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Bismetallic

Carbomagnesiation of alkenyllithium with allylmagnesium bromide gives rise to gem-bismetallic derivatives 5553. Chlorination of 55 with benzenesulfonyl chloride and treatment with alkyllithium (2 equiv) afford the alkylation product 57 in good overall yield (equation 31)54. A mechanism involving 1,2-migration of the formed intermediate zincate carbenoids 56 has been proposed for this reaction. [Pg.698]

The allylmetallation of an alkynyl metal leads to a vinylic 1,1-organogem-bismetallic derivative,22 and the stereoselective reaction of this latter with different electrophiles gives a new access to the synthesis of stereodefined poly-substituted olefins, as single stereoisomers23 (Equation 7.6 and Protocol 10). [Pg.121]

Allylmetallation of vinyl lithium derivatives and alkenylation of the resulting bismetallics preparation of ( )-1-phenyl-3-butyl-1,5-hexadiene... [Pg.123]

Scheme 25 NHC/Pd-catalyzed bismetallative cydization of enyne with Bu3SnSiMe3... Scheme 25 NHC/Pd-catalyzed bismetallative cydization of enyne with Bu3SnSiMe3...

See other pages where Bismetallic is mentioned: [Pg.220]    [Pg.330]    [Pg.615]    [Pg.625]    [Pg.641]    [Pg.643]    [Pg.645]    [Pg.647]    [Pg.649]    [Pg.651]    [Pg.653]    [Pg.655]    [Pg.657]    [Pg.659]    [Pg.661]    [Pg.663]    [Pg.665]    [Pg.667]    [Pg.669]    [Pg.671]    [Pg.673]    [Pg.675]    [Pg.677]    [Pg.679]    [Pg.680]    [Pg.681]    [Pg.684]    [Pg.1113]    [Pg.819]    [Pg.119]    [Pg.119]    [Pg.121]    [Pg.123]    [Pg.125]    [Pg.127]    [Pg.129]    [Pg.131]    [Pg.133]    [Pg.135]    [Pg.137]    [Pg.69]    [Pg.329]   
See also in sourсe #XX -- [ Pg.119 ]




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1,1-Bismetalated species

1,1-Bismetalated species reactions

Bismetallic reagent

Preparation and reactions of l,n-bismetallic reagents

Vinylic-allylic bismetallic species

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