... Organic Letters. ... Among the commonly used organic solvents we examined, t-BuOH and toluene/t-BuOH mixtures gave the best results (entries 1−6). We next tested other ... 2:2; Pd(OAc) 2 /CM-phos = 1:4; 90 °C for 16 h in the specified solvent (1.0 mL, total solvent volume) under ...