— 155 — 



accomplished by Semmler jointly with McKenzie was (as Semmler 

 declares) already completed. A comparison of Kondakow's and 

 Semmler's formulae, the derivatives produced by Semmler and 

 McKenzie, and finally also the synthesis of diosphenol, speak for 

 themselves in favour of Semmler's claim, which is not shaken by a 

 reiterated reply of Kondakow 1 ). 



Cyclohexanone and allied bodies. Part IX of the terpene 

 syntheses of W. H. Perkinjun. 2 ) deals with the production of cyclo- 

 pentanone-4-carboxylic acid and cyclohexanone - 4 - carboxylic acid 

 ((5-ketohexahydrobenzoic acid). We would refer to the original work, 

 and also to Wallach's 3 ) experiments with the condensation products 

 of cyclohexanone with hydrochloric acid, and finally to a work by 

 C. Mannich 4 ) on the condensation of cyclohexanone with methyl 

 alcoholic sulphuric acid. 



If the anhydrides of 3, 3 -dimethyl- or 3, 3, 6-trimethyl pimelic 

 acids are distilled slowly at ordinary pressure, according to G. Blanc 5 ), 

 they are converted quantitatively, with loss of carbonic acid and ring- 

 closure, in the corresponding cyclohexanones. 3, 3 -Dimethyl cyclo- 