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Di-w-methane photorearrangement

This regioselective example of a di-w-methane photorearrangement is of particular importance because in this case both n moieties have very similar singlet energy levels. This suggests that excitation localization does not control the reaction. [Pg.477]

Upon low conversion direct photolysis the cis isomer (10) gave only the cis isomer (12) and the trans isomer (11) gave only the trans isomer (13). The triplet sensitized reaction of (10) and (11) gave rise only to cis-trans isomerization. Thus the di-ir-methane photorearrangement from the triplet state cannot compete with triplet state deactivation via cis-trans isomerization (Zimmerman has termed this the free rotor effect). Several other examples of regio-specilicity and stereospecificity in di-w-methane photoreactions are as followsa8 a3) ... [Pg.477]

See other pages where Di-w-methane photorearrangement is mentioned: [Pg.305]    [Pg.305]    [Pg.305]    [Pg.477]    [Pg.517]    [Pg.305]    [Pg.305]    [Pg.305]    [Pg.477]    [Pg.517]    [Pg.296]    [Pg.632]   
See also in sourсe #XX -- [ Pg.193 ]

See also in sourсe #XX -- [ Pg.193 ]



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Photorearrangements

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