The Novel 1-Aza-di-π-methane Rearrangement of 1-Substituted-1-aza-1,4-dienes Promoted by DCA-Sensitization.

Abstract Irradiation of a series of N -substituted-1-aza-1,4-dienes, using DCA as an electron transfer sensitizer, leads to the formation of the corresponding cyclopropane derivatives, in the second example of a rearrangement of the di-π-methane type that takes place in the ground state of radical-cation intermediates.