3.3.3- Trifluoropropyl carbonate

Methyl propyl carbonate (MPC) is a structural isomer of DEC. Physical and electrochemical properties of four kinds of partially fluorinated MPC derivatives, 3-fluoro-propyl methyl carbonate (EPMC), methyl 3,3,3-trifluoropropyl carbonate (TrEPMC), methyl 2,2,3,3-tetrafluoropropyl carbonate (TeEPMC), and methyl 2,2,3,3,3-pentaflu-oropropyl carbonate (PeEPMC) in Schane 2.8 were examined [42]. 

The original and by far the most widely available fluorosilicone since its introduction in the 1950s is polymethyltrifluoropropylsiloxane (PMTFPS), more rigorously known as poly[methyl(3,3,3-trifluoropropyl)siloxane] or poly[methyl(lH,lH, 2H,2H-trifluoropropyl)siloxane]. Unless specifically mentioned, the unfluorinated carbons are those nearest to silicon, i.e., poly(methylnon-afluorohexyl)siloxane (PMNFHS) is poly[methyl(lH,lH,2H,2H-nonafluoro-hexyl)siloxane]. Currently, only copolymers of PMTFPS and PMNFHS with poly siloxane (PDMS) are available commercially.79... 

Finally, by the chlorination of tris(y-trifluoropropyl)silane with gaseous chlorine in the carbon tetrachloride medium, we obtain tris(y-trifluoropropyl) chlorosilane ... 

The chlorination of tris(y-trifluoropropyl)silane is achieved in the carbon tetrachloride medium. First, carbon tetrachloride from batch box 29 and tris(y-trifluoropropyl)silane from receptacle 27 self-flow into chlorinator 28. Gaseous chlorine passes through a receiver and a glass cotton filter (not shown on the diagram) and is also fed into the chlorinator. The process is conducted at atmospheric pressure and at the temperature of 23-26 °C, which is supported by water sent into the apparatus jacket. Above the chlorinator there is backflow cooler 30 cooled by Freon. The... 

As soon as it is accumulated, the concentrate is sent back to the tower tank then the tank is connected to the vacuum line to distil the intermediate distillate, a mixture of carbon tetrachloride, unreacted tris(y-trifluoropropyl)silane and chlorination by-products. The distillation is conducted at 160-170°C in the tank and at 80 °C and a residual pressure of... 

Arai, J. Katayama, H. Akahoshi, H., Binary mixed solvent electrdytes cmtaining trifluoropropyl-ene carbonate for Uthium secondary batteries, J Electrochem. Soc., 2002,149 (2), A217-A226. 

A similar tendency followed from the qualitative comparison of activities of 1,3-DSCBs with such electron-acceptor substituents as y-trifluoropropyl [35, 66]. This trend can be rationalized by different distributions of electron density in MSCB and DSCB molecules. In the case of the MSCB skeleton, the electron-accepting effect of a substituent causes a reduction in electron density on a-carbon atoms of the cycle, thereby making cyclic Si-C-bonds stronger. At the same time, in the case of DSCB, the electron-accepting effect decreases electron density on the endocyclic Si-C- bonds located near electron-acceptor substituent and the far-off Si-C bonds are weakened because of this effect. 

Tacticity studies have been conducted on poly(3-methyl-l-butene) [120], poly(p-isopropyl-a-methyl styrene) [121], a-methyl styrene [122], polytetrafluoroethylene [123], polyacrylic acid [124], polymethylvinyl ethers [125], polyacrylonitrile [126, 127], polyvinyltrifluoro acetate [128], polyvinyl alcohol and its ethers [129, 130], isobutene-maleic anhydride [111], isobutene dimethyl fumerate [131], isobutene dimethyl maleate [131], polyacrylonitrile [127], ethylene - vinyl acetate [132-135], polyalkyl vinyl ethers [136, 137], ethyl-2-chloroacetate [133], poly-trans-1,3-pentadiene [138], isotactic-l-butene - propylene [139], butadiene - propylene [140], polybutene [141], polychloroprene [142], ethylene - vinyl chloride [143], chlorinated polyethylene [144, 145], poly-a-methyl styrene [146], styrene acrylic acid [147], a-methyl styrene - methacylonitrile [148], styrene acrylonitrile [149], styrene isobutene [150], poly(p-fluoro-a-methyl styrene) [151], polyarylamide-6 [152], PP - polyamide-6 [152], polystyrene oxide [153], polybutene [154], atraconic anhydride - p-chlorostyrene [155], styrene - maleic anhydride [156, 157], ethylene - vinyl acetate [158], polymethyl vinyl ether [159], propene - carbon monoxide [160], methyl(3,3,3-trifluoropropyl)siloxane [161], poly(diallyldimethyl ammonium chloride) [162], polypropene [163, 164], polyepichlorohydrin [165], maleic anhydride-p-chlorostyrene [166], polymethacrylonitrile [167] and polyvinyl acetate [168]. 

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