The selectivity of the carbonylation of PL to SA is then quite sensitive to the temperature. Interestingly, increasing the CO pressure prevented this selectivity drop: 95% of SA was afforded at 130 °C, after 3 h under 50 bar of CO (Table , entry 8). The latter result indicates the interdependency between pressure and temperature. Finally, some catalytic activity was observed at temperatures as low as 70 °C and 50 °C (82% yield of SA after 65 h and 51% yield of SA after 65 h, respectively. See S.I. for details).