Study on the Thermal Decomposition Mechanism of Azetidine Using Low Pressure Pyrolysis Method

Tohru Kamo, Muneyoshi Yamada, Jie Tang, Yozo Ohshima, Akira Amano, Yozo Ohshima

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7 Citations (Scopus)


The thermal decomposition of aietidine was studied below HOOK and under the pressure of 10-3 Pa using a low pressure pyrolysis method (Table 1). Ethylene and methanimine were found to be main products (Fig. 1). The stoichiometry of (CH2)8NH →C2H4 + CH2NH was established on the basis of mass balance of ethylene (Table 2). First order rate constants at various temperature were determined from conversion (Table 3). The three cases of biradical mechanism, k2 ≫k-1 k2=k-1, k2≪k-1 were examined according to general procedure of RRKM calculation. In the first two cases, A factor was obtained by analogy with the decomposition of the oxetane (Table 4). In the third case, A factor was estimated from the entropy deference between the biradical and azetidine (Table 5) and activation entropy for the decomposition of the biradical (Table 6). High pressure Arrhenius parameters were given as follows (Fig. 2), (Tables 7, 8). k=1015.4±o.4exp(-233±6/RT) It can be concluded that azetidine decomposes via biradical mechanism, and the heat of formation of the aminomethyl radicals, Hf298(H2NCH2·) = 122±15kJ·mol-1, is derived from the kinetic data.

Original languageEnglish
Pages (from-to)1560-1566
Number of pages7
Issue number8
Publication statusPublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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