Efficient Production of Enol Ether Radical Cations by Heterolytic Cleavage of β-Mesylate Radicals
作者:Elsa Taxil、Laurent Bagnol、John H. Horner、Martin Newcomb
DOI:10.1021/ol034061o
日期:2003.3.1
[reaction: see text] alpha-Methoxy-beta-mesyloxy radicals were produced in laser flash photolysis reactions, and yields of enoletherradicalcations formed by heterolytic fragmentation of the mesylate group were determined. The mesylate heterolysis reaction is faster than heterolyses of phosphate and bromide groups in analogous radicals and highly efficient in medium-polarity solvents.
Product Studies and Laser Flash Photolysis on Alkyl Radicals Containing Two Different β-Leaving Groups Are Consonant with the Formation of an Olefin Cation Radical
作者:Brian C. Bales、John H. Horner、Xianhai Huang、Martin Newcomb、David Crich、Marc M. Greenberg
DOI:10.1021/ja0042938
日期:2001.4.1
hydrogen atom transfer to the oxygen of the olefin cation radical, followed by deprotonation. Laser flashphotolysis experiments indicate that reaction between 5 and 1,4-cyclohexadiene occurs with a rate constant of approximately 6 x 10(5) M(-1) s(-1). 2,2-Dimethoxy-1-phenylpropane (18) is observed as a minor product. Laser flashphotolysis experiments place an upper limit on methanol trapping of 5