Enthalpy of phase transitions of lactams |
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Authors: | V. N. Emel’yanenko S. P. Verevkin R. V. Ralys V. V. Turovtsev V. Yu. Orlov |
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Affiliation: | 1. Rostock University, 18055, Rostock, Germany 2. Tver State University, Tver, 170100, Russia
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Abstract: | The transpiration method is used to measure the temperature dependences of the vapors pressures of azacyclobutan-2-one (I, CAS 930-21-2) azacyclohexan-2-one (II, CAS 675-20-7); azacyclooctan-2-one (III, CAS 673-66-5); azacyclononan-2-one (IV, CAS 935-30-8) and azacyclotridecan-2-one (V, CAS 947-04-6). Enthalpies of sublimation and vaporisation are determined. The temperatures and enthalpies of fusion of compounds (I, III-V) are found by means of differential scanning calorimetry. The dependences of the enthalpies of vaporisation of lactones, lactams, cycloalkanes, cycloalkanones on the size of a cycle are analyzed. |
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