Table 1.

Optimization of Pd Source.

entry	Pd source	additive	time	yieldb
1.	Pd(nbd)Cl2	none	24 h	7%
2.	PdCl2	none	24 h	27%
3.	Pd(OAc)2	none	24 h	76%
4.	Pd(TFA)2	none	60 min	87%
5.	Pd(TFA)2	Na2CO3	20 min	95%
6.	Pd(dba)3	none	24 h	25%
7.	Pd Black	none	24 h	NR
8.	None	none	24 h	NR
9.	Pd(TFA)2	None, no O2	24 h	24%
10.c	Pd(TFA)2	Na2CO3, Hg0	5 h	84%d

^a5 mol% Pd source, 20 mol% pyridine, 500 mg/mmol MS3Å, 1 atm O₂, toluene (0.1M), 80 °C.

^bIsolated yield.

^c5 mol % (pyridine)₂Pd(TFA)₂, 10 mol% pyridine, 2 equiv Na₂CO₃, 30 equiv Hg⁰.

^dConversion determined by GC.