Diethyl 1,1,2,3,3,3 hexafluoro

Phosphinate Diethyl Hexafluoro-4-(trifluoro-etlienyloxy)-propane EI0b2, 153 (-Cl2 -> En)... 

Phosphate Diethyl-(hexafluoro-1-phenyl-1-butenyl)- ElOb,. 453 (Educt)... 

This dialkoxydiphenylsulfurane has been prepared by the reaction of diphenyl sulfide, 2,2,2-trifluoro-l-phenyl-l-(trifluoromethyl)ethyl hypochlorite, and potassium l,l,l,3,3,3-hexafluoro-2-phenyl-2-propanolate and by the reaction of diphenyl sulfide with 1 equivalent of chlorine and 2 equivalents of potassium 1,1,1,3,3,3-hexafluoro-2-phenyl-2-propanolate in diethyl ether. ... 

Potassium cyanide, 56, 20 Potassium diethyl phosphite, 58, 135, 138 Potassium 1,1,1,3,3,3-hexafluoro-2-phenyl-... 

Hexafluoro-2-(4-fluorophenyl)-2-propyl acrylate (la) and hexafluoro-2-(4-fluorophenyl)-2-propyl methacrylate (lb)7 were prepared by gradually adding a solution of 0.06 mol of acryloyl or methacryloyl chloride, respectively, in 20 ml of tetrahydrofuran (THF), to a cooled solution of 0.04 mol of HFAF in 50 ml of THF containing 0.06 mol oftriethylamine. The mixture was stirred for 10-12 h at room temperature it then was poured into 200ml of water, and the new product was extracted with diethyl ether. After the diethyl ether was evaporated, the crude product was purified by column chromatography using a mixture of hexane and dichloromethane (1 1 by volume) as the elution solvent. Distillation afforded la, b.p. 72-74°C/10"3 mm Hg, and lb, b.p. 48-52oC/103 mm Hg. 

Potassium cyanide, 56, 20 Potassium diethyl phosphite, 58, 135, 138 Potassium 1,1,1,3,3,3-hexafluoro-2-phenyl-2 propanolate, 57, 22 Potassium iodide, 55, 71 Potassium permanganate, 55,68,58,47, 52 Potassium p-toluenesulfinate, 57, 8 /-Proline, iV-benzyloxycarbonyl-3-hy-droxy-, 56, 89... 

Fluoropyridinium salts with either tetrafluoroborate, hexafluoroantimonate, or hexafluoro-phosphate as a counteranion can be treated with excess base (triethylamine, pyridine, diethyl-amine) at room temperature to give 2-fluoropyridine (bp 125 126°C, d4° 1.131, np° 1.468) in good yield.43 This method has been successfully applied to the preparation of 2-fluoropyridine derivatives 4 possessing electron-donating or -withdrawing substituents using substituted 1-fluoropyridinium tetrafluoroborates.43... 

Phospbinieoate Diethyl 3-(l,2-Dichloro-triliuoro-cthoxy)-hexafluoro-prnpane EI0b2. 153 (Educt)... 

C9H,0C12E 904P Phosphonate Diethyl 3-( 1.2-Dichloro-tri lluoro-ethoxy)-hexafluoro-propiine EI0b2. 127 (1 POX2)... 

Abbreviations BOP, benzotriazol-l-yloxy-tris(dunethylamino)phosphonium hexafluoro-phosphate DCC, N.N -dicyclohexylcarbodiimide DIC, /V./V -diisopropylcarbodiimide DME, dimethoxyethane DMF, /V./V-dimethyl form amide DIEA, /V-cthyldiisopropyla-mine Et20, diethyl ether HOBt, 1-hydroxybenzotriazole HOSu, iV-hydroxysuccimmide t-BuOMe, tert-butylmethylether TFA, trifluoroacetic acid TIS, triisopropylsilane. 

