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2005
C-C bond formation
O 0282
The Effect of Vicinyl Olefinic Halogens on Cross-Coupling Reactions Using Pd(0)
— Cross-coupling reactions of olefins bearing halogen substituents are in05- 048 Catalysis.
vestigated under different conditions to afford mono coupled products. Only substrate
(I) reacts under all reaction conditions used. Product (VII) is obtained either by Sonogashira coupling or Negishi conditions with slightly improved yields. Sonogashira reaction of dihalide (VIII) with alkyne (VI) results in formation of (IX). Under Negishi
conditions, the desired coupling product (X) is isolated. — (ORGAN*, M. G.;
GHASEMI, H.; VALENTE, C.; Tetrahedron 60 (2004) 42, 9453-9461; Dep. Chem.,
York Univ., North York, Toronto, Ont. M3J 1P3, Can.; Eng.) — S. Adam
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