Synthesis, structure elucidation of β-chloroferroceneacroleins and β,β′-dichloro-1,1′-ferrocenediacroleins, and their α-phenyl- and α,α′-diphenylderivatives. Attempts on E/Z isomerisation of α-phenyl-β-chloroferroceneacrolein and α,α′-diphenyl-β,β′-dichloroferrocenediacroleins.