4-methoxy-2,2,2,2-tetrafluoro

Phosphane (1.2-Difluoro-elhenyl)-methoxy-( tetrafluoro-1 H-ethyl)-EI0b2, 153 (— F2 - En PH - P-OR)... [Pg.615]

Diphenylphosphano-l-methoxy-tetrafluoro- E10b2. 402 (F - OR) Diphenylphosphano-pcntafluoro-... [Pg.778]

Ethenyl-l-hydroxamino-Letrafluo-ro- E16a/1. 5f. (F -> NH-OH) 4-Ethenyl-1 -methoxy-tetrafluoro-ElObj, 398f. (F - OR) Ethenyl-pentafluoro- E10b2. 7/3981. (Educt)... [Pg.778]

Diphenyl-methoxy- (tetrafluoro-borat) Ell, 369 (O-Alkylier.) (4-Hydroxy-phenyl)-methyl-phenyl-(pikrat) Ell, 470 (R2SO + ArH)... [Pg.1134]

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. ... [Pg.112]

The relative rates of cycloaddition of 88b-88e were measured in comparison with that of the parent 88a as a reference. The methoxy substituent has practically no effect on the reaction rate. However, it is apparent that electron-withdrawing substituents (88b, 88c and 88e) significantly accelerate the anti-addition, whereas in xyn-addition the acceleration is not as large the rate is comparable to that of the reference compound (88a). In the reactions of the tetrafluoro-substituted dienophile 88d, we found significant rate acceleration on both sides, though anti-side addition was still substantially favored. [Pg.165]

Since, in the case of the tm-butyltriptycene skeleton, the maximum barrier to rotation is realized when the substituent in the peri position is medium sized, it was of interest to see whether a similar result would be obtained with other tertiary alkyl groups. Thus to complete the series, 1,2,3,4-tetrafluoro- and l,4-dimethoxy-9-(l-cyano-l-methylethyl)triptycenes (103, X = Y = F or X = CH30, Y = H) were prepared. The fine energies of activation for rotation of the fluoro and the methoxy compounds were 39.9 and 38.9 kcal/mol, respectively, at 462 K (152). It may be too early to draw a general conclusion in the tertiary alkyl series, but it is tempting to consider that the highest barriers are obtained when the peri substituent in this series is fluorine. [Pg.61]

Pyrrolidino- bzw. 3-Piperidino-acrylsaure-ester cyclisieren mit Phenyldiazonium-tetrafluoro-borat unter Einbau eines N-Atoms aus dem Diazonium-Salz zu 2-Methoxy carbonyl-6,7-di-hydro-5 H-yrrolo[l, 2-d imidazol ) (40%) bzw. 2-Methoxycarbonyl-5,6,7,8-tetrahydro-[Pg.59]

Perfluoro(ethylbenzene) reacts with sodium methoxide to afford 1,2,4,5-tetrafluoro-3-methoxy-6-(pentafluoroethyl)benzene (21).95... [Pg.398]

Pentafluorophenyl)ethene reacts with sodium methoxide to give (tetrafluoro-4-methoxy-phenyl)ethene (22).96... [Pg.398]

The reaction of sodium methoxide with pentafluoro(methyl)benzene occurs mainly in the para position relative to the methyl group to give tetrafluoro-3-methoxy-6-methylbenzene (23).97... [Pg.399]

Sodium methoxide when treated with pentafluoronitrosobenzene reacts to give tetrafluoro-3-methoxy-6-nitrosobenzene (25).99... [Pg.399]

Pentafluoronitrobenzene (26) with sodium methoxide produces a mixture of tetrafluoro-5-methoxy-6-nitrobenzene (27) and tetrafluoro-3-methoxy-6-nitrobenzene (28).100101... [Pg.399]

When l,2,3,4-tetrafluoro-9,10-anthraquinone reacts with sodium methoxide, the methoxy group replaces the fluorine atom mainly in the 2-position to give 1,2,4-trifluoro-3-methoxy-9,10-anthraquinone (47). 14... [Pg.403]

Periluoroquinoxaline (23) reacts with sodium methoxide to give pentafluoro-3-methoxy-quinoxaline, tetrafluoro-2,3-dimethoxyquinoxalinc. and trifluoro-2,3,7-trimethoxyquinoxa-line.131... [Pg.409]

Propane I 2-Dichlmo-2-(4-methoxy-phcnyl)-tetrafluoro E 0b2. 144 (Educt)... [Pg.672]

Propanamide N,N-Diethyl 2-(a-Hydroxy-4-methoxy-benzyl)-tetrafluoro- ElOb, 455 (Ar — CHO 4-F3C -CHF CO - NR2)... [Pg.714]

E10b2, 396 (F -> OR) 5-lodo-3-methoxy-1,2,4-lrifluoro-E10b2, 396 (F - OR) lodo-methylthio-tetrafluoro- ElOb,. 616 (F -> SCHj)... [Pg.782]

F - OR). 402 (Educt) 4-Mcthoxy-l-nitio-tetrafluoro-E10b2, 399 f. (F -> OR) 4-Methoxy-l-(4-OXO-5.S, 5-trifluoro-pcntyl)- ElOb, 459 (RF-COOR + -CH2-R)... [Pg.782]

Acctoxy-( tetrafluoro-1 H-cyclopropyl)-inethylene]-3-methoxy-E10b2. 104 (EducL)... [Pg.850]

The reaction of trans-dimethoxy tellurium tetrafluoride with pyridine produced pyridinium /ra .v-(methoxy)oxo(tetrafluoro)tell urate (VI). The tetramethylammonium salt was obtained, when trans-dimethoxy tellurium tetrafluoride was reacted with trimethylamine in dichloromethane2. Treatment of these salts with 96% sulfuric acid gave trans-hydroxy methoxy tellurium tetrafluoride. ... [Pg.129]

Imidazolinium pentafluoro(oxo)tellurate(VI), methanol, and excess imidazole gave imidazolinium d.v-methoxo(tetrafluoro)oxotellurate (VI), which was converted to cis-hydroxy methoxy tellurium tetrafluoride on treatment with 96% sulfuric acid1. [Pg.129]

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