Bromine salts

Bromides of sodium, potassium, magnesium and calcium occur in sea water (about 0.07 % bromine) but the Dead Sea contains much more (5% bromine). Salt deposits (e.g. at Stassfurt) also contain these bromides. Silver bromide, AgBr, is found in South America. 

The first indication that molecular compounds could exhibit interesting electrical properties apart from those of an insulator was given in 1954, when Akamatu et al. (1) reported a resistivity of p = 10 2 cm for a bromine salt of perylene. Normally perylene crystals themselves are insulating with p = 1014 1016 1 cm therefore, a dramatic change in electronic structure had occurred. The perylene molecule is shown in Fig. 1. 

Derivation From seawater and natural brines by oxidation of bromine salts with chlorine solar evaporation (Great Salt Lake) from salt beds at Stassfurt and the Dead Sea. 

The structure of 5,6-diseleno-ll,12-ditellurotetracene, DSeDTeT (2) has been determined for the bromine salt (DSeDTeT)2Br <86MI 313-oi>. 

Bromine Liquid Hydrolysis of compounds like halogenated hydantoins Displacement from a bromine salt water by chlorine... 

It should be noted that the employment of filter paper often results in indistinct prints. It is advisable to use glossy photographic paper from which the bromine salts have been previously removed. 

For ionized solvents which do not contain protons a base is a substance which reacts with the acid of that system to give a salt and the solvent. Thus the base KBrp4 reacts with the acid BrFiSbFfi to give the salt KSbF and Brp3 in bromine trifluoride. 

The diazonium salts usually decompose when warmed with water to give a phenol and nitrogen. When treated with CuCl, CuBr, KI, the diazo group is replaced by chlorine, bromine or iodine respectively (Sandmeyer reaction). A diazonium sulphate and hydroxyl-amine give an azoimide. The diazonium salt of anthranilic acid (2-aminobenzoic acid) decomposes to give benzyne. ... 

Copper 1) chloride, bromide and cyanide were used by Sandmeyer to introduce a chlorine, a bromine atom and a cyanide group respectively into a benzene ring by addition to the phenyl diazonium salt. 

Dissolve the solid in 700 ml. of water in a 1500 ml. round-bottomed flask, and add a solution of 88 ml. of concentrated sulphuric acid in about 200 ml. of water until the liquid has a distinct odour of sulphur dioxide sufficient heat will be liberated in the neutralisation to cause the solution to boil. Immediately steam distil the liquid (Fig. II, 40, 1 it is better to use the apparatus shown in Fig. II, 41, 3) until a sample of the distillate gives only a slight precipitate with bromine water. About 700 ml. of distillate should be collected. Saturate the steam distillate with salt, extract the dl with ether, dry the extract with a little anhydrous magnesium or calcium sulphate, distil oflF the ether (compare Fig. II, 13, 4, but with a 50 ml. Claisen flask replacing the distilling flask) and distil the residue under diminished pressure. Collect the p-cresol at 95-96°/15 mm. the colourless liquid solidifies to a white crystalline solid, m.p. 31°. The yield is 24 g. 

Synthesis of (A) started with the combination of 2,4,6-trimethylphenol and allyl bromide to give the or/Ao-allyl dienone. Acid-catalyzed rearrangement and oxidative bydroboration yielded the dienone with a propanol group in porlactone ring were irons in the product as expected (see p. 275). Treatment with aqueous potassium hydroxide gave the epoxy acid, which formed a crystalline salt with (R)-l-(or-naphthyl)ethylamine. This was recrystallized to constant rotation. 

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