338 



on piperidine in excess, we prepared, from the 1-5-dibroniide, the 

 a-methjipentamelhj'lene piperidinium bromide: 



yCH, — CH,v yCH, — CH,v 

 CH,( ;n( ;CH. . . .. (I) 



i Br 



By recrjstallisation from alcohol-ether it is obtained as a white 

 crystalline substance, melting above 290° (Br found 32.63, calc. 32.5). 



In an analogous way Ihe 1-4-dibromide yielded the «-aethyltetra- 

 methylene piperidinium bromide: 



CH, — CH,\ /CHj — CH,v 



I >N( )CH, .... (II) 



CH,— CH/ I \CH — CH/ 

 I Br 



This substance melted at 270° corr. (Br 32.58 found, 32.5 calc). 



The dibromide obtained from the reduced oxide, CgHi,0, treated 

 in the same way, yielded a substance melting at 269° (corr.). (111). 

 A mixture of this substance and the preceding one melted sharply 

 at 269° corr. 



Hence the 1-4-hexane dibromide and the dibromo derivative of 

 tlie reduced oxide are identical. 



Moreover we prepared double salts with platini chloride which 

 likewise present the same analogy in their melting-points and in 

 those of their mixtures. 



From (I) (C,,H„NBr), PtCl, Pt. found 23.4 

 M.P. 247° corr. 



From II M.P. 260° „ „ „ 23.5 



From III MP. 259° „ „ „ 23.4 



Mixed melting-point I and II 246° corr. 



II and III 260° .. 



calc. 23.5 



Here again appears the analogy between the compound obtained 

 from the 1-4-oxide and that which was prepared from the reduced 

 oxide, CgHijO. Consequently this reduced oxide may really be 

 regarded as «-ethyltetrahydrofurane and the unsaturated oxide C^HgO 

 of Fauconnikr as «-vinyklihydrofurane: 



