Hydroformylation

Hydroformylation is a chemical process in which an unsaturated carbon‑carbon bond of an alkene reacts with synthesis gas—a mixture of carbon monoxide and hydrogen—to install a formyl group, giving an aldehyde. In the reaction the double bond is broken, a hydrogen atom adds to one carbon and a –CHO fragment attaches to the other, so the product gains both a new carbon–oxygen double bond and an extra hydrogen. The transformation is usually carried out in the presence of a transition‑metal catalyst such as rhodium or cobalt, which speeds up the otherwise sluggish addition of the gaseous reagents.

The importance of hydroformylation lies in its ability to turn relatively cheap, readily available alkenes into more versatile aldehydes that serve as building blocks for a wide range of chemicals. Those aldehydes can be further reduced to alcohols, oxidized to acids, or coupled with other fragments to form polymers, fragrances, pharmaceuticals and fuel additives. Because the reaction works on large scales under relatively mild conditions, it has become a cornerstone of modern industrial chemistry, allowing manufacturers to convert petroleum‑derived olefins into high‑value intermediates efficiently.

You will find hydroformylation taking place in plants that produce specialty chemicals such as plasticizers and detergents, in factories that make fragrance compounds like cinnamaldehyde, and in the synthesis routes for many drug precursors. The process also appears in academic laboratories where chemists explore new catalyst systems to improve selectivity or to enable the use of renewable feedstocks. In each setting, the core idea remains the same: a catalytic addition of carbon monoxide and hydrogen across an alkene double bond to forge a useful aldehyde.