355-42-0 Perfluorohexane

Anodic oxidation ui fluorosutfomc acid converts perfluoraalkyl methanols into perfluoroalkyl fluurondfates [4] (equation 42), (o-hydiododecafluorohexyl methanol can be converted to perfluorohexane-1,6-bisfluorosulfate when a higher ratio of Faraday charge per mole is applied 4] (equation 43)... 

Pozzi and co-workers have also reported a fluorous soluble cobalt complex, which is active in the aerobic epoxidation of alkenes in a fluorous biphasic system (FBS).[50] The ligand used in this complex was a fluorinated tetraarylporphyrin, with eight perfluorooctyl chains shown in Figure 6.13. The cobalt complex was dissolved in perfluorohexane and added to a solution of the alkene with 2-methylpropanal (aldehyde substrate — 2 1) at room temperature. 

Based on 25% down time, perfluorohexane as fluorous solvent and P(4-C6H4C6Fi3)3 as the ligand. 

A more recent study of 36 in perfluorohexane lent support to this conclusion.73 Firstly, the experimental barrier to 1,2-H migration in 36 was much smaller than predicted by ab initio calculations (2.56 vs. 7.4 kcal/mol), whereas the measured a for the rearrangement of 36-dg compared well with the computed 5.6 kcal/mol. Secondly, the observed activation parameters revealed large KIEs (E° — ) = 3.18 kcal/mol, and AD/AH = 158. These results support the... 

Reactants and reagents can be conveniently loaded into the dry zeolite by adsorption. This can be accomplished by intimately mixing the solid or liquid reactant and the powdered zeolite, by absorption from the gas phase, or by diffusion in a solvent slurry containing the zeolite and dissolved reactant. The choice of solvent for the slurry method is critical. It must be volatile enough to be removable at a pressure and temperature that does not result in evacuation of the reactant or its decomposition. In addition, the reactant must have a greater affinity for the interior of the zeolite than for the slurry solvent itself. The lack of affinity for the interior of the zeolite is an acute problem for non-polar hydrocarbons that lack binding sites for the intrazeolitic cations. The use of fluorocarbons such as perfluorohexane as slurry solvents takes advantage of the fluorophobicity of many hydrocarbons and has alleviated this problem to some extent.29... 

Micelle formation of our block copolymers in fluorinated solvents indicates that these polymers might act as stabilizers or surfactants in a number of stabilization problems with high technological impact, e.g., the surface between standard polymers and media with very low cohesion energy such as short-chain hydrocarbons (isopentane, butane, propane), fluorinated solvents (hexafluoroben-zene, perfluoro(methylcyclohexane), perfluorohexane) and supercritical C02. As... 

A fluorous analogue of DMSO has been used to perform Swern reactions [24], This widely used method of oxidizing an alcohol to an aldehyde falls down seriously from the environmental point of view due to its production of a stoichiometric amount of dimethyl sulfide. Here, a fluorous sulfoxide is prepared and used in the oxidation of several alcohols in dichloromethane, as shown in Scheme 9.12. After reaction, the sulfide is extracted into perfluorohexane and the system recycled. Unfortunately, extraction from dichloromethane was found to be difficult, but replacing the dichloromethane with toluene leads to a more efficient recovery. 

These results show that the ligand (P(et-Rf8)3) has a very low leaching in perfluorohexane. Several fluorous solvents were tested for their critical solution temperature (CST) with the substrates (Table 5). 

Table 4 Pd-leaching in perfluorohexane with fluorous ligands...

Carbosilane dendrimers with perfluorinated end groups in perfluorohexane were studied by Stark et al. [308]. The significant deviations from simple diffusion that are observed in the NSE data in this case are attributed to shape fluctuations following a procedure that had been developed for the analysis of micro-emulsion droplet fluctuations [309]. 

HBCD hexabromocyclododecane, HCB hexachlorobenzene, p,p -DDT Dieldrin, 1,1,1-trichloro-2,2-bis-(4-chlorophenyl)-ethane, p,p -DDE l,10-dichloro-2,20-bis(4-chlorophenyl) ethylene, p,p -DDD l,10-dichloro-2,20-bis-(4-chlorophenyl)ethane, PFOS perfluorooctane sulfonate, PFHS perfluorohexane sulfonate, PFBS perfluorobutane sulfonate... 

On heating the sulfane mixture [C4F9CF(CF3)2]2Sn (average sulfur chain length n = 2.5) with chlorine fca 125 hr at 106°C, the perfluorohexane-2-sulfenyl chloride is formed in appreciable yield 86, 127). The patent literature (5, 19, 87-89,127) abounds with long-chain sulfenyl chlorides prepared according to this latter procedure, but physical data are lacking. 

M. Gama de Abreu, A.D. Quelhas, P. Spieth, G. Brauer, L. Knels, M. Kasper, A.V. Pino, J.U. Bleyl, M. Hubler, F. Bozza, J. Salluh, E. Kuhlisch, A. Giannella-Neto, T. Koch, Comparative effects of vaporized perfluorohexane and partial liquid ventilation in oleic acid-induced lung injury, Anesthesiology 104 (2006) 278-289. 

Sometimes a two-step process is necessary to match the performance of chlorinated solvents. Marino suggests that using an ester-based propriety solvent in combination with a perfluorohexane rinse in a retrofitted vapor degreaser to replace TCA is a cost-competitive option (Marino, 1993). 

For the achievement of mass balances in intrazeolite photooxygenation reaction, >80%, loading levels of 0.1-0.3 adsorbed molecules per zeolite supercage have been successfully used in the past. However, the recent observation159 by Pace and Clennan, that replacing the solvent hexane with perfluorohexane was very crucial for the efficiency of the reaction, allowed the zeolite medium to be used for preparative scale photooxygenation reactions (500 mg of alkene), without loss of the product selectivity or the reduction of the mass balance. 

Vidal et al. [39] reported plasma modification of CBS with different monomers acrylic acid, acetylene, and perfluorohexane. It was found that by plasma polymerizing appropriate monomers onto the surface of accelerator particles, the onset of its accelerating effect during vulcanization could be controlled. Rheometer testing... 

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