Peroxide synthesis, manganese acetate

Dioctyltin diisooctylthioglycollate catalyst, PU two-pack coatings Dibutyltin bis (laurylmercaptide) catalyst, PU elastomers Ferric acetylacetonate N-Hydroxyethy I pi perazi ne catalyst, purified terephthalic acid polyesters Manganese acetate (ous) catalyst, PVC suspension polymerization Lauroyl peroxide catalyst, pyridine synthesis Cobaltocene... 

Figure 9.9 Synthesis of DHP using the Zutropf method with peroxidase and hydrogen peroxide or manganese(III)-acetate in acetic acid with or without the presence of water. The biomimetic DHPs were fully acetylated and the high molecular weight fraction obtained after chromatography on polystyrene gel [46].

The ring synthesis of the tetrahydro-1,3-azoles is simply the formation of N,N-, N,0-or A, S-analogues of aldehyde cyclic acetals the ring synthesis of the 4,5-dihydro-heterocycles requires an acid oxidation level in place of aldehyde. A good route to the aromatic systems is therefore the dehydrogenation of these reduced and partially reduced systems. Nickel peroxide, " manganese(IV) oxide, copper(II) bromide/ base, and bromotrichloromethane/diazabicycloundecane have been used. The example shown uses cysteine methyl ester with a chiral aldehyde to form the tetrahydrothiazole. 

In order to prepare structmally interesting azabicycUc peroxides, the synthesis of dumbbell-type compoimds, which connected two azabicyclic peroxides in the methylene or oxamethylene chain, was attempted since such bioactive peroxides have been isolated from some marine sponges (Fig. 2) [1,2,24,25]. Dialkyl N,AT -oligomethylenebis(2,3-pyrrolidinedione-4-carboxylate)s were allowed to react with 1,1-diarylethenes in the presence of manganese(III) acetate in a dry air stream. Although a long reaction... 

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