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Halogen compoundsQ 0090 Titanium(IV) Halide Mediated Coupling of Alkoxides and Alkynes: An Efficient

and Stereoselective Route to Trisubstituted (E)-Alkenyl Halides. — The reaction is most effective using TiCl4 or TiBr4. High (E)-selectivity is observed for aromatic al-kynes, while aliphatic ones afford a mixture of the stereoisomers [cf. (X)/(XI)]. — (YAO, M.-L.; QUICK, T. R.; WU, Z.; QUINN, M. P.; KABALKA*, G. W.; Org. Lett. 11 (2009) 12, 2647-2649; Dep. Chem., Univ. Tenn., Knoxville, TN 37996, USA; Eng.) — R. Steudel

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