Table 1.

Optimization of Reaction Conditions^a

Entry	Deviation from standard conditions	4:5:6:7b	Yield of 4ac
1	None	98:1:0.5:0.5	89% (80%)
2	(E)/(Z)-1 (1:1.2)	96:1:1:2	83% (75%)
3	45 or 80 °C (dark)	8:0:0:92	Trace
4	Without PdCl2	4:0:0:96	Trace
5	Without AgNTf2	91:5:2:2	48%d
6	Without Cs2CO3	62:29:7:2	44%

^a0.2 mmol scale; (E)-1:2:3 = 1:1.3:1.3.

^bDetermined by GC/MS using pentadecane as internal standard; 4a:4b > 20:1.

^cDetermined by ¹H NMR using dibromomethane as internal standard; isolated yields given in parentheses.

^dFormation of substantial amounts of radical dimerization products was observed.