Journal of the Chemical Society - Faraday Transactions p. 541 - 548 (1994)
Update date:2022-08-16
Topics:
Doughty, Alan
Mackie, John C.
The kinetics of pyrolysis of pyrimidine diluted in argon have been studied behind reflected shock waves over the temperature range 1200-1850 K, at uniform gas residence times of 850-1000 μs and pressures of 13-15 atm.The major products of pyrimidine pyrolysis were found to be acetylene, HCN, acrylonitrile, cyanoacetylene and H2.Using both end-product analysis and real-time UV spectrometry the kinetics of pyrimidine disappearance were found to be first order with respect to reactant concentration over the concentration range of 0.07-0.3 molpercent.The two techniques yielded a first-order rate constant (kdis) for the disappearance of pyrimidine given by the expression 1012.3(+/-0.4)exp<-275(+/-13) kJ mol-1/RT>s-1.A detailed reaction model incorporating a free-radical mechanism for the decomposition of pyrimidine has been developed, and shown to predict the reactant and product concentrations between 1250 and 1600 K.Important radicals in the mechanism were found to be o- and p-pyrimidyl, with H atoms and CN radicals being radical chain carriers.Sensitivity and flux analysis of the kinetic model has shown the most important initiation pathway to be the loss of an H atom from pyrimidine to yield o-pyrimidyl.Optimisation of the Arrhenius parameters for this initiation reaction yields an activation energy cosistent with a heat of formation of the o-pyrimidyl radical of 376(+/-10) kJ mol-1.
View MoreContact:(86) 731 88718666
Address:Room 1222, Unit 4, Building B, Shangcheng, No.47, Kaiyuan East Road.
Qingdao Kylin Trading Co., Ltd.
Contact:0086-532-68979884/58972912/68972263/65/88171519
Address:Room 2308,A building International Trade Center No.230 Changjiang Middle Road of Qingdao Economic Development Zone,Shandong,China.
Xi'an Kaixiang Photoelectric Technology Co., Ltd
website:http://www.kxmaterials.com/
Contact:86-29-15991651477
Address:Building 6, Biopharmaceutical Industry R&D Cluster Base, No. 16, Caotang 4th Road, Caotang Science and Technology Industrial Base, High-tech Zone, Xi'an City, Shaanxi Province, China
Suqian Ruixing Chemical Co., Ltd.
Contact:+86-527-80805666（总机）;84836008(销售)
Address:3 Jingsilu, Zone north, Hubin Xincheng Development Park, Suqian, China
Hunan Dinuo Pharmaceutical Co.,Ltd.
Contact:86-731-88280100*8561
Address:Bio-pharmaceutical industrial park, Liuyang, Hunan, China
Doi:10.1016/j.tetlet.2010.11.031
(2011)Doi:10.1016/S0040-4039(02)00220-4
(2002)Doi:10.1021/ol302963e
(2012)Doi:10.1021/acs.oprd.5b00382
(2016)Doi:10.1016/j.cattod.2020.04.016
(2021)Doi:10.1016/S0040-4020(01)98412-1
(1964)
