Science Record

10

quantity ratio of sebacic acid and iso-octyl alcohol at 140, 150, 160 and 170°C in the absence of foreign acid, are plotted in Figs. 1 and 2 and shown in

30}

25

On 5 10 15 20 t (hr.)

Fig. 1 Reactions of equivalent quantity ratio of sebacie acid with normal-octyl alcohol at different temperatures.

Table 1 and 2 according to equation (1). All the results are in conformity with a 2Y% order reaction. The relationships between temperatures and

specific velocity constants in the reactions of sebacic acid with normal-octyl alcohol and that with iso-octyl alcohol are shown in Fig. 3, from which the activation energy is found to be 14 Keal. for the former reaction, and 16 Keal. for the latter. Tables 1 and 2 further show that the velocity constant for the reaction of sebacic acid and normal-octyl alcohol is about five times greater than that for the reaction of sebacic acid and iso-octyl alcohol at the same temperature. This phenomenon may be explained by the theory of molecular structure. Since the normal-octyl alcohol CH3;-CH,-CH,-CH,CH,- CH, -CH,-CH,OH is different from the iso-octyl alcohol CH;-CH,-CH,CH,-CH,-CH,-CHOH-CH, by one hydrogen atom on the carbon atom of the latter molecule being substituted by the methyl group, and since the methyl group can form hyperconjugation with the lone pair of electrons of the oxygen