Phosphorus iodids

It is however more complicated, esters of phosphorous acid being also formed (c/. p. 308). Iodides are usually prepared by a modification of this method, the ethanol being mixed with red phosphorus, and iodine added. The phosphorus iodide is thus formed in situ, and at once reacts with ethanol to give the corres ponding iodide. 

A further example is that of isopiopyl iodide see Prep. 31, p. iio, in which the hydriodlc acid is obtained by the action of w.itei on phosphorus iodide,... 

Isopropyl Iodide.—The replacement of hydroxyl by iodine in the action of phosphorus and iodine on alcohols has alieady been described (see Piep. 6, p. 68), but here the presence of an excess of hydriodic acid, which is due to the action of water on the phosphorus iodide,... 

Kudryavtseva, L.I., Alkylation of phosphorus iodides. V. Preparative method for dialkylphosphinic acids, Zh. Obshch. Khim., 60, 833, 1990. 

Preparation of Phosphorus Iodide Pgl. To prepare phosphorus iodide, one must have thoroughly dried carbon disulphide (see Preparation of Phosphonium Iodide ) and purified white phosphorus (see Preparation of Phosphorus Tribromide ). (Perform the experiment in a fume cupboard . ... 

Cool the small amount of the phosphorus iodide solution remaining in the flask with ice. Separate the precipitated crystals using a filter No. 2 in a stream of an inert gas (see Fig. 645) and wash them with dry carbon tetrachloride. Put the crystals into a weighed weighing bottle. Calculate the yield in per cent. 

Carhon monoxide and hydrogen react to form CH in the presence of a nickel catalyst. Methane also is formed by reaction of magnesium methyl iodide in anhydrous ether (Grignard s rcagentl with substances containing the hydroxyl group. See also Grignard Reactions. Methyl iodide (bromide, chloride) is preferably made by reaction of methyl alcohol and phosphorus iodide (bromide, chloride)... 

Phosphorus. Mixture reacts with incandescence forming phosphorus iodide.2... 

Phosphorus iodide, Pali, mixture of, with phosphorus, 2 143 Phosphorus (III) methoxychloro-fluoride, 4 141... 

CnH2314CH2125I has been prepared429 from the 14C-labelled 1-dodecanol and labelled phosphorus iodide (equation 203). Double-labelling has been chosen to optimize the radioiodine decontamination of the organic phase of the nuclear fuel reprocessing cycle and to study the exchange kinetics of iodine between the elemental and the bound forms430. 

Iron sesqui-phosphide, Fe2P3, may be prepared by heating ferric chloride to dull redness m phosphorus vapour,8 or by the action of phosphorus iodide upon reduced iron.9 It crystallises in brilliant grey needles, is not magnetic, and is insoluble in hydrochloric and in nitric acid, as also in aqua regia. It loses phosphorus when heated in air at bright red heat, and is slowly attacked by chlorine at dull red heat. 

A different approach toward preparation of phosphinous and phosphonous iodides uses the reaction of iodoalkanes with either PI3 or PI5. This reaction is specific for iodoalkanes and phosphorus iodides and is not applicable to other halides. From the resultant highly reactive phosphinous and phosphonous iodides, the full range of the parent acid derivatives may be prepared (esters, other acid halides, anhydrides, amides). We will not be concerned here with these preparations of derivatives of the parent acids, topics that are considered in other reports. ... 

This substance, which has well-known lachrymatory properties, may be obtained according to Cannizzaro by the action of phosphorus iodide with benzyl alcohol or by the action of potassium iodide on benzyl chloride or bromide. 

The action of phosphorus iodide on poly-add alcohols is similar to the action of hydriodic acid referred to under Reaction i. 

Preparation of Methyl Iodide from Methyl Alcohol and Phosphorus Iodide (SECTIONS 55, 252).—In a 200-cc. round-bottomed flask place 15 grams of methyl alcohol and 3.2 grams of red phosphorus. Have ready a reflux condenser with cork attached. Place the flask in cold water and add in small portions at a time 38 grams of iodine the addition should take about 10 minutes. If the contents of the flask begin to boil,... 

Discussion Just as hydrobromic acid can be prepared by the action of water on phosphorus bromide, so hydriodic acid can be prepared from water and phosphorus iodide. The phosphorus iodide can be made by the direct union of phosphorus and iodine. 

To what compound is the action presumably due (4) What is the reason for this belief (5) Write an equation for the reaction between the water and the phosphorus iodide. 

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