T 1401 Das Anhydrid der 4‐tert.‐Butylphthalsäure (I) wird mit Hanrstoff auf ca. 170°C erhitzt; es entsteht das Imid (II), das man durch Behandlung mit Ammoniak zum tert.‐Butylphthalsäurediamid (III) spaltet.

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cis-Stilbene (cSt) and 1,1-diphenyl-2-picrylhydrazine (DPPH) were used as substrates for kinetic investigations of the catalytic system based on Mn III -porphyrins and peracetic acid in CH 3 CN. Catalysts employed were tetra-(2,6-dichlorophenyl)-porphyrinatomanganese chloride (TDCPPMnCl) 5, octanitrophthalocyaninatomanganese chloride (NO 2 PcMnCl) 6 and tetra(tert-butyl)tetraazaporphyrinatomanganese chloride (TAPMnCl) 7. It was found that for all these catalysts the first step of the reaction mechanism is the formation of an adduct 'A' between the catalyst and AcOOH in a reversible way (k 1 /k Ϫ1 ), followed by an irreversible stage (k 2 ) for the formation of Mn V -oxo species. The oxidative capability of the adduct 'A' was found to be dependent on the electronic structure of the catalyst, while the reactivity of Mn-oxo species is only slightly influenced by catalyst structure. The formation of the high-valent Mn-oxo species is the rate-determining step of alkene epoxidations as demonstrated by the same k 2 value obtained with catalyst 6 in the epoxidation of cSt and trans-stilbene (tSt). Catalyst stability was found to be dependent on solvent polarity, CH 3 CN being the best reaction medium.