Manganese(II) phthalocyanine fails to react with oxygen when dissolved in rigorously purified, dry pyridine. Reaction does occur, however, in pure '', '-dimethylacetamide to yield a solution of an oxygen adduct. The reaction may be reversed slowly by degassing, more rapidly upon exposure to bright white light or upon addition of an electron donor in vacuo. Addition of certain electron donors, in oxygen, causes conversion to the known PcMnm-0-MnnlPc. This oxy-bridged species may be reconverted to the oxygen adduct by reaction with oxygen. The oxygen adduct may be isolated as a solid. Analysis, thermodynamic measurements, infrared (oxygen-18 isotopic substitution) and electronic spectra, magnetism (5 = 3/2), and ESR appear consistent with the formulation (02)MnmPc, a bound superoxide.

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Rh(III)-Catalyzed Hydrative Cyclization of 1,6-Allenynes: Synthesis of Six--Membered Nitrogen and Oxygen Heterocycles. -The reaction proceeds in rarely reported fashion of 6-endo cyclization and affords dihydropiperidines and dihydropyrans. -(QUAN, S.; WANG, Y.; ZHENG, K.; TONG*, X.; Tetrahedron Lett. 56 (2015) 1, 215-217, http://dx.

Der Mn(II)‐ Komplex (I) reagiert in gereinigtem, wasserfreiem Pyridin nicht mit Sauerstoff.