Ferrocene Derivatives Bearing one and two Isocyanato,Isothiocyanato and Isoselenocyanato Substituents

Isocyanato‐ ( 1a ), 1,1′‐di(isocyanato)‐ ( 2a ), isothiocyanato‐ ( 1b ), 1,1′‐di(isothiocyanato)‐ ( 2b ), isoselenocyanato‐ ( 1c ) and 1,1′‐di(isoselenocyanato)ferrocene ( 2c ) were prepared and studied by ¹H, ¹³C and ¹⁴N NMR spectroscopy. Isocyanatoferrocene ( 1a ) trimerizes upon chromatography on alumina to give 3a . The molecular structures of 2c and 3a were determined by X‐ray analysis, and almost undistorted ferrocene‐like structures were found in both cases.