ALLYL ALCOHOL. 121 



this by distilling repeatedly with water. (On its pre- 

 paration from mustard-seed, see Glucosides, Myronic 

 Acid.) Colorless liquid, of an agreeable, leeky odor, 

 boiling at 117-118. 



By the action of silver cyanide on allyl iodide, a 

 compound is formed, which is isomeric with allyl 

 cyanide. 



Allylether, (C 3 H 5 ) 2 0, results from the action of 

 allyl iodide on silver or mercury oxide, and from the 

 decomposition of potassium allylate by means of allyl 

 iodide. Colorless liquid, insoluble in water, boiling 

 at 82. A body of the same composition (allyl oxide), 

 which is perhaps identical with allylether, occurs in 

 crude oil of garlic. The compound ethers of allyl 

 alcohol are formed by the action of allyl iodide on the 

 silver salts of the respective acids. 



Allyl formate, CHO.O.C 3 !! 5 , is formed as a second- 

 ary product in the preparation of formic acid from 

 oxalic acid and glycerin (p. 76). Liquid, of a sharp 

 odor; specific gravity, 0.932; boiling point, 81-83. 



Allyl acetate, C 2 H 3 O.O.C 3 H 5 . A liquid, with a 

 penetrating odor, boiling at 98-100. 



Allyl valerate, C 5 H 9 O.O.C 3 H 5 , boils at 162. 



Allyl sulphide (oil of garlic), (C 3 H 5 ) 2 S. By the dis- 

 tillation of garlic (bulbs of Allium sativum) with water, 

 a heavy, yellow oil is obtained, which contains allyl 

 sulphide as its principal ingredient. By repeated recti- 

 fication, finally over potassium, it is obtained in a 

 free condition. It is further contained in the leaves of 

 Alliaria officinalis, and in the seeds and green portions 

 of a great many other plants of the cruciferous order. 

 It can be prepared artificially by the action of an 

 alcoholic solution of potassium sulphide on allyl 

 iodide. Colorless oil, of a repulsive odor, which 

 boils at 140. Gives a crystalline precipitate of 

 (C 3 H 5 ) 2 S + 2AgN0 3 with an alcoholic solution of sil- 

 11 



