Abstract
The reaction between CpFe(CO) 2 I, hydroxy- or aminoalkynyl stannanes, and PdCl 2 (CH 3 CN) 2 (8.0 mol. %) generates a reactive iron-alkynyl intermediate that reacts in situ with RCHO/BF 3 ·Et 2 O to yield an iron oxa- or azacarbeniums quantitatively, further producing oxygen- and nitrogen heterocycles in high yields after Me 3 NO-oxidation of these carbenium salts.