Solvents olefins

KMnO. In neutral solution with Ahquat 336 and ben2ene as organic solvent, olefins yield carboxyUc acids (1,29). 

Mono-, di-, and trisubstituted olefins undergo osmium-catalyzed enantioselective dihydroxylation in the presence of the (R)-proline-substituted hydroquinidine 3.9 to give diols in 67-95% yields and in 78-99% ee.75 Using potassium osmate(VI) as the catalyst and potassium carbonate as the base in a tm-butanol/water mixture as the solvent, olefins are dihydroxylated stereo- and enantioselectively in the presence of 3.9 and potassium ferricyanide with sodium chlorite as the stoichiometric oxidant the yields and enantiomeric excesses of the... 

In halogenated solvents, olefin bromination is second-order in bromine... 

To summarize, when the kinetic data predict that only bromonium ions or only bromocarbocations are formed, the bromination products are obtained stereospecifically and regiospecifically, respectively, whatever the solvent. Olefin brominations involving open intermediates lead to more solvent-incorporated products in methanol or acetic acid than those involving bridged ions. This chemoselectivity can be interpreted in terms of the hard and soft acid and base theory (Dubois and Chretien, 1978). Methanol assistance to intermediate formation also plays a role in determining product-selectivity (Ruasse et al, 1991). 

MeOH solvent olefin/H202 molar ratio = 5 data taken from M.G. Clerici and P. Ingallina, J. Catal., 140(1993)71. 

Monomer Catalyst/Solvent olefin Stereochemistry Tacticity... 

The TP olefin elastomers are available in several grades having a room-temperature hardness from 60 Shore A to 60 Shore D. They have the lowest density of all the TPEs, and their cost is in the mid-range of the TPEs. Olefins flexibility remains down to — 5TC (- 60°F), and they are not brittle at 32°C (90°F). They are autoclavable and can be used up to 135°C (275°F) in air. These TPOs have good resistance to some acids and most bases. They are attacked by chlorinated hydrocarbon solvents. Olefin compounds rated V-0 by UL 94 are available. 

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