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Disilacyclobutanes cycloreversion

Cycloreversions of a 1,2-disilacyclobutane (42) and a 1,2-digermacyclobutane (43) have been induced in solution both thermally and photochemically fragmentation of sterically congested (42) follows Scheme 5 paths a and b, respectively fragmentation of (43) yields (46) (which photodissociates to 48) in each case. " ... [Pg.402]

While several highly substituted 1,2-disilacyclobutanes are known to revert under very mild conditions to silenes , it is generally believed that 1,3-disilacyclobutanes need more drastic conditions to undergo the cycloreversion yielding silenes . Kinetic data for the pyrolyses of several 1,3-disilacyclobutanes (24, 47, 48) have been reported by Davidson and CO workers and are summarized in Table 2 . Silene formation was inferred from detection of trapping products with TMSOMe and HCl. It was found that methyl substitution at silicon slows down the pyrolysis rate. The initial process for the decomposition of... [Pg.866]

Apeloig and coworkers have trapped (Me3Si)2Si from the photoinduced [2 + 2] cycloreversion to (Me3Si)2Si=Si(SiMe3)2 and 2,2 -biadamantylidene of the corresponding 1,2-disilacyclobutane . Since laser flash photolysis experiments indicated that the disilene was the sole primary photoproduct, the silylene was believed to be formed by photodissociation of the disilene. [Pg.2499]


See other pages where Disilacyclobutanes cycloreversion is mentioned: [Pg.866]    [Pg.521]    [Pg.521]    [Pg.908]    [Pg.908]    [Pg.909]    [Pg.1051]    [Pg.1053]    [Pg.279]    [Pg.316]   
See also in sourсe #XX -- [ Pg.864 , Pg.865 , Pg.866 , Pg.867 , Pg.868 , Pg.869 ]

See also in sourсe #XX -- [ Pg.864 , Pg.865 , Pg.866 , Pg.867 , Pg.868 , Pg.869 ]




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1.2- Disilacyclobutanes

Cycloreversions

Disilacyclobutane

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