Manganese, 9:6 complex with

Asymmetric epoxidation is another important area of activity, initially pioneered by Sharpless, using catalysts based on titanium tetraisoprop-oxide and either (+) or (—) dialkyl tartrate. The enantiomer formed depends on the tartrate used. Whilst this process has been widely used for the synthesis of complex carbohydrates it is limited to allylic alcohols, the hydroxyl group bonding the substrate to the catalyst. Jacobson catalysts (Formula 4.3) based on manganese complexes with chiral Shiff bases have been shown to be efficient in epoxidation of a wide range of alkenes. 

Manganese Manganese complexed with ammonium and diethyl am- Electrothermal AAS of Freon - [65,448]... 

Manganese Complexation with theonyl-trifluoroacetone and dibenzol-8-crown-6 AAS 0.1 pg/1 [875]... 

Tab. 1 Electrochemical properties of mononuclear manganese complexes with acyclic and other common ligands...

Tab. 2 Electrochemical data for manganese complexes with porphyrins, Schiff bases, and related macrocyclic ligands in nonaqueous media...

The mechanism of the reaction of the alcohol (or water) with the acyl complex to produce ester (or acid) and regenerate the cobalt hydride complex is not known. Because the reaction of the analogous manganese complex with alcohols is known to proceed through a hemiacetal-like complex, this mechanism has been written for the carboxylation reaction (equation 42). 

Manganese Complexes with Tied-Back Phosphites... 

Mn(III). Structurally characterized higher valent manganese complexes with phenoxide-type ligation are limited to Mn(III) and Mn(IV) Schiff base complexes (128-135), Mn(III) and Mn(IV) catecholates (136-139), Mn(III) and Mn(IV) salicylates (140-142), and Mn(III) bi-phenoxides (143). However, of these ligands, only biphenoxide is similar electronically to tyrosine Mn(III) complexes of these ligands, in general, lack the intense phenoxide - metal charge transfer band centered at 435 nm. 

From these two reactions two dimers are prepared with bridging hydrides. The total yield of H2Re2(CO)s is 50%. A manganese complex with one bridging diphenylphosphido group and a bridging hydride is prepared in low yield. ... 

Kinetics and mechanisms of dissociation of manganese complexes with porphyrins in mixed protolytic solvents 04MI14. 

An improved heterogenized manganese complex with more active sites as oxidation catalyst... 

For the synthesis of the first manganese complex with a phosphanylalkylcyclopentadienyl ligand, the... 

---