Intermediates in the ene reactions of singlet oxygen and N-phenyl-1,2,4-triazoline-3,5-dione with olefins
作者:M. Orfanopoulos、I. Smonou、Christopher S. Foote
DOI:10.1021/ja00165a053
日期:1990.4
The reaction between singlet oxygen and cis- and trans-2-butene-1,1,1-d 3 has been studied. The product isotope effects (k H /k D ) were found to be 1.38 and 1.25, respectively. Similarly, N-phenyl-1,2,4-triazoline-3,5-dione (PTAD) reacts readily with these substrates and shows isotope effects that are larger (5.36, 1.29) but in the same direction. 2-Methyl-1-propene-3,3,3-d 3 is unreactive with singlet
Stereochemical dependence of isotope effects in the ene reaction of N-phenyl-1,2,4-triazoline-3,5-dione with isomers of butene-d3
作者:Michael Orfanopoulos、Christopher S. Foote、Ioulia Smonou
DOI:10.1016/s0040-4039(00)95637-5
日期:1987.1
The magnitude of the primary isotope effect of the title reaction depends on the relative stereochemistry of the competing groups, being large when the groups are cis and small when they are on opposite sides of the double bond. An intermediate such as a diaziridinium imide is required to rationalize the results.