## Abstract The pyrolyses of endo‐ and exo‐5‐methylbicyclo (2.2.2) oct‐2‐ene (endo‐ and exo‐MBO) have been studied between 608 and 679°K at pressures between 7 and 37 torr. These reactions correspond to parallel first‐order eliminations of propene and ethylene: equation image The rate constants (
Kinetic Isotope Effects and exo/endo-Face Selectivity in the Unimolecular Dehydrogenation of Norborneol Alkoxides in the Gas Phase
✍ Scribed by Uwe Dreyer; Detlev Sülzle; Detlel Schröder; Helmut Schwarz
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- German
- Weight
- 203 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The study of specifically labeled alkoxides generated in the gas phase by deprotonation of epimeric norbernols demonstrates, beyond any doubt, that ‘solvated’ hydride ions are formed as intermediates in the course of enolate formation. Kinetic isotope effects and exo/endo‐face selectivities for the dehydrogenation are discussed.
📜 SIMILAR VOLUMES
The thermal reactions of endoand ao-5-cyanobicyclo-[2.2.2loct-2-ene and their transand cis-6-methyl-substituted derivatives have been investigated in the gas phase between 518 and 630 K. Each product decomposes by two parallel first-order retro-Diels-Alder reactions, a main one with formation of cyc
## Abstract First‐order rate constants for formation of cyclohexanone and 2‐cyclohexen‐1‐ol from 1,2‐epoxycyclohexane and 1,2‐epoxycyclohexane‐3,3,6,6‐__d__~4~ have been determined over the temperature range of 677–746°K. The observed kinetic isotope effects are used in an attempt to determine the
The reactions k N n m endo-5-Ybicyclo[2.2.2loct-2-ene (NYBO) eno-5-Ybicyclo[2.2.2loct-2-ene (XYBO) O + < , < (YE) KXYBO (CHD) where Y = CH, (MI, C,H, (E), i-C,H, (I), and t-C,H, (TI have been studied between 488 and 606 K. The pressures of CHD ranged from 16 to 124 torr and those of YE from 57 to 62
## Abstract The kinetics of the thermal reactions of bicyclo[4.2.2]deca‐3,7‐diene (BDD) and endo‐ and exo‐5‐vinylbicyclo[2.2.2]oct‐2‐ene (endo‐ and exo‐VBO) have been studied in the gas phase. The temperature range was 459–526 K for BDD, 476–563 K for endo‐VBO, and 513–578 K for exo‐VBO. The initia
The intramolecular elimination of isobutene from 2-d,-triisobutylaluminum has been studied in the gas phase for temperatures ranging between 102.4 and 184.6'C. The reaction is apparently homogeneous and obeys the first order rate law, yielding the following Arrhenius relationship: log kelim (sec-')