An oven-dried 25 ml pressure flask was charged in a glovebox with Pd2dba3 (228.9 mg, 0.25 mmol, 1.0 Pd eq.), PCy3 (336.5 mg, 1.2 mmol, 2.4 eq.), 2,6-dimethyliodobenzene (87 L, 0.6 mmol, 1.2 eq.), benzene (5 mL) and a stirbar. The flask was sealed, removed from the glovebox and the purple solution was stirred at room temperature for 16 h yielding a dark orange solution with pale green insolubles. Solvent was removed under reduced pressure, then the solids were dissolved in DCM (100 mL) and filtered to removed Pd black. Solvent was removed under reduced pressure, then the solids washed with dry acetone until the washings were colourless. The solids were then recrystallized from DCM/acetone, yielding 14d as white crystals (247.2 mg, 0.275 mmol, 55.0% wrt Pd).