Synthesis Enabled by E-to-Z Isomerization Using CBZ6 as Energy Transfer Photocatalyst.

The reactions of Z -isomers and E -isomers usually are different in consideration of the regioselectivity of chemoselectivity. The syntheses of Z -isomers are not feasible in many cases. The energy transfer (EnT) E / Z -photoisomerization might yield the Z -isomers. In this work, CBZ6 was proven to be an EnT photocatalyst for the E → Z -isomerization of C-C or C-N double bonds. The transformations of in situ generated Z -isomers of oximes and stilbenes consequently afforded the desired reversed Beckmann rearrangement products and phenanthrenes, respectively.