The salt is easily converted to the water-insoluble hexafluoro-phosphate. A filtered solution of 0.766 g. of the crude salt in 15 ml. of water is precipitated by slowly adding excess saturated aqueous ammonium hexafluorophosphate while the solution is stirred. The filtered solid is washed (50 ml. of water) until free of bromide ion and then washed with 30 ml. of anhydrous diethyl ether. Yield of the dried product is 0.973 g. (96%), m.p. 248-250°C. Recrystallization by letting a warm solution (20 ml. of 1 1 water-acetone) evaporate slowly gives no change in melting point. 

The adduct obtained from acetaldehyde and perfluoro-3,4-dimethylhex-3-ene on y-irradiation was transformed thermally into a fluoroalkylated furan in the presence of tributylamine (80TL1891). 4,5-Bis(trifluoro-methyl)octa-3,6-dione, the addition product of propionaldehyde to hexafluoro-2-butyne on y-irradiation, yields 2,5-diethyl-3,4-bis-(trifluoromethyl)furan on treatment with sulfuric acid (91JHC225) (Scheme 51). 

The direct determination of SA values for more acidic solvents was not possible because in such solvents the indicator dyes (52) and (53) are protonated at the carbonyl oxygen atom. For such acidic solvents, 3,6-diethyl-l,2,4,5-tetrazine (DETZ) was introduced as a third probe dye [337b]. This aromatic tetrazine exhibits a solvent-dependent n n absorption in the visible region a change from methylcyclohexane = 550 nm) to hexafluoro-2-propanol (Imax = 517 nm) leads to a hypsochromic band shift of A2 = —33 nm (Av = +1160 cm ), mainly due to the HBD acidity of the... 

Epoxides with a latent leaving group on the ring are used as bifunctional two-carbon synthons in the heterocyclization procedure. Thus, reactive hexafluoro-1,2-epoxypropane reacts with benzene-1,2-diamine in diethyl ether or tetrahydrofuran in the presence of sodium hydrogen carbonate or potassium carbonate to afford 3-(trifluoromethyl)quinoxalin-2(l//)-one. ... 

The structure of the 2,4,4-tris(trifluoromethyl)-4//-l,3,5-oxadiazine formed by condensation of 0,0-diethyl-l-(2-cyanoguanidino)-l-methylpropyl phosphonate with 2-(acylimino)hexafluoro-propanone has been assigned unequivocally on the basis of an x-ray crystal structure of the trifluoroacetyl derivative (27) <88DOK(302)107>. A crystal structure of the related diazaphospholidene derivative (28) reveals that the 1,3,5-oxadiazine ring adopts a markedly flattened chair conformation with O, and C4 at 3.8° and —4.5°, respectively, out of the plane formed by C2—N3—N5—Ce... 

Most of the liquid electrolytes used in the commercial lithium-ion cells are the nonaqueous solutions, in which roughly 1 mol (tar (= M) of lithium hexafluoro-phosphate (LiPF ) salt is dissolved in the mixture of carbonate solvents selected from cyclic carbonates - ethylene carbonate (EC), and propylene carbonate (PC) and linear carbonates - dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) -, whose chemical structures are displayed in Fig. 4.2. Recently, another type of liquid electrolyte based on 1.5 M LiBFyy-butyrolactone (GBL) + EC came onto the market for the laminated thin Uthium-ion ceUs with an excellent safety performance. Many other solvents and Uthium salts have limited appUcations, although much effort has been made to develop new materials. Into the above baseline electrolyte solutions, a small amount of the additives are dissolved, which are so-called functional electrolytes. ... 

To date, several polymer hosts have been used in GPEs that include PEG, PPO, PAN, PMMA, poly(vinyl chloride) (PVC), PVdF, poly(vinylidene fluoride-hexafluoro propylene) (PVdF-HFP), etc. Furthermore, the Bellcore method and phase inversion method have been developed for the preparation of GPEs. The Bellcore process is critical and developed from the fabrication of PVdF-HFP copolymers. It involves the plasticization of PVdF-HFP copolymers, subsequent plasticizer removal, and the final reswelling in an electrolyte solution. Low-boiling solvents, such as diethyl ether or methanol, are successfully employed to remove dibutyl phthalate (DBF) from the polymer matrix, leaving a pore structure in the polymer layers which is then refilled with the liquid electrolyte during the cell activation process (Song et af, 1999). 

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