Hydrogen bond self-association and chemical reactivity. III Urethane reaction and hydrogen bond life time
Caraculacu, AA; Coseri, S
| HERO ID | 4936670 |
|---|---|
| In Press | No |
| Year | 2000 |
| Title | Hydrogen bond self-association and chemical reactivity. III Urethane reaction and hydrogen bond life time |
| Authors | Caraculacu, AA; Coseri, S |
| Journal | Revue Roumaine de Chimie |
| Volume | 45 |
| Issue | 2 |
| Page Numbers | 139-147 |
| Abstract | Phenylisocyanate (PhNCO) reaction with ethanol (EtOH) at high alcohol self-association degree was studied. By using High Performance Liquid Chromatography method (HPLC), differential kinetic behavior of 1,4-butane-diol (BD) and EtOH in some of their mixture during reaction with PhNCO was searched. Synergetic influence between the reaction reactive species was evidenced. The most reactive hydroxilic compound in the studied mixtures are ED. This evidence, beside the kinetical behavior of EtOH in a large scale of self-association, suggested that alcohol linear dimeric forms, as well as the ends of linear associate play a decisive role in urethane reaction. Within urethanes formation reaction, both alcohol and isocyanate molecules participate in activated forms. The activation is realized in both cases by assistance of other alcohol or urethane molecule. The similitude between alcohol and urethane activation effect allows the use of kinetical equations of second order to describe with a good precision the evolution of reaction in all the studied cases. Good concordance between different urethane reaction rate constants and the hydrogen bond life time of the corresponding hydroxylic compound determined by ultrafast pulsed spectroscopy was found. |
| Wosid | WOS:000167410900006 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |