PREPARATIONS 107 Fit the flask with a 100° thermometer and a water-condenser, and distil the ethyl iodide carefully from a water-bath, collecting the fraction which distils between 68° and 73°. Yield, about 24 g. Ethyl iodide is a heavy liquid, of b.p. 72° and of d , 1-94; in-soluble in water. When freshly distilled it is colourless, but on prolonged exposure to light it darkens in colour owing to the liberation of free iodine. Its chemical properties are almost identical with those of ethyl bromide given on pp. 102 and 103. Acetylation. Compounds of the type ROH (alcohols and phenols), and also compounds of the type RNH 2 and R 2 NH (primary and secondary amines) can be directly acetylated, the reactive H atom being replaced by the acetyl radical,-COCH 3 . The acetylation of alcohols and phenols is really a special case of esterification, since the acetyl derivative, ROCOCH 3 , is clearly an ester of acetic acid. Primary and secondary amines similarly give acetyl derivatives of the type RNHCOCH
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