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Kinetics of dimerisation of gaseous keten

The dimerisation of gaseous keten in the temperature and pressure ranges 225 to 323 °C and 6 to 155 mmHg, respectively, is essentially homogeneous and of the second order in carbon-coated reactors, k = 105.25 exp(−74 000/RT) l mol−1 s−1. The entropy of activation, at – 166.4 J K−1 mol−1, agrees closely with values obtained in solution for the dimerisation or cycloaddition reactions of other ketens.