Table 1.

entrya	allene	alkyne	yield (%)	E:Zb	1,4-diene
1		13	87	□ 1:20
2			66	□ 1:20
3			48	□ 1:20
4			62	□ 20:1

^aTypical reaction conditions: alkyne (1.4 eq), ClTi(Oi-Pr)₃ (2.1 eq), c-C₅H₉MgCl (4.2 eq),PhMe (−78 to −30 °C), cool to −78 °C then add allenyl alkoxide (1 eq), (−78 to 0 °C).

^bSelectivity refers to the olefin formed from the allene coupling partner.

^crs = 4:1.

^drr = 2:1.