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Grignard reagents to alkenes

Zirconocene dichlondc and related complexes catalyze the addition of trialkylaluminum compounds to tenninal acetylenes7 and olefins8 as well as the addition of ethyl, propyl, and butyl Grignard reagents to alkenes.9-12 These transformations occur with a high degree of regiosclectivity (cf. hydroboration), such that the metal atom always adds to the end position of a terminal multiple bond like that in 25. If addition is to a triple bond, M and R in the product are cis to each other... [Pg.254]

HETEROATOM-DIRECTED ADDITION Ol GRIGNARD REAGENTS TO ALKENES... [Pg.108]

Hcteroalom-directed Addition of Grignard Reagents to Alkenes 108... [Pg.217]

The most impressive array of new Grignard cyclization-cleavage rearrangement examples has come from studies on the intermolecular addition of Grignard reagents to alkenes. In 1975, Lehmkuhl and coworkers published extensive descriptions of their work in this area (46, 47). If an allylic Grignard reagent adds to an alkene, the addition product... [Pg.136]

The reactivity of addition reactions of straight-chain alkyl and aryl Grignard reagents to alkenes is not high, but the secondary or tertiary derivatives are reactive, and bulky organic group selectively bonds to the terminal carbon [26]. [Pg.54]

Addition of Grignard reagents to alkenes and alkynes is known to be promoted by the presence of hydroxy-functions near the multiple bonds. The... [Pg.18]

See other pages where Grignard reagents to alkenes is mentioned: [Pg.181]    [Pg.560]    [Pg.55]    [Pg.181]    [Pg.415]    [Pg.107]    [Pg.107]    [Pg.117]    [Pg.125]    [Pg.131]    [Pg.138]    [Pg.59]    [Pg.59]    [Pg.59]    [Pg.217]    [Pg.273]    [Pg.274]    [Pg.277]    [Pg.279]    [Pg.280]    [Pg.282]    [Pg.263]   
See also in sourсe #XX -- [ Pg.1026 ]



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Alkenes reagents

Stereoselective Addition of Grignard Reagents to Alkenes

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