70 



Dr. Hofmann on. Homohgues and Analogues Recess, 



Methylic Mustard-oil. 

 I formerly obtained the methyl-compound as an oily liquid boiling at 

 120°, and powerfully smelling of horseradish. When a somewhat larger 

 quantity of this body was prepared according to the process above described, 

 the liquid, after distillation with the vapour of water, solidified to a splendid 

 crystalline body . 



Composition, C 2 H 3 N S=^ J N. 



Boiling-point 119°; fusing-point 34°; solidifying-point 26°. 



Referred to hydrogen. Referred to air. 



Theory. Experiment. Theory. Experiment. 



Gas-volume weight of methylic 



mustard-oil (determined in the V 36*5 37*89 2*52 2*61 



vapour of boiling water) . . 



Amylic Mustard-oil. 

 I have also prepared the amyl-compound on a larger scale by a slight 

 modification of the process above described. Instead of separating the com- 

 pound from the mercury precipitate obtained in the dilute alcoholic solu- 

 tion at once by distillation, it is advisable to return the vapours, condensed 

 by a cooler, for some time to the boiling mixture. When the reaction 

 is complete, the sulphide of mercury is filtered off, the amylic mustard-oil 

 precipitated by water, dried over chloride of calcium, and ultimately puri- 

 fied by distillation. The odour of the compound is analogous to those of 

 the methyl- and ethyl-body, but less pronounced. 



C H 1 



Composition, C 6 H u NS=^ j S. 

 Boiling-point 183° to 184°. 



Referred to hydrogen. Referred to air. 

 Theory. Experiment. Theory. Experiment. 



Gas-volume weight of amylic mus- ] 



tard-oil (determined in the va- I 64*5 63-42 4*48 4*40 

 pour of boiling aniline) J 



Tolylic Mustard-oil. 

 As has already been pointed out, the new process cannot be used for pre- 

 paring the mustard-oils of the aromatic series, at all events in the narrower 

 sense of the word. I may mention, however, that tolylic mustard-oil may 

 be readily obtained by the process which I had formerly used for pro- 

 ducing the corresponding compound of the phenyl-series. The ditolyl- 

 sulphocarbamide required for this purpose is known ; it was examined some 

 years ago by M. Sell. If this body be distilled with anhydrous phosphoric 

 acid, aromatic vapours are evolved which may be condensed to a yellowish 

 oil rapidly assuming the crystalline form. The product of distillation 



