SummaryClucosamine, galactosamine and mannosamine react with ferrocene-or ruthenocene-carbaldehyde, respectively to yield thecorresponding Schiff's bases, which are reduced at the C-N-bond and at the aldehyde function of the sugar moity.With 14C-labelled amino-sugars or 103Ru-labelled ruthenocenecarbaldehyde the labelled aminohexite compounds of the metallocenes are synthesized.