Abstract The two isomeric 3-methyl-4-furoxancarbaldehydes (2a) and 4-methyl-3- furoxancarbaldehyde (2b) have been prepared. Discussion of their structures, thermal equilibration and kinetic of thermal conversion from the 3-methyl to the 4-methyl isomer are also reported.(Phenylsulfonyl) hydrazones 3a and 3b have been prepared as derivatives in view of their potential antitumoral properties.
