Present commercial rigid foams are based on polyester raw materials. It has now been demonstrated that certain hydroxyl-terminated polyethers can be used satisfactorily as a major component of rigid urethane foams. These polyethers are hexafunctional materials prepared by reacting propylene oxide with sorbitol.

Ein neues Niederdruckverfahren zur Darstellung von Butyraldehyd in Gegenwart eines Rhodiumkatalysators der zurück= ‐ gewonnen werden kann, wird beschrieben.

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