Methane conversion enabled by iron catalyst delivers pharmaceutical compounds
Methane, ethane, and propane are the primary components of natural gas. Though widely used as fuel, their chemical stability previously limited their conversion into valuable products for industry. The CiQUS team, led by Martin Fananas, reports direct transformation of methane into dimestrol, a non-steroidal estrogen, using a method published in Science Advances. Their approach provides new routes for industry to generate complex molecules from methane.
The process introduces an allyl group onto the gas molecule, creating an anchor for subsequent chemical synthesis steps. One challenge was preventing chlorination byproducts that disrupt reactions. The team engineered a supramolecular catalyst based on tetrachloroferrate anion stabilized by collidinium cations, controlling radical reactivity and hydrogen bonding around iron.
"The core of this breakthrough lies in designing a catalyst based on a tetrachloroferrate anion stabilized by collidinium cations, which effectively modulates the reactivity of the radical species generated in the reaction medium," explained Fananas. "The formation of an intricate network of hydrogen bonds around the iron atom sustains the photocatalytic reactivity required to activate the alkane, while simultaneously suppressing the catalyst's tendency to undergo competing chlorination reactions. This creates an optimal environment for the selective allylation reaction to proceed."
The system uses iron instead of precious metals and operates under mild conditions powered by LED light.
In related work, the group showed that acid chlorides can be coupled with gaseous alkanes in a single photocatalytic step to give industrial ketones. These studies establish new methods to transform natural gas into chemical intermediates with industry applications.
Research Report:Attenuated LMCT photocatalysis enables C-H allylation of methane and other gaseous alkanes
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Center for Research in Biological Chemistry and Molecular Materials (CiQUS)
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