La photochimie de l'isoprène gazeux dans la région de l'ultraviolet très lointain
-
Published:1988-06-01
Issue:6
Volume:66
Page:1513-1519
-
ISSN:0008-4042
-
Container-title:Canadian Journal of Chemistry
-
language:en
-
Short-container-title:Can. J. Chem.
Author:
Deslauriers Hélène,Dufour Sylvain,Collin Guy J.
Abstract
Yields of various products have been measured in the photolysis of isoprene at 184.9, 213.8, and 228.8 nm and at pressures between 1 and 400 Torr. At each wavelength, the major process is the rupture of a C—CH3 bond, which leads to the formation of methyl and CH2=C=CHCH2. The quantum yield for this process is 0.83 ± 0.08 at 213.8 nm. The lifetime of the intermediate involved in this process is 20 ns at 184.9 nm. Similar quantities of ethylene and C3H4[Formula: see text] and propene and acetylene [Formula: see text] are measured. All the measured yields decrease with an increase in the pressure. In addition to these fragmentation processes, isomerization reactions are also observed, particularly at 228.8 nm. They lead to the formation of 1,3- and 1,4-pentadiene as well as 3-methyl-1,2-butadiene. The Stern–Volmer plot for each isomer is different and each plot shows a strong negative curvature, indicating the complexity of the reaction process. The lifetime of each intermediate is 2 ns or less.
Publisher
Canadian Science Publishing
Subject
Organic Chemistry,General Chemistry,Catalysis
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Monoterpenoids;Natural Product Reports;1992