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

被引：8
|
作者：
DREESKAMP, H
SARGE, SM
TOCHTERMANN, W
机构：
[1] PHYS TECH BUNDESANSTALT,D-38116 BRAUNSCHWEIG,GERMANY
[2] CHRISTIAN ALBRECHTS UNIV KIEL,INST ORGAN CHEM,D-24098 KIEL,GERMANY
来源：
TETRAHEDRON | 1995年 / 51卷 / 11期
关键词：
6]PARACYCLOPHANES; DEWAR ISOMERS; REACTION ENTHALPY; ACTIVATION ENERGY; CALORIMETRY;
D O I：
10.1016/0040-4020(95)00072-G
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
In solution the reaction enthalpy for the thermal isomerization of the Dewar isomers 2a and 2b to their corresponding 8,9-disubstituted [6]paracyclophanes 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 improved calorimetric technique was employed using samples in sealed NMR tubes.
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页码：3137 / 3140
页数：4
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