Osmium oxides

Organic compounds, 322 Osmium, oxidation numbers, 414 Oswald, W., 65... 

A finely powdered solid sample of an osmium oxide (which melts at 40. °C and boils at 130.°C) with a mass of 1.509 g is placed into a cylinder with a movable piston that can expand against the atmospheric pressure of 745 Torr. Assume that the amount of residual air initially present in the cylinder is negligible. When the sample is heated to 200.°C, it is completely vaporized and the volume of the cylinder expands by 235 mL. What is the molar mass of the oxide Assuming that the oxide is OsOv, find the value of x. 

The oxidative cleavage of C=C bond is a common type of reaction encountered in organic synthesis and has played a historical role in the structural elucidation of organic compounds. There are two main conventional methods to oxidatively cleave a C=C bond (1) via ozonol-ysis and (2) via oxidation with high-valent transition-metal oxidizing reagents. A more recent method developed is via the osmium oxide catalyzed periodate oxidative cleavage of alkenes. All these methods can occur under aqueous conditions. 

Osmic Acid Anhydride Osmium Oxide Osmium Tetraoxide Osmium Tetroxide OU1 Dry Agent ... 

Table 4.20. Optimized geometrical parameters, metal charge (Qm) and Lewis accuracy (%pi) of tungsten and osmium oxides (4.64a)-(4.64e) see Fig. 4.30...

Osmium tetroxide Osmium oxide (8) Osmium oxide, (T-4)- (9) (20816-12-0)... 

OsOF5 OSMIUM OXIDE PENTAFLUORIDE 18125.3278 -4.6581E+05 -7.4493E+03 6.8812E+00... 

The reaction between Os3(CO),2 and silica and alumina has been the object of different studies. Appropriate thermal treatment under argon of the OssjCOjn initially physisorbed leads to [Os3(CO)io( t-H)( t-OSi)] or [Os3(CO)io(n-H)(p-OAl)] surface species that are similar to those obtained from RusjCOjn [129, 130]. An increase of temperature can produce osmium oxidation by the hydroxyl groups and the breaking of the Os-Os bonds, resulting in a surface carbonyl species of Os(II), Os (CO) ( = 2 or 3), surface anchored fragments that in the case of alumina have been characterized by EXAFS [131, 132]. 

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When bulky alkenes are used, addition of a second alkene molecule to produce an oxo-bis(l,2-diolato)osmate(VI) 7 is preferred. Subsequent osmium oxidation and hydrolysis releases the 1,2-diol and regenerates the trioxo(l,2-diolato)osmate(VIII) 4 that can reenter the catalytic cycle. In this latter case amine addition has no major effect. Proof for the existence of species of type 7 (X-ray) as well as for the catalytic properties of 4 have recently been provided38. 

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