Carbonylation products such as {TAIL ~ alkanoic anhydrides}, e.g., acetic anhydrides, are produced by carbonylation of esters and ethers in the presence of a rhodium or iridium catalyst and an iodine moiety in {HEAD ~ a reaction zone} wherein the reaction mixture is in a continuous boiling state 
Carbonylation products such as { TAIL ~ alkanoic anhydrides } , e.g. , acetic anhydrides , are produced by carbonylation of esters and ethers in the presence of a rhodium or iridium catalyst and an iodine moiety in { HEAD ~ a reaction zone } wherein the reaction mixture is in a continuous boiling state
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