Table 1.

Effects of Catalyst and Additive on Z/E Ratios in 2^a

entry	catalyst	2 / 3 / 4b	2, Z / Ec
1	Pd(PPh3)4	39/31/30	98/2
2	PdCl2(PPh3)2	53/32/15	98/2
3	PdCl2 + 3P(2-Fur)3	80/3/17	98/2
4	PdCl2 + 3P(2-Tol)3	96/2/2	99/1
5	PdCl2(Amphos)2d	88/<1/12	68/32
6	Pd[P(t-Bu)3]2	38/26/36	73/27
7	PdCl2(PCy3)2	95/4/1	33/67
8	PEPPSI	55/33/12	45/55
9	PdCl2(PCy3)2 + 3PPh3	73/9/18	98/2
10	PdCl2(PPh3)2 + TMEDAe	99/<1/<1	>99/1
11	PdCl2(PPh3)2 + Et3Nf	79/5/16	98/2

^aConditions: alkylzinc iodide (1.1 mmol, 1.0 M in THF), vinyl iodide (1 mmol), Pd catalyst (2 mol %). Reactions were run at 0.33 M at rt, 4 h (24 h for entries 10 and 11).

^bby GC.

^cZ/E-ratio determined by NMR or GC on crude material.

^dDefined as dichloro-bis(p-dimethylaminophenyl-di-tert-butylphosphine) palladium(II).

^e1.1 equiv.

^f2.2 equiv.