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VII. " On the Formation and some of the Properties of Cymi- 

 dine, the Organic Base of the Cymol Series." By the Kev. 

 JOHN BARLOW, F.R.S., Sec. R. Inst. Received June 14, 

 1855. 



The object of this memoir is to detail the process by which an 

 organic base, provisionally named Cymidine, was obtained from the 

 hydrocarbon, cymol, and to describe some of its properties, and 

 certain phenomena attending its production. 



The substitution-product, nitrocymol, was procured by acting on 

 cymol by strong nitric acid, both liquids being kept at the tempera- 

 ture 17|Cent. (0Fahr.). From nitrocymol, cymidine was ob- 

 tained by Bechamp's modification of Zinin's process, and results of 

 analyses, made by combustion of the platinum salt, and likewise by 

 a silver determination of the hydrochlorate, were found to coincide 

 with the formula C 20 H 15 N. In the formation of cymidine a neutral 

 oil occurred, having the same boiling-point with cymol. From this 

 hydrocarbon a substitution compound was derived, apparently iso- 

 meric with, but possessing a less specific gravity than nitrocymol. 

 This nitro-compound was also subjected to the process of reduction 

 already described, and a basic substance was formed from it, which 

 was identified by a platinum determination with cymidine. Some 

 qualitative experiments, made with cymidine, were also described, 

 and the memoir concluded with the following synoptical table of the 

 homologues of the benzol series. 



Hydrocarbons. 

 Benzol C 12 H 6 

 Toluol C 14 H 8 

 Xylol C 16 H 10 

 Cumol C 18 H 12 

 Cymol C 20 H 14 



Nitro-substances. 

 Nitrobenzol C 12 H 5 NO 4 

 Nitrotoluol C 14 H 7 NO 4 

 Nitroxylol C 16 H 9 NO 4 

 Nitrocumol C 18 H n NO 4 

 Nitrocymol C 20 H 13 NO 4 



Bases. 



Aniline C 12 H 7 N 

 Toluidine C 14 H 9 N 

 Xylidine C 16 H n N 

 Ciynidine C 18 H 13 N 

 Cymidine C 20 H I5 N. 



