106 ACETIC ALDEHYDE. 



thoroughly saturating ethyl alcohol with dry chlorine, 

 and distilling the crystalline product after the addition 

 of concentrated sulphuric acid. Colorless liquid, of a 

 penetrating odor ; specific gravity, 1.502, boils at 94.4. 

 "When kept for a time it is changed to a solid polymeric 

 body, from which it can be regenerated by heating. 

 Like aldehyde it combines with ammonia and the 

 bisulphites of the alkalies. Yields trichloracetic acid 

 by oxidation, dichloracetic acid by treatment with 

 silver oxide and water, and is resolved into chloro- 

 form and formic acid by treatment with alkalies in 

 aqueous solutions. "When taken internally in small 

 quantities it causes sleep. Combines with water, form- 

 ing chloral-hydrate C 2 HC1 3 -f H 2 0, a substance that 

 crystallizes well (fusing point, 46 ; boiling point, 96- 

 98 ; insoluble in water); with alcohol forming chloral- 

 alcoholate C 2 HC1 3 + C 2 H 6 0. Colorless crystals ; fusing 

 point, 56; boiling point, 114-115. This compound 

 is the final product of the action of chlorine on alcohol. 



Dibromaldehyde, CHBr'.CHO. By bringing bro- 

 mine and aldehyde together carefully. Colorless, long 

 needles, of a penetrating odor, exciting to tears. 



Tribromaldehyde (Bromal), CB^.CHO. Is prepared 

 in the same manner as chloral, and resembles it in 

 every respect. 



Sulphaldehyde, C 6 H 12 S 3 = (CH 3 .CHS) 3 . When sul- 

 phuretted hydrogen is conducted into an aqueous 

 solution of aldehyde, an oil C 2 H 4 S + C 2 H 4 0, of a disa- 

 greeable odor, congealing at 8, is precipitated, which, 

 when distilled, or, better, when treated with hydro- 

 chloric acid, yields sulphaldehyde. White needles, 

 insoluble in water, easily soluble in alcohol and ether. 

 Begins to sublime at 45. 



Trialdine, C 6 H 13 NS 2 , crystallizes from a watery solu- 

 tion of aldehyde-ammonia when sulphuretted hydrogen 

 is conducted into it. Large, colorless crystals, fusing 



