2,4‐Di‐<i>tert</i>‐butyl‐1λ³,3λ³‐diphosphinines: Targeted Synthesis at Iron(0) Centers and Oxidative Release

Abstract

The [2 + 2 + 2] cycloaddition of two molecules of a phosphaalkyne and one molecule of a terminal alkyne in the coordination sphere of iron(0) affords 1,3-diphosphinines regiospecifically [Eq.(a)]. The coordinated and the oxidatively released 1,3-diphosphinines have cyclic delocalized π systems and are thus not only novel heteroarenes, but also of interest as potential catalysts.