Manganese complexes, preparations

Photolysis of cationic alkoxycarbene iron complexes [193] or alkoxycarbene manganese complexes [194] has been used to replace carbonyl groups by other ligands. The alkylidene ligand can also be transferred from one complex to another by photolysis [195], Transfer of alkylidene ligands occurs particularly easily from diaminocarbene complexes, and has become a powerful synthetic method for the preparation of imidazoline-2-ylidene complexes [155,196]. 

Manganese complexes capable of oxidizing water have been prepared and investigated. 

This iron complex, which is soluble in organic solvents, can be prepared in the pH range 6.5 to pH 5. No degradation to a2-[P2W17O61]10 and free heterometal was observed as in the case of the manganese complex. 

Reversible adsorption and desorption of the acetylene is possible under suitable conditions. However, using the corresponding low molecular weight manganese complexes such as MeCpMn(CO)3 and CpMn(CO)3 (Cp = cyclopentadienyl ring), the acetylene complex could hardly be prepared due to instability of the acetylene complex. 

These stable-in-air compounds are versatile precursors for the preparation of a wide range of new complexes. For example, manganese complex 120a is easily transformed into [ij6-phenylsilatrane)Mn(CO)2P(OMe)3]C104 (120b) via a photochemical reaction with P(OMe)3374. 

Bis(alkyl) complexes, with mercury, preparation, 2, 428 Bis(alkylidene)s, in Ru and Os half-sandwiches, 6, 583 Bis(alkylimido) complexes, with chromium(VI), 5, 346 Bis(rj2-alkyne)platinum(0) complexes, preparation, 8, 640 Bis(alkynyl) complexes in [5+2+l + l]-cycloadditions, 10, 643 with manganese, 5, 819 with mercury, preparation, 2, 426 mononuclear Ru and Os compounds, 6, 409 with platinum, 12, 125 with platinum(II), 8, 539 with titanium(IV), 4, 643 with zirconium, 4, 722... 

Homoleptic germylenes, preparation and properties, 3, 773 Homoleptic lanthanide(II) alkyl compounds, properties, 4, 4 Homoleptic manganese aryl complexes, preparation, 5, 816 Homoleptic manganese isonitrilates, preparation, 5, 773—774 Homoleptic molybdenum complexes, preparation and characteristics, 5, 514... 

Manganese carbenes, preparation, 5, 825 Manganese carbonyl complexes with 776-arene complexes, 5, 787 cyclopentadienyl complexes, 5, 783 with hydrocarbon ligands, complexes, 5, 776 synthesis and characteristics, 5, 761 Manganese carbonyl halides, applications and reactivity,... 

The rhenium analog can be prepared by a similar route (302 ). However, unlike the manganese complex, (r/ -CsHjlRelCOMl i] readily disproportionates to the dinitrogen and ammonia complexes at room temperature. 

Asymmetric epoxidation of alkenes. Two groups have prepared chiral (salen)-manganese complexes such as 2 from ( + )- or (-)-l and salicylaldehyde derivatives... 

Manganese complexes provide sufficient induction for synthetic utility for the preparation of unsubstituted epoxides (Scheme 22.9) (Chapter 9).1318 The manganese(III)salen complex 6 can also use bleach as the oxidant rather than an iodosylarene.19-20... 

Irradiation of manganese azides derived from Mn(III) porphyrin, cyclam, and polyamide complexes represents one of the earliest methods reported for the preparation of nitrido manganese complexes (Eq. (40)) [50], Additional methods have become available for the synthesis of manganese nitrides that utilize ammonia in combination with oxidants such as Cl2, PhIO, NaCIO, and NBS (Eq. (41)) [51-53]. Employing these methods, the manganese nitrides incorporating porphyrin, phath-locyanine, cyclam, salen, and bidentate Schiff base complexes have been documen-... 

Very recently, Jprgensen s group reported the preparation of some chiral nitrido-manganese complexes, which closely resemble those synthesized by the authors group, and the application to asymmetric amination of silyl enol ethers with the chiral complexes using Carreira s method [35], These results were very similar to those of the authors [22]. 

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