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Zirconium Reagents. Ethenylation can be effected via hydrozirconated terminal alkynes (Scheme 83). The alkenylzirconocene gives the -aUcenyl product. The reaction is carried out in the presence of zinc chloride. Presumably metal metathesis occurs before the palladium-mediated coupling takes place. The coupling is regiospecific with initial... [Pg.468]

See other pages where Palladium mediated coupling regiospecificity is mentioned: [Pg.366] [Pg.172] [Pg.172]

See also in sourсe #XX -- [ Pg.10 , Pg.341 ]

See also in sourсe #XX -- [ Pg.10 , Pg.341 ]