Kinetics of the gas-phase thermal decompositions of 1-methoxy-1-methylcyclopropane and cis- and trans-1-methoxy-2-methylcyclopropane
作者:Iftikhar A. Awan、Michael C. Flowers
DOI:10.1039/f19858101415
日期:——
In the temperature range 665–737 K the thermaldecomposition of 1-methoxy-1-methylcyclopropane follows first-order kinetics with a rate constant given by the equation, k/s–1= 1014.76±0.81 exp(–252±10 kJ mol–1/RT). The presence of the 1-methyl substituent destabilises the transition state for reaction. Secondary decomposition of the initially formed isomeric products precludes the determination of their
在665–737 K的温度范围内,1-甲氧基-1-甲基环丙烷的热分解遵循一级动力学,其速率常数由方程式k / s –1 = 10 14.76±0.81 exp(–252±10 kJ摩尔–1 / R T)。1-甲基取代基的存在破坏了反应的过渡态。最初形成的异构体产物的二次分解使得无法确定其单独的形成速率。
KIRMSE W.; RODE J.; RODE K., CHEM. BER., 119,(1986) N 12, 3672-3693
Unexpected C−C Bond Cleavage and C−C Bond Formation Observed in the Reaction of a Cationic Iridium Complex with Heteroatom-Substituted Cyclopropanes
作者:Mitchell R. Anstey、Cathleen M. Yung、Juana Du、Robert G. Bergman
DOI:10.1021/ja068312a
日期:2007.1.1
[Cp*(PMe3)Ir(η3-C3H4CH3)][OTf] (8) and the corresponding amine or alcohol. The methyl group initially bound to iridium is no longer extruded as methane, but instead is incorporated into the allyl moiety to give a new carbon−carbon bond. A detailed mechanistic study provides evidence in support of an initial C−C bond activation mechanism as opposed to the initial C−H bond activation observed with other known