2,6-Difluorocinnamic aldehyde (CAS number 117338-43-9) is a cinnamaldehyde derivative with fluorine substituents at 2- and 6-position. 2,6-Difluorocinnamic aldehyde includes a propenal functional group, allowing it to engage in conjugative addition with Gillman reagents and direct addition onto the aldehyde using Grignard reagents. 2,6-Difluorocinnamic aldehyde reacts with methylbenzimidazole through nucleophilic substitution for antimicrobials, yielding antimicrobial compounds with demonstrated potency of 32 µg/mL.

When subjected to an oxidative condensation reaction catalyzed by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), 2,6-difluorocinnamic aldehyde and dipyrromethene yield hexaphyrin molecules. Notably, the alkene moiety present in 2,6-difluorocinnamic aldehyde proves advantageous for ruthenium-catalyzed C-H activations.

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