This report contains recent results which help clarify previous ambiguities about some aspects of Mn(III) coordination chemistry.1 These results clearly demonstrate the expected formation of distorted octahedral complexes of high-spin Mn(III)-a result contrary to some published structural work.2 This distortion, which frequently manifests itself in the form of a tetragonal elongation, is probably responsible for the ready incorporation of Mn(III) into porphyrins.34 The results reported herein also tend to contradict to some extent those which report high-spin octahedral manganese(III) porphyrins containing a very tightly cotí) See, for instance, F. A. Cotton and G. Wilkinson, "Advanced

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Die Komplexe (I) wurden ausgehend von dem Dihydroxo‐bis‐[acetylacetonato]‐mangankomplexion dargestellt, die Verbindungen (II) bilden sich durch Aufnahme von Donator‐Lösungsmittelmolekülen in die Koordinationssphäre.