A photocatalytic synthesis of homoallyl
ketones was achieved via
a one-pot procedure starting from a Norrish Type I reaction of cyclopentanones,
followed by a decatungstate-catalyzed hydroacylation of electron-deficient
olefins by the resulting 4-pentenals. The site-selective formyl H-abstraction
in the second step can be explained by radical polar effects in the
transition state
