1,1,2,2-Tetrafluoro-3-

FEP plastics Copolymers of tetrafluoro-ethene and hexafluoropropene. Inert and corrosion resistant as Teflon but can be processed by melt techniques. 

Question. List the symmetry elements of each of the following molecules (a) 1,2,3-trifluorobenzene, (b) 1,2,4-trifluorobenzene, (c) 1,3,5-trifluorobenzene, (d) 1,2,4,5-tetrafluoro-benzene, (e) hexafluorobenzene, (f) l,4-dibromo-2,5-difluorobenzene. 

Nucleophilic Reactions. The strong electronegativity of fluorine results in the facile reaction of perfluoroepoxides with nucleophiles. These reactions comprise the majority of the reported reactions of this class of compounds. Nucleophilic attack on the epoxide ring takes place at the more highly substituted carbon atom to give ring-opened products. Fluorinated alkoxides are intermediates in these reactions and are in equiUbrium with fluoride ion and a perfluorocarbonyl compound. The process is illustrated by the reaction of methanol and HFPO to form methyl 2,3,3,3-tetrafluoro-2-methoxypropanoate (eq. 4). 

In the iavestigation of the decomposition reaction of aryldia2onium tetrafluoroborates ia nitroben2ene, it was found that ia addition to uoroben2ene, 3,3 -dinitrobiphenyl was formed (67). An ionic type of arylation reaction seems to take place. Decomposition of aryldia2onium tetrafluoro-, tetrachloro-, and tetrabromoborates ia aromatic solvents leads to electrophilic ring arylation (68). 

In one example where a 2-Cl and 2 -F were present, only the chloride displacement product (548) was reported also the tetrafluoro-l,2-benzisoxazole (550) was prepared by heating the oxime (549) (Scheme 166) (79EUP2666, 71MI41600). 

Benzo[b]furan-3-carboxylic acid, 4,5,6,7-tetrafluoro-2-methyl-, ethyl ester C NMR, 4, 568 <72JCS(P2)1733> Benzo[b]furan-3-carboxylic acid, 4,5,7-trifluoro-2-methyl-, ethyl ester C NMR, 4. 568 <72JCS(P2)1733>... 

Benzo[i]thiophene, 4,5,6,7-tetrafluoro-electrophilic substitution, 4, 797 synthesis, 4, 895, 932... 

Diazetidinones carbonyl derivatives nucleophilic reactions, 7, 462 A -1,2-Diazetine, c/s-3,4-diethyl-3,4-dimethyl-decomposition, 7, 456-457, 483 A -1,2-Diazetine, tetrafluoro-thermolysis, 7, 456 A -l,2-Diazetine, tetramethyl-thermolysis, 7, 456 A -1,2-Diazetine, 3,3,4,4-tetramethyl-properties, 7, 483... 

Pyridazine, perfluoro-3,5-diisopropyl-photolysis, 7, 283 Pyridazine, tetrachloro-nucleophilic substitution, 3, 26 Pyridazine, tetrafluoro-nucleophilic substitution, 3, 26 Pyridazine, tetrahydro-, 3, 39-Uo Pyridazine, 3,4,5,6-tetrahydro-... 

Pyrimidine, 2,4,5,6-tetrachIoro-dyes from, 1, 321 Pyrimidine, tetraSuoro- F NMR, 3, 63 Pyrimidine, 2,4,5,6-tetrafluoro- F NMR, 3, 63 Pyrimidine, tetrahydro-acetonin synthesis, 3, 118 polymers, 1, 314 Principal Synthesis, 3, 115 Pyrimidine, 1,4,5,6-tetrafaydro-... 

Thiirane, 2-phenyl-conformation rotational barriers, 7, 138 polymerization, 7, 144 Thiirane, tetraaryl-synthesis, 7, 175 Thiirane, tetrafluoro-halogenation, 7, 148 polymerization, 7, 144 reactions... 

Iron pentacarbonyl and l-methoxy-l,4-cyclohexadiene react as shown by Birch and oo-workera, but in dibutyl ether this solvent has been found superior. The tricarbonyl(methoxy-l,3-cyclohexadiene)iron isomers undergo hydride abstraction with triphenylmethyl tetrafluoro-borate to form the dienyl salt mixture of which the 1-methoxy isomer is hydrolyzed by water to the cyclohexadienone complex. The 2-methoxy isomer can be recovered by precipitation as the hexafluoro-phosphate salt. By this method the 3-methyl-substituted dienone complex has also been prepared from l-methoxy-3-methylbenzene. The use of the conjugated 1-methoxy-1,3-cyclohexadiene in Part B led to no increase in yield or rate and resulted chiefly in another product of higher molecular weight. An alternative procedure for the dienone is to react tricarbonyl(l,4-dimethoxycyclohexadiene)iron with sulfuric acid. ... 

C2F4 TETRAFLUORO- -656.653 1.1776E-01 -1.8295E-06 -623.71 89 C3H4 ALLENE(PROPA- 191.839 3.0752E-02 1.4194E-05 202.38... 

The inability to process PTFE by conventional thermoplastics techniques has nevertheless led to an extensive search for a melt-processable polymer but with similar chemical, electrical, non-stick and low-friction properties. This has resulted in several useful materials being marketed, including tetrafluoro-ethylene-hexafluoropropylene copolymer, poly(vinylidene fluoride) (Figure 13.1(d)), and, most promisingly, the copolymer of tetrafluoroethylene and perfluoropropyl vinyl ether. Other fluorine-containing plastics include poly(vinyl fluoride) and polymers and copolymers based on CTFE. 

Steric factors would ordinarily be expected to induce a preference for the larger group to move outward and thus generate the -isomer. It was observed, however, that in the case of l,2,3,4-tetrafluoro-tran5-3,4-bis(trifluoromethyl)cyclobutene, ring opening occurred with an inward rotation of the trifluoromethyl groups. ... 

Tetrafluoro- Medium 2.3 0 500 Good Good Good Expensive... 

A related reaction allows l,l,3,3-tetrafluoro-l,3-dihydroisobenzofuran to be prepared from 2-trichloromethy Ibenzoyl chloride and anhydrous hydrogen fluoride [35] (equation 26)... 

Treatment ot I,l,3,3-tetrafluoro-l,3-dihydroisobenzofuran with anhydrous hydrogen fluoride, followed by hydrolysis of the intermediate acid fluoride, gives a high yield of 2-trifluoromethylbenzoic acid [4] (equation 4). 

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