Manganese compounds activity

Tri-n-octylphosphine oxide [78-50-2] M 386.7, m 59.5-60°, pK jt <0. Mason, McCarty and Peppard [J Inorg Nuclear Chem 24 967 7962] stirred an O.IM solution in benzene with an equal volume of 6M HCl at 40° in a sealed flask for 48h, then washed the benzene solution successively with water (twice), 5% aq Na2C03 (three times) and water (six times). The benzene and water were then evaporated under reduced pressure at room temperature. Zingaro and White [J Inorg Nucl Chem 12 315 7960] treated a pet ether solution with aqueous KMn04 (to oxidise any phosphinous acids to phosphinic acids), then with sodium oxalate, H2SO4 and HCl (to remove any manganese compounds). The pet ether solution was slurried with activated alumina (to remove phosphinic acids) and recrystd from pet ether or cyclohexane at -20°. It can also be crystd from EtOH. 

Radiochemical Yields in some Manganese Compounds, Following Neutron Activation... 

Copper and manganese compounds exhibit the highest inhibiting activity. 

Optically active organometallic compounds in which the transition metal is the center of chirality have been known since 1969, when the first manganese compounds were reported1. In the meantime cyclopentadienyl and carbonyl transition metal complexes with 4, 5 and 6 ligands have been obtained in optically active form for the following types of compounds (Scheme 1) ... 

The vinyl derivative was converted to ethynyl-CTM by reaction with bromine followed by HBr elimination. The double bond of vinyl-CTM turned out to be much less active than that in the ferrocene analog as regards electrophilic addition. Also, the stabilization of an a-carbonium center, the phenomenon characteristic of ferrocenyl cation, was not found in the manganese compound (379). 

Activity ratio diagrams provide a simple way to gain a first-hand impression on the meaning of equilibrium data with respect to the relative stability of phases. We illustrate here the approach with examples of stability relations of iron and manganese compounds. 

Example A8.1. Stability Relations of Iron and Manganese Compounds at pH = 7 Discuss the stability relations of Fe and Mn compounds with the help of activity ratio diagrams for the conditions pH = 7, HCO3" = 10 M, and S04 = 10" M. The equilibrium constants at 25°C can be obtained from the data on the free energy of formation in Appendix C at the end of the book. 

Manganese oxides are well-established oxidizing agents, which have been used for the conversion of cyclopropylmethyl alcohols to the corresponding carbonyl compounds. Activated manganese dioxide in an inert solvent has been employed to prepare aldehydes - as well as ketones,e.g. oxida-... 

Refs. 18, 113), and Zfiv 185,186 Aluminium compounds are of interest as possible precursors for the generation of catalytically active forms of AIF3 (cf Section 3.1) by thermal decomposition. Iron and manganese compounds are of interest because of their low-dimensional magnetic properties (see Section 4.1). 

AUylation. Manganese is activated by a catalytic amount of PbClj and MCjSiCl byway of removing the tightly bound metal oxide that coats the surface. The system is useful for aUylation of carbonyl compounds by allyl halides. 

Hage, R. et al., inventor, EP 0 549 271 Bleach activation using a manganese compound and an organic... 

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