Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Photo Bergman cycloaromatization enediynes

Jones, G. B., Russell, K. C. The photo-Bergman cycloaromatization of enediynes. CRC Handbook of Organic Photochemistry and... [Pg.550]

It was found that cyclization of benzannulated enediynes can be initiated by irradiation to give the same products as were obtained by thermal Bergman cyclization [238]. Photo-Bergman cyclization, which is also related to the chemistry of benzyne, has not been so extensively investigated. Terminal acyclic enediynes capable of cycloaromatization by thermal C -C route do not undergo photochemical initiation. However, introduction of one or two phenyl substituents in the acetylenic branches facilitates the C -C photocyclization of acyclic enediynes, but any increase in steric hindrance raises the activation barrier and the photochemical yield is significantly lower than in the case of their cyclic... [Pg.122]

See other pages where Photo Bergman cycloaromatization enediynes is mentioned: [Pg.507]    [Pg.345]    [Pg.600]    [Pg.602]    [Pg.604]    [Pg.606]    [Pg.608]    [Pg.608]    [Pg.609]    [Pg.612]    [Pg.613]    [Pg.614]    [Pg.614]    [Pg.616]    [Pg.620]    [Pg.17]    [Pg.752]    [Pg.604]    [Pg.870]   
See also in sourсe #XX -- [ Pg.3 , Pg.10 ]



SEARCH



Bergman

Bergman enediynes

Enediyne

© 2024 chempedia.info