Stille-type aryl–aryl cross-coupling catalysis using triarylphosphine ligands with electron-rich Fe(ii)-alkynyl substituents

Abstract

The synthesis of four new phosphane ligands featuring electron-rich Fe(II) “(η²-dppe)(η⁵-C₅Me₅)FeCC-” substituents in para and meta position(s) on the aryl rings (1–4) is reported along with those of the corresponding PdCl₂(PAr₃)₂ precatalysts (7–10). These precatalysts have then been tested in a Stille-type aryl–aryl cross coupling reaction. It is shown that these new ligands survive the reaction conditions and perform at least as well as the classic triphenylphosphine ligand for this transformation.