ethene in neat (no solvent) decompn. on storing at 20°C in presence of ethene (several h, Ar);; condensation into a cooled trap (-78°C, E-4 Torr); contaminated;;

in neat (no solvent) decompn. on storing at 20°C (several h, Ar);; condensation into a cooled trap (-78°C, E-4 Torr); contaminated,purity: 85percent;;