AbstractThe proton and carbon‐13 NMR spectra of thirteen trialkylmetal derivatives of pyridine, several of which were previously unknown, have been recorded and analysed. The proton NMR spectra show variations in proton chemical shifts but not in proton‐proton coupling constants when the metal substituent is changed; the ring proton‐metal coupling constantsnJ(MH) in the tin and lead derivatives correspond closely with the corresponding proton‐proton couplingsnJ(HH) in pyridine. The carbon‐13 chemical shifts of the carbons bound to the metal can apparently be correlated with the electron‐donating ability of the trialkylmetal group. In the trimethylstannylpyridines the value of1J(SnCring) varies greatly with the position o