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