Rhenium compound

Rhenium hexafluoride [10049-17-9J, ReF, is a pale yeUow soHd at 0°C, but a Hquid at ambient temperature. In the presence of moisture it hydroly2es rapidly forming HF, Re02, and HRe04 (see Rheniumand rhenium compounds). It is not safe to store ReF in a glass trap or glass-lined container. Leaks in the system can initiate hydrolysis and produce HF. The pressure buildup causes the system to burst and an explosion may result. 

Propylene oxide is also produced in Hquid-phase homogeneous oxidation reactions using various molybdenum-containing catalysts (209,210), cuprous oxide (211), rhenium compounds (212), or an organomonovalent gold(I) complex (213). Whereas gas-phase oxidation of propylene on silver catalysts results primarily in propylene oxide, water, and carbon dioxide as products, the Hquid-phase oxidation of propylene results in an array of oxidation products, such as propylene oxide, acrolein, propylene glycol, acetone, acetaldehyde, and others. 

A survey of known types of rhenium compounds is presented in Table 2. The selected examples include a number of commonly encountered compounds and emphasize the diversity in stmctures. 

Rhenium compounds as catalysts, 136, 137, 141, 144, 146, 148, 150 Ring-opening polymerization, 143 catalysts for, 140 thermodynamics of, 156 Rotary engine, 123... 

The addition, therefore, follows Markovnikov s rule. Primary alcohols give better results than secondary, and tertiary alcohols are very inactive. This is a convenient method for the preparation of tertiary ethers by the use of a suitable alkene such as Me2C=CH2. Alcohols add intramolecularly to alkenes to generate cyclic ethers, often bearing a hydroxyl unit as well. This addition can be promoted by a palladium catalyst, with migration of the double bond in the final product. Rhenium compounds also facilitate this cyclization reaction to form functionalized tetrahydrofurans. 

Pt(II)(8-quinolinolate), Tb(III)(TTFA)3(o-phen) with TTFA = thenoyltrifluoroacetonate and o-phen = 1.10— phenanthroline, Tb(III)(TTFA) , and Eu(III)(TFFA)3 (o-phen). An eel of Re(o-phen)(CO)3C1 occured during the electrolysis of tetralin hydroperoxide in the presence of the rhenium compound. The mechanism of these electrochemical reactions is discussed. 

Oxygen Transfer Reactions Catalysis by Rhenium Compounds James H. Espenson... 

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