Ten ferrocenylformyl 1,1′ dialkylferrocenes were sythesized by Friedel Crafts acylation of 1,1′ dialkylferrocenes and the respective isomers were isolated by column chromatography. The relations between the properties of the compounds to their structures and α /β isomer ratios have been studied by elemental analysis, IR and 1H NMR. 1,1-dialkylferrocenes and the individual isomers were isolated by column chromatography. The relations between the properties of the compounds to their structures and α / β isomer ratios have been studied by elemental analysis, IR and 1 H NMR.