At 60ºC (Fig. 3) it can be suggeste

At 60ºC (Fig. 3) it can be suggested that an induction period required for test E2 that is not observed for Rx E1 because the higher molar excess used dilutes the system and it can diminish the reaction rate. Even a higher relation molar (4:1) generates a lower chemical kinetic (test E3) so any induction period is evident. This period could happen due the mass transfer phenomena that occurred at the interphase reaction and later studies are needed for a full understanding.

According to E4-E6 tests (Fig. 3b) hydroxylations with ethanol at 70ºC required appreciable low reaction times (

Results (Vietnamese) 1:

At 60ºC (Fig. 3) it can be suggested that an induction period required for test E2 that is not observed for Rx E1 because the higher molar excess used dilutes the system and it can diminish the reaction rate. Even a higher relation molar (4:1) generates a lower chemical kinetic (test E3) so any induction period is evident. This period could happen due the mass transfer phenomena that occurred at the interphase reaction and later studies are needed for a full understanding.According to E4-E6 tests (Fig. 3b) hydroxylations with ethanol at 70ºC required appreciable low reaction times (<3h), showing the influence of temperature on the kinetic rate. These reactions also present little induction times that get higher increasing the molar relation used (test E5 and E6). The best result (E6) is obtained with the highest ethanol:epoxide molar relation (4:1) in a convenient reaction time (45 minutes).In the case of ethylene glycol (Fig. 4) there is a similar behavior between temperature and molar relations but the minimum COO values are obtained using the lesser molar excess (6:1). Temperature positively influence the reaction time, it decreases from 4 h (at T=60ºC) to short periods (t<1.7h at T=80ºC).The minimum molar relation (6:1) obtained the best result (G4) in a reaction time of 1hour. As expected, these hydroxylations needed more time than those with ethanol, due the steric limitations of ethylene glycol molecule.B. Infrared spectroscopy