56 IVIESSES. E. FEANKLAND AND B. F. DUPPA'S 



lyzed is proved by the isolation of methylated acetone — its derivative ketone, as described 

 belovp. 



To the properties of ethylic methacetone carbonate described by Geuthee, we have 

 only to add that, in opposition to this chemist's statement, it is very readily decom- 

 posed by aqueous potash, with the formation of methylated acetone according to the 

 following equation : — 



S3 



o 



+2KHO=C<;OK+C2H5 0H+C3- 



v_ 



OK "-TTX 



Alcohol. 



0_ 

 CH3 



IH2 



Ethylic methacetone Potassium Methylated 



carbonate. carbonate. acetone. 



Condensed to the radical type, the formula of methylated acetone becomes 



rCMeO 

 (CMeHa. 

 Methylated acetone is best obtained in a state of purity by combining it with sodium 

 bisulphite, pressing the beautiful crystalline compound so formed between folds of blot- 

 ting-paper to remove traces of dimethylated acetone, exposing it over sulphuric acid in 

 'vacuo, and then regenerating the methylated acetone by distillation with aqueous potash. 

 The liquid so obtained, after drying over quicklime and rectification, gave the following 

 analytical results: — 



I. -1946 grm. gave -4759 grm. carbonic acid and -1981 grm. water. 

 II. -1461 grm. gave -3557 grm. carbonic acid and -1504 grm. water. 



These numbers agree well with the above formula. 



Calculated. Found. 



^ f ^ 



I. II. Mean. 



66-66 66-69 66-40 66-55 



11-11 11-31 11-44 11-37 



22-23 



100-00 



Methylated acetone is a colourless, transparent, and very mobile liquid, possessing an 

 odour like chloroform, but more pungent. It is tolerably soluble in water, and more 

 than slightly so in a saturated solution of common salt. Its specific gravity is -8125 at 

 ] 3° C. It boils at 81° C, and its vapour-density is 2-52, as given by the following data, 

 the theoretical number being 2-49. 



Weight of methylated acetone -1166 grm. 



Observed volume of vapour 55-39 cub. centims. 



Temperature of bath 112° C. 



Height of barometer 757 millims. 



