caa a22 4500 469038535 CHVBK 20180323132802.0 cr unu---uuuuu 170328e19921001xx s 000 0 ger 10.1007/BF00811541 doi (NATIONALLICENCE)springer-10.1007/BF00811541 Thiele Lothar Zentralinstitut für Organische Chemie, Bereich Makromolekulare Verbindungen, D-O-1199, Berlin, Bundesrepublik Deutschland aut Kinetik der unkatalysierten Urethanbildung [Elektronische Daten] [Lothar Thiele] Kinetics of the spontaneous urethane formation Summary: The kinetics of the reaction of phenylisocyanate with 1-butanol have been studied at low concentrations in carbon tetrachloride solution at three temperatures. The present paper describes the relation between the reaction rate and the concentration of the alcohol dimer and the 1:1 alcoholurethane associate. Therefrom we conclude that the monomeric alcohol does not play any significant part in the reaction. We explain the observed rate equation with the second-order term of the reactants with the equality of the productsk AA K AA andk AU K AU (rate constant and association constant of alcohol dimer and 1:1 alcohol-urethane associate). For the reaction of alcohol dimer ΔH ≠=45.4 kJ mol−1 and ΔS ≠=− 142J mol−1K−1. We interpret this result in terms of a six-cyclic transition state. Springer-Verlag, 1992 Activation parameters nationallicence Association of alcohol and urethane nationallicence Spontaneous reaction nationallicence Urethane formation nationallicence Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/10(1992-10-01), 865-874 0026-9247 123:10<865 1992 123 706 https://doi.org/10.1007/BF00811541 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00811541 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Thiele Lothar Zentralinstitut für Organische Chemie, Bereich Makromolekulare Verbindungen, D-O-1199, Berlin, Bundesrepublik Deutschland aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/10(1992-10-01), 865-874 0026-9247 123:10<865 1992 123 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer