M. Alami et al., A STEREOSELECTIVE ROUTE TO 1-CHLORO-1-HALO-ENYNES, VERSATILE PRECURSORS FOR THE SYNTHESIS OF CHLOROENEDIYNES AND ENETRIYNES, Tetrahedron letters, 36(21), 1995, pp. 3687-3690
1-Chloro-1-halo-enynes, readily available by metallation of (E)-chloro
enynes, undergo sequential coupling with terminal alkynes under Pd-cat
alysis to produce stereoselectively chloroenediynes and enetriynes in
good yields.