ISSN:
0009-2940
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Energy Profile of the o-Quinodimethane ⇄ Benzocyclobutene Equilibrium, IIThe kinetics of the decomposition of keton 3 yielding o-quinodimethane (2) (Ea = 25.6 kcal/mol; A = 3.1 × 1013s-1) and its cyclisation to benzocyclobutene (1) (Ea = 26.9 kcal/mol; A = 2.1 × 1012 S-1) is measured by shock tube technic. From the temperature dependence of the equilibrium 1 ⇄ 2 which is studied by the same method, the enthalpy of formation of o-quinodimethane 2 is established to be ΔHfo (g) = 60.8 kcal/mol.
Notes:
Mit Hilfe der Stoßrohr-Technik werden ausgehend vom Keton 3 Aktivierungsparameter für die Bildung des o-Chinodimethans (2) (Ea = 25.6kcal/mol; A = 3.1 × 10 13 S-1) und dessen Weiterreaktion zum Benzocyclobuten (1) (Ea = 26.9 kcal/mol; A = 2.1 × 1012 S-1) bestimmt. Mit der gleichen Technik wird aus der Temperaturabhängigkeit des Gleichgewichtes 1 ⇄ 2 die Bildungsenthalpie des o-Chinodimethans (2) zu ΔHfo (g) = 60.8 kcal/mol abgeleitet.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19811141202
