Fullerene C60 and C70 photosensitized oxygenation of olefins
作者:Michael Orfanopoulos、Spiros Kambourakis
DOI:10.1016/s0040-4039(00)73202-3
日期:1994.3
C-60 and C-70 sensitize the photooxygenation of 2-methyl-2-butene as well as (E)-2-methyl-2-pentene-1,1,1-d(3) by the intermediacy of singlet oxygen. Addition of DABCO reduces substantially the rate of photooxygenation. The regio- and stereoselectivity of these reactions are reported
Photochemical Reactions in the Interior of a Zeolite. Part 5: The Origin of the Zeolite Induced Regioselectivity in the Singlet Oxygen Ene Reaction
作者:Edward L Clennan、Jakub P Sram
DOI:10.1016/s0040-4020(00)00514-7
日期:2000.9
Photooxidations of several new alkenes in the interior of methylene blue doped NaY are reported. The results suggest that the novel regiochemistry of these reactions can be rationalized by invoking both cation complexation with the alkenes and electrostatic interaction between the cation and the pendant oxygen on the developing perepoxide. (C) 2000 Elsevier Science Ltd. All rights reserved.
Control of Regioselectivity by the <i>l</i><i>one</i> Substituent through Steric and Electronic Effects in the Nitrosoarene Ene Reaction of Deuterium-Labeled Trisubstituted Alkenes
For the enereaction of 4-nitronitrosobenzene (ArNO) with a variety of primary and secondary lone alkyl-substituted substrates, the twix/twin regioselectivity is constant at about 85:15. In contrast, for the lone tert-butyl group and for lone aryl substituents, the twix regioisomer is obtained exclusively. These regioselectivities have been rationalized in terms of steric interactions and coordination