DETERMINATION OF THE REACTION ENTHALPY AND KINETIC-PARAMETERS FOR THEISOMERIZATION OF BRIDGED DEWAR BENZENES TO 8,9-DISUBSTITUTED [6]PARACYCLOPHANES BY DIFFERENTIAL SCANNING CALORIMETRY

Authors
DREESKAMP H SARGE SM TOCHTERMANN W
Citation
H. Dreeskamp et al., DETERMINATION OF THE REACTION ENTHALPY AND KINETIC-PARAMETERS FOR THEISOMERIZATION OF BRIDGED DEWAR BENZENES TO 8,9-DISUBSTITUTED [6]PARACYCLOPHANES BY DIFFERENTIAL SCANNING CALORIMETRY, Tetrahedron, 51(11), 1995, pp. 3137-3140
Citations number
13
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Tetrahedron → ACNP
ISSN journal
00404020
Volume
51
Issue
11
Year of publication
1995
Pages
3137 - 3140
Database
ISI
SICI code
0040-4020(1995)51:11<3137:DOTREA>2.0.ZU;2-0
Abstract
In solution the reaction enthalpy for the thermal isomerization of the Dewar isomers 2a and 2b to their corresponding 8,9-disubstituted [6]p aracyclophanes 1a and 1b was determined as -128+/-13 kJ . mol(-1) and -146+/-15 kJ . mol(-1), while the activation energies were found to be 101+/-10 kJ . mol(-1) and 117+/-12 kJ . mol(-1) respectively. An impr oved calorimetric technique was employed using samples in sealed NMR t ubes.