Discussion
An intermediate formed during the hydroformylation of olefins using Co2(CO)8 as catalyst is
Answer: D
The intermediate is HCo(CO)4.
In the cobalt oxo process, Co2(CO)8 reacts with H2 to give the hydride HCo(CO)4, an 18-electron species. It loses one CO to form the 16-electron HCo(CO)3, which binds the olefin, inserts it into the Co-H bond, takes up CO, inserts that into the Co-alkyl bond to form an acyl, and finally releases the aldehyde by hydrogenolysis, regenerating HCo(CO)4.
HCo(CO)6 would be a 22-electron complex. H4Co(CO)3 and H2Co(CO)4 are not intermediates of the accepted (Heck-Breslow) cycle, whose catalyst-carrying species is the tetracarbonyl hydride.
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