120 ALLYL ALCOHOL. 



Properties. Colorless liquid of a pungent odor; 

 specific gravity, 0.858 at ; boiling point, 96-97 ; 

 congeals at 50. Mixes with water in all propor- 

 tions. Combines with two atoms of chlorine or bromine 

 without elimination of hydrogen; does not combine 

 with hydrogen. Heated with potassium hydroxide to 

 100-150, it yields propyl alcohol, ethyl alcohol, formic 

 acid, and other products. 



Allyl chloride, C 3 H 5 C1 = CH 2 :CH.CH 2 C1 (isomeric 

 with monochlorpropylerie). By allowing hydrochloric 

 acid or phosphorus terchloride to act upon allyl alcohol ; 

 by bringing an alcoholic solution of allyl iodide together 

 with mercury chloride ; and by heating allyl oxalate 

 with an alcoholic solution of calcium chloride to 100. 

 Colorless liquid, boiling at 46 ; specific gravity, 

 0.954 at 0. 



Allyl bromide, C 3 H 5 Br. Colorless liquid ; boiling 

 point, 70-71 ; specific gravity, 1.461 at 0. 



Allyl iodide, C 3 H 5 I. Prepared from allyl alcohol, 

 like ethyl iodide from ethyl alcohol (p. 46). Most 

 expediently by adding 6 parts phosphorus gradually 

 to a mixture of 15 parts glycerin and 10 parts iodine. 

 After the reaction, which is frequently very violent, 

 is finished, the substance is distilled off, the distillate 

 washed with water. and caustic soda, dehydrated and 

 rectified ; that portion which passes over between 98- 

 103 is pure allyl iodide. Colorless liquid, of an un- 

 pleasant, leeky odor ; boiling at 101 ; specific gravity, 

 1.789. When its alcoholic solution is shaken with 

 mercury, mercurallyl iodide C 3 H 5 IHg is formed. Color- 

 less laminae, difficultly soluble in alcohol ; when dis- 

 tilled with iodine, yields allyl iodide ; when treated 

 with hydrochloric or hydriodic acids, yields propylene. 

 Hydriodic acid converts allyl iodide into isopropyl 

 iodide. 



Allyl cyanide, C 4 H 5 N = C 3 H 5 .CN, is contained in 

 the mustard-oil of commerce, and is prepared from 



