— 121 — 



/J-benzyl camphene can readily be obtained by dehydration with the 

 application of heat, by means of the above-mentioned reagents. This 

 isomeride of a-benzyl camphene passes over at 150 to 161 (11 mm. 

 pressure), crystallises in a freezing mixture into needles melting at 24 , 

 and has in alcoholic solution the rotatory power [«]p — 6o°44 ; . But this 

 is not the only hydrocarbon formed. Haller and Bauer have, besides 

 the crystals, also separated off an oil which appears to be a liquid 

 isomeride of the solid body. For the two the following formulae 

 would apply: — 



I. II. 



,CH 7 CH 2 



c 8 h/ 11 c 8 h/ I 



\ c — CH 9 ..C-H, > C = CH • C fi H r 



From tertiary phenyl borneol 



•CH 2 



/J-phenyl camphene is formed quantitatively by heating with pyruvic 

 acid. It represents an oil passing over at 138 to 141 (10 mm. 

 pressure); dg 0,9736; M D -f- 7 °i 5 / . 



It is well known that J. Houben and L. Kesselkaul 1 ), and 

 recently also A. Hesse 2 ) have studied the conversion of pinene 

 hydrochloride into the corresponding organomagnesium compound. The 

 former then obtained, by the action of carbon dioxide on the reaction- 

 mixture, hydropinene carboxylic acid. W. Borsche and W. Lange 3 ) 

 have now obtained by means of sulphur dioxide from the magnesium 

 compound of pinene hydrochloride, camphane-2-sulphinic acid 



H 9 C C CH-SCXH 



H C CH CH, 



This acid, also designated by the authors "camphyl sulphinic acid", 

 can readily be converted into its bromide, from which by reduction 

 with tin and hydrochloric acid camphyl sulphydrate (thiobomeol) 



*) Berl. Berichte 35 (1902), 2519 and 3695; 38 (1905), 3796; Report 

 April 1906, 116. 



2 ) Berl. Berichte 39 (1906), 11 27; comp. also the present Report, p. in. 



3 ) Berl. Berichte 39 (1906), 2346. 



