Fluorophosphoniums as Lewis acids in organometallic catalysis: application to the carbonylation of β-lactones‡
Literature Information
Marie-Hélène Pietraru, Louise Ponsard, Nicolas Lentz, Pierre Thuéry, Emmanuel Nicolas, Thibault Cantat
We describe the synthesis and characterisation of four organic Lewis acids based on fluorophosphoniums, with tetracarbonyl cobaltate as the counter-anion: [R3PF]+[Co(CO)4]− (with R = o-Tol, Cy, iPr, and tBu). Their catalytic activity was investigated for the carbonylation of β-lactones to succinic anhydrides. In the presence of [tBu3PF]+[Co(CO)4]− IV (3 mol%), 90% of succinic anhydride was afforded from β-propiolactone after 16 h at 80 °C, at a very mild pressure of 2 bar of carbon monoxide. Our study sets the first example of the use of a main-group cation as a Lewis acidic partner in the cobalt-catalyzed carbonylation of β-lactones.
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