Potassium thallium bromide

Thallium(III), particularly as the trifluoroacetate salt, is also a reactive electrophilic metallating species, and a variety of synthetic schemes based on arylthallium intermediates have been devised.75 Arylthallium compounds are converted to chlorides or bromides by reaction with the appropriate cupric halide.76 Reaction with potassium iodide gives aryl iodides.77 Fluorides are prepared by successive treatment with potassium fluoride and boron trifluoride.78 Procedures for converting arylthallium compounds to nitriles and phenols have also been described.79... 

In all 28 parameters were individually mapped alkalinity, aluminum, antimony, arsenic, barium, boron, bromide, cadmium, calcium, chloride, chromium, conductivity, copper, fluoride, hardness, iron, lead, magnesium, manganese, nitrate, pH, potassium, selenium, sodium, sulphate, thallium, uranium, and zinc. These parameters constitute the standard inorganic analysis conducted at the DENV Analytical Services Laboratory. 

Fig. 1. Simultaneous separation and detection of anions and cations on a latex agglomerate column. Column Dionex HPIC-CS5 cation exchange column (250X2 mm) with precolumn HPIC-CG5 (50 X 4 mm) eluent 0.5 mM copper sulfate, pH 5. 62 flow rate 0.5 ml/min sample volume 20 gl containing 0.1 m M of each ion detection two potentiomet-ric detectors equipped with different ion-selective electrodes in series. Peaks (1) chloroacetate, (2) chloride, (3) nitrite, (4) benzoate, (5) cyanate, (6) bromide, (7) nitrate, (8) sodium, (9) ammonium, (10) potassium, (11) rubidium, (12) cesium, (13) thallium. Reprinted with permission from [10].

The synthesis of benzyl fluorides from benzyl halides is problematic due to the tendency to undergo Friedel Crafts reactions.The fluorination of benzyl bromide with thallium(l) fluoride gives impure benzyl fluoride and attempts to fluorinate benzyl halides with anti-mony(III) fluoride, silver fluoride, and potassium fluoride were all unsuccessful. Benzyl fluorides with substituents which deactivate the aromatic system towards Friedel-Crafts reactions are successfully obtained through halogen exchange with mercury(II) fluoride (Table... 

If the thallium dipiieiiyl cliloride be replaced by thallium diethyl bromide, only thallous iodide is isolated from the reaction. It has been pointed out that thallium dialkyJ halides when treated with moist silver oxide yield the corresponding hydroxides, and that the latter with acids give salts. In the aromatic series, it is found that the best method of preparing the salts is to boil together a mixture of the halide, silver oxide, and the organic acid in toluene. Alcoholic potassium hydroxide transforms the halides to oxides, and these are also available for production of salts. 

Thallium dimethyl iodide.—This compound is obtained by treating the mother-liquors from the above bromide with potassium iodide, the decomposition temperature of the product being given as 264° to 266° C. It may also be prepared by the action of magnesium methyl iodide on thallic chloride. Obtained in this manner it only shows... 

Thallium diethyl iodide cr stallises from water in white plates when quite pure, and investigators differ regarding its temperature of decomposition. It may he prepared from the corresponding chloride or bromide by the addition of potassium iodide to their aqueous solutions, or by the interaction of thallium diethyl sulphate and barium iodide, also by use of the Grignard reagent. It is difficultly soluble in water, alcohol, or ammonia, but may easily be reerystaliised from pyridine. 

Thallium(I) cyanide was introduced by Taylor and McKillop as a reagent. Aromatic and heteroaromatic acyl cyanides are produced in go yield, whereas aliphatic acid halides lead under these conditions mainly to dimerization products. 18-Crown-6 is a good catalyst for the preparation of cyanoformate in methylene chloride with potassium cyanide and chloroformates. Similarly, tetraethylammonium cyanide gives cyanoformates in high yield under very mild conditions. Aroyl cyanides are generated easily by phase transfer catalysis with tetra-n-butylammonium bromide. Tri- -butyltin cyanide proved successful only with aromatic acid halides, leading to dimerization products with aliphatic compounds. ... 

The reaction of arylthallium(III) compounds (83) with potassium bromide gave the dibromoaryl thallium derivatives (100), which decomposed rapidly either on storage or on gentle heating into aryl... 

Rearrangements Aluminum bromide. Calcium carbonate. Dimethylthiocarbamyl chloride Dimsylsodium. 1,3-Dithiane. Lithium diethylamide. Manganese dioxide. Methyl vinyl ketone, 4a —> 5a. Michler s ketone. Norbornene. Perchloric acid. Pinacol-type see Potassium /-butoxide. Potassium /-butoxide. Silver perchlorate. Thallium triacetate. Triethyloxonium-fluoroborate. 

This thallium compound is prepared in ether or THF solution from potassium t-butoxide and diethylthallium bromide. 

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