In this report, relation between increase of volume of carbon tetrachloride solution saturated with ethylene and pressure was determined at 20°C and 30°C in a view of industrial application. Telomerization was carried out at comparatively high "volume ratio". Effect of increase of carbon tetrachloride volume on the relative concentration of ethylene, reaction pressure, composition of α, α, α, ω-tetrachloroalkane, was studied. Azo-bis-iso-butyronitrile was used as initiator and benzoyl peroxide and di-tert-butylperoxide were also used for comparison8).