— ii7 — 



Letts 1 ), from pinene hydrochloride and sodium, and whose melting 

 point the above-mentioned authois indicated as 75 , boiling point 

 326 to 327 . 



Borneol is also formed, in a yield of about 2O°/ , when magnesium 

 is allowed to act on pinene hydrochloride. It is present, in addition 

 to hydrodicamphene, in the ethereal layer of the reaction mass, and 

 distils over in the first fractions. It was produced in the pure state 

 by esterification of the corresponding fractions with phthalic acid 

 anhydride. Borneol owes its origin clearly to the action of the oxygen 

 of the air on hydropinene magnesium chloride, when in all probability 

 borneolate is formed. 



By the action of magnesium and carbon dioxide on bornyl 

 chloride C 10 H 17 Q, an acid of the melting point 72 is formed, 

 bornyl carboxylic acid C 10 H 17 COOH, which is identical in every respect 

 with hydropinene carboxylic acid. 



Alcohols. 



When reducing carvacrol according to the method of Sabatier 

 and Sender ens 2 ), L. Brunei 3 ) obtained two isomeric alcohols of the 

 formula C 10 H 20 O. The compounds, designated as a- and /?-carvacro- 

 menthols, have the following properties: 



a-Carvacromenthol is an oily, colourless liquid with the odour 

 of safrol and thyme oil. The boiling point lies at 219 . 



/S-Carvacromenthol could be purified by its phthalic acid 

 compound, which could be recrystallised from alcohol; it is an oily, 

 colourless liquid with a pleasant odour reminding of safrol and pepper- 

 mint. Boiling point 2 2 2°; d oo,9i8. Of this alcohol the following 

 derivatives were produced; 1. /J-carvacromenthyl formate, from formic 

 acid and the alcohol; boiling point 229 d o 0,954. — 2. /?-carvacro- 

 menthyl acetate, from acetic acid and the alcohol at 130 ; boiling 

 point 231,5°; d o 0,933. — 3. The acid succinic ester from succinic 

 anhydride and the alcohol; melting point 74°. — 4. The acid phthalic 

 ester from phthalic anhydride and the alcohol; melting point 13 6°. 



Menthol. J. Kondakow 4 ) enters into theoretical considerations 

 on the subject of the five stereo-isomeric menthols hitherto known. 

 He mentions first the ordinary 1-menthol, whose properties and 

 derivatives have hitherto been examined most in. detail. It is well 

 known that in the production of these derivatives, both stereo- 



*) Berl. Berichte 13 (1880), 793. 



2 ) Comp. Report October 1905, 100—105. 



3 ) Compt. rend. 141 (1905), 1245. 



4 ) Journ. f. prakt. Chem. II. 72 (1905), 185. 



