Ethyl iodide reaction with silver cyanide

ETHYmEXANONITRILE, 32, 65 Ethylidene bromide, 32, 55 Ethyl iodide, 31, 34 reaction with silver cyanide, 35, 63 reaction with silver formanilide, 35, 66... 

Ethylenesulfonyl chloride, 2-phenyl-, 34, 85 Ethylenimine, 30, 38 toxic properties of, 30, 40 Ethyl o-ethoxybenzoa te, 32, 75 Ethyl formate, 32, 32 Ethyl glycidyl ether, 31, 3 Ethyl glyoxylate, 35, 19 2-Ethylhexanaldoxime, 32, 67 2-Ethylhexanamide, 32, 65 2-Ethylhexanoic acid, 32, 66 2-Ethylhexanonitrile, 32, 65 Ethylidene bromide, 32, 55 Ethyl iodide, 31, 34 reaction with silver cyanide, 35, 63 reaction with silver formanilide, 35, 66... 

Aromatic isocyanides can also be prepared conveniently by the dehydration of the corresponding formamides by phosphorus oxychloride, but much better results are obtained if the reaction is done in the presence of potassium fer/-butoxide rather than pyridine.6 Neither method of dehydrating formamides has yet been used to prepare methyl or ethyl isocyanide because their low boiling points make them difficult to isolate from the reaction mixture hence, until a suitable dehydration procedure is worked out, they are best made by reaction of the corresponding alkyl iodide with silver cyanide. ... 

The reaction is a sensitive one, but is subject to a number of interferences. The solution must be free from large amounts of lead, thallium (I), copper, tin, arsenic, antimony, gold, silver, platinum, and palladium, and from elements in sufficient quantity to colour the solution, e.g. nickel. Metals giving insoluble iodides must be absent, or present in amounts not yielding a precipitate. Substances which liberate iodine from potassium iodide interfere, for example iron(III) the latter should be reduced with sulphurous acid and the excess of gas boiled off, or by a 30 per cent solution of hypophosphorous acid. Chloride ion reduces the intensity of the bismuth colour. Separation of bismuth from copper can be effected by extraction of the bismuth as dithizonate by treatment in ammoniacal potassium cyanide solution with a 0.1 per cent solution of dithizone in chloroform if lead is present, shaking of the chloroform solution of lead and bismuth dithizonates with a buffer solution of pH 3.4 results in the lead alone passing into the aqueous phase. The bismuth complex is soluble in a pentan-l-ol-ethyl acetate mixture, and this fact can be utilised for the determination in the presence of coloured ions, such as nickel, cobalt, chromium, and uranium. 

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