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2005
C-C bond formation
O 0282
Mild and Selective Palladium-Catalyzed Dimerization of Terminal Alkynes to
Symmetrical (Z,Z)-1,4-Dihalo-1,3-dienes. — In the presence of catalytic
12- 059 Form
amounts of PdX2 and 3 equiv. CuX2, terminal alkynes (I) undergo a highly regio- and
stereoselective dimerization to give the title dienes in good to quantitative yields. The
results show that the effect of solvent has a fundamental influence on the chemoselectivity of these reactions. The previously reported cyclotrimerization of alkyne (IV) occurs also under the present conditions. — (LI*, J.-H.; LIANG, Y.; XIE, Y.-X.; J. Org.
Chem. 69 (2004) 23, 8125-8127; Coll. Chem. Chem. Eng., Hunan Univ., Changsha,
Hunan 410082, Peop. Rep. China; Eng.) — Klein
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