Plant growth‐regulating activity of α‐([sydnon‐ and sydnone imin]‐4‐yl‐thio)acetylferrocenes

The convenient method for the synthesis of α‐([sydnon‐ and sydnone imin]‐4‐yl‐thio)acetylferrocenes was elaborated. A growth‐regulating activity of these ferrocene derivatives as well as their antidote activity against Metsulfuron‐Methyl (Zinger WP) herbicide was investigated in vegetation experiments on corn seedlings. The high dose‐dependent growth regulating activity of a number of the ferrocenes bearing a mesoionic heterocyclic substituent (sydnone or sydnone imine) was discovered. A convenient preparative method for the synthesis of a wide range of α‐([sydnon‐ and sydnone imin]‐4‐yl‐thio)acetylferrocenes was developed. The high dose‐dependent growth‐regulating activity of these derivatives of ferrocene was discovered in vegetation experiments on corn seedlings.