DTBP/TBHP‐Promoted Hydroacylation of Unactivated Alkenes

Di-tert-butyl peroxide (DTBP)-promoted intermolecular hydroacylation reaction of alkenes with aromatic aldehydes providing ketones is described. In this work, 4-chromanones were formed when 2-(allyloxy)benzaldehydes were reacted with tert-butyl hydroperoxide (TBHP). The reactions were performed under solvent and metal-free conditions. Reactions proceeded through the generation of acyl radicals, followed by the reaction with alkenes. Remarkably, not only terminal alkenes but also internal alkenes could serve as the starting materials for intramolecular hydroacylation reaction.