Carbonylations Insertion reaction

nucleophilic insertion , rearrangement of square planar complex

such reactions subject usual parameters affect other reactions in coordination chemistry, steric effects important in determining stereochemistry , regiochemistry of reactions. reverse reaction, de-insertion of co , alkenes, of fundamental significance in many catalytic cycles well.

widely employed applications of migratory insertion of carbonyl groups hydroformylation , carbonylative production of acetic acid. former converts alkenes, hydrogen, , carbon monoxide aldehydes. production of acetic acid carbonylation proceeds via 2 similar industrial processes. more traditional rhodium-based monsanto acetic acid process, process has been superseded iridium-based cativa process. 2002, worldwide annual production of acetic acid stood @ 6 million tons, of approximately 60% produced cativa process.

the cativa process catalytic cycle, shown above, includes both insertion , de-insertion steps. oxidative addition reaction of methyl iodide (1) involves formal insertion of iridium(i) centre carbon-iodine bond, whereas step (3) (4) example of migratory insertion of carbon monoxide iridium-carbon bond. active catalyst species regenerated reductive elimination of acetyl iodide (4), de-insertion reaction.