ELISHA MITCHELL SCIENTIFIC SOCIETY. 6/ 



From this it was assatued that the wished-for substance was ren- 

 dered impure by dioctyl. To confirm this the mono-brom-compound 

 of the substance was prepared with bromine water in the usual way 

 and the unaltered dioctyl removed by distillation. A clear yellow 

 liquid was then gotten which solidified to crystals in the cold. These 

 melted by 20='. A bromine analysis gave 27.86 p. c, calculated for 

 C13H21 S Br 27.75. Some of this bromine compound was dissolved 

 in alcohol and treated with sodium amalgam. After extraction with 

 ether and purification a clear liquid was gotten which solidified to 

 crystals in the cold. These melted at 10'. 



Preparation of octylmethylthiophen. — The preparation was sim- 

 ilar to that of methyloctylthiophen. 8 g. iodoctylthiophen, 5 g. 

 methyl iodide and 2.5 g. sodium, with double the volume of ether 

 were used. The reaction seemed complete after standing five days. 

 The ether was then distilled off and the remainder distilled by gen- 

 tle heat. This was further fractionated. A colorless oil was thus 

 gotten. It boiled at 270° and solidifies in the cold to crystals which 

 melt at 10°. A sulphur determination gave p. c. S = 15.58 — calcu- 

 lated for C13H.3S p. c. S =15.24. 



To compare this better with methyloctylthiophen, this too was 

 brominated. Crystals were thus obtained melting at 20^ A bro- 

 mine determination gave p. c. Br = 27. 9d — calculated for Ci-^HaiS 

 Br. p. c. Br = 27.75. The two compounds methyloctylthiophen and 

 octylmethylthiophen are therefore to be looked upon as identical. 



In accordance with what has hitherto been communicated as to 

 the structure of the thiophen compounds, the following formula 

 must be ascribed to them : 



CH — CH 



/ \ 



CH3 — C C — C^Hi^ 



\ / 



S 



E. A. VON SCHWEINITZ, 



Got tinge n, Laboi-aiory of the University. 



