In acetone, dioxane and EtOAc, the activity is enhanced at low pressure, but selectivity increases with pressure (Table , entries 13-15, 19-24). In DME, yields average around 70-75%, but higher selectivity is achieved at high CO pressure (Table , entries 16-18, 28-30). Considering its performances, DMF is not suitable for this reaction (less of 5% of yield, and very low selectivity, Table , entries 28-30). In MeCN and THF, the optimal reactivity is obtained under moderate pressure (15 bar, Table ).