Organothallium compounds. XVIII. The effect of antimony pentafluoride and fluorosulfuric acid on the thallation of polyfluoroarenes

1982 ◽  
Vol 35 (8) ◽  
pp. 1587 ◽  
Author(s):  
GB Deacon ◽  
RNM Smith
Keyword(s):  
Boron Trifluoride ◽  
Sodium Iodide ◽  
Boron Trifluoride Etherate ◽  
Antimony Pentafluoride ◽  
Aqueous Sodium ◽  
Organothallium Compounds

The polyfluoroarenes m-H2C6F4, m-O2NC6F4H, m- and p-BrC6F4H, (p-HC6F4)2, C6F5H, 1,3,5-F3C6H3 and m-FSO2C6F4H have been thallated by thallic trifluoroacetate in fluorosulfuric acid in the presence of antimony pentafluoride. Substantial dithallation of m-H2F4 and 1,3,5-F3C6H3 and slight trithallation of the latter have been achieved. The products were identified by conversion into the corresponding polyfluoroiodoarenes on reaction with aqueous sodium iodide. From the reaction with pentafluorobenzene, pentafluorophenylthallium(III) species have been characterized. 1,2,4,5-Tetrafluoro-3-methoxybenzene was thallated by thallic trifluoroacetate in 1,2-dichloroethane in the presence of boron trifluoride etherate, but C6F5H and p-MeC6F4H failed to react.

scholarly journals New System of Deprotection Step for the Hydroxide Radicals: Boron Trifluoride Etherate/Sodium Iodide

2011 ◽  
Vol 3 (3) ◽  
Author(s):  
Yuqing Cao ◽  
Xiaojun Yang ◽  
Dingxiang Du ◽  
Xiangtao Xu ◽  
Fangrui Song ◽  
...  
Keyword(s):  
Boron Trifluoride ◽  
Sodium Iodide ◽  
Boron Trifluoride Etherate ◽  
Hydroxide Radicals ◽  
New System

Organothallium Compounds. XV. Thallation of Polyfluoroaromatic Compounds

1979 ◽  
Vol 32 (4) ◽  
pp. 737 ◽  
Author(s):  
GB Deacon ◽  
D Tunaley
Keyword(s):  
Trifluoroacetic Acid ◽  
Sodium Acetate ◽  
Room Temperature ◽  
Sodium Iodide ◽  
Trifluoromethanesulfonic Acid ◽  
Boiling Water ◽  
Similar Reaction ◽  
Aqueous Sodium ◽  
Organothallium Compounds

Thallic trifluoromethanesulfonate has been prepared by reaction of trifluoromethanesulfonic acid with either thallic oxide or solutions of thallic trifluoroacetate in trifluoroacetic acid, and has been isolated as the trihydrate on crystallization fromnitromethane. The polyfluoroarenes,p-CH3OC6F4H, p-CH3C6F4H, m-H2C6F4, o-H2C6F4, p-H2C6F4, C6F5H, 1,3,5-F3C6H3 or 1,2,4-F3C6H3, have been thallated by thallic trifluoromethanesulfonate in trifluoroacetic acid, giving the corresponding poly- fluorophenylthallium(III) bis(trifluoromethanesulfonates), which have been characterized spectroscopically and by conversion into the corresponding (polyfluoro)iodobenzenes on treatment with sodium iodide. Only slight thallation of m-BrC6F4H and m-O2NC6F4H was observed. By contrast with thallic trifluoromethanesulfonate, thallic trifluoroacetate in trifluoroacetic acid induced little thallation of the most reactive polyfluorobenzene, p-CH3OC6F4H. Thallic trifluoromethanesulfonate also thallated p-CH3OC6F4H in nitromethane, sulfolane, and with the substrate as solvent, but p-CH3C6F4H failed to react. Treatment of the polyfluorophenylthallium(III) bis(trifluoromethane- sulfonates) with boiling aqueous sodium acetate caused symmetrization into the corresponding acetatobis(polyfluorophenyl)thallium(III) compounds. A similar reaction between 2,4,6-trifluoro- phenylthallium(III) bis(trifluoromethanesulfonate) and sodium acetate at room temperature yielded 2,4,6-trifluorophenylthallium(III) diacetate. 2,3,4,6-Tetrafluorophenylthallium(III) bis(trifluor0- methanesulfonate) was converted by boiling water into bis(2,3,4,6-tetrafluorophenyl)thallium(III) trifluoromethanesulfonate.

Synthesis of o-isopentenylphenols

1971 ◽  
Vol 24 (11) ◽  
pp. 2355 ◽  
Author(s):  
J Hlubucek ◽  
E Ritchie ◽  
WC Taylor
Keyword(s):  
Phosphoric Acid ◽  
Zinc Chloride ◽  
Boron Trifluoride ◽  
Boron Trifluoride Etherate ◽  
Stannic Chloride ◽  
Counter Ion

The effect of the solvent and the counter-ion on the ring alkylation of 3- and 4-methoxyphenols by isopentenyl bromide has been examined. Under strictly anhydrous conditions good and consistent yields of the o- isopentenylphenols were obtained with the combination potassium- toluene, but sodium-toluene was more convenient. ��� Boron trifluoride etherate was more satisfactory than stannic chloride, zinc chloride, or phosphoric acid in catalysing the condensation of 3- and 4-methoxy-phenols with 2-methylbut-3-en-2-ol to the corresponding o-isopentenylphenols. Aryl α,α-dimethylpropargyl ethers were partially hydrogenated to the corresponding α,α- dimethylallyl ethers which rearranged in boiling N,N-diethyl-aniline to o-isopentenylphenols in high overall yield.

scholarly journals Synthesis of 5,6,7,8-Tetrahydroquinolines by Thermolysis of Oxime O-Allyl Ethers in the Presence of Boron Trifluoride Etherate.

1993 ◽  
Vol 41 (7) ◽  
pp. 1297-1298 ◽  
Author(s):  
Junko KOYAMA ◽  
Tamaki OGURA ◽  
Kiyoshi TAGAHARA ◽  
Masaaki MIYASHITA ◽  
Hiroshi IRIE
Keyword(s):  
Boron Trifluoride ◽  
Boron Trifluoride Etherate ◽  
Allyl Ethers
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