The kinetics of the oxygen-initiated polymerization of ethylene at high pressure up to 2.220 kbar was systematically investigated in a constant volume system in a temperature range from 60 to 250°C. In the higher temperature range (above 190°C), where no induction period exists, rate equations for both the oxygen consumption and the polymerization were derived by considering a retardation reaction by oxygen. The numerical calculation of these equations by the Runge-Kutta-Gil method indicated an excellent agreement with experimental results.

The activation volume of the base-promoted solvolysis of l-chloro-3-methylbuta-l,2-diene in an ethanol-water mixture 80:20 vol/vol at 250 equals +5 cm3/mol. A combination of this value with that measured earlier for 3-chloro-3-methylbut-l-yne and with the densities of these two substrates shows that the two transition states have virtually identical volumes. This suggests that the two precursor anions are on their way to a common

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Aus den Geschwindigkeitskonstanten der Solvolyse des Chlorbutadiens (I) in einem Äthanol‐Wasser‐Gemisch in Gegenwart von Basen bei verschiedenen Drücken und 25°C wird das Aktivierungsvolumen ermittelt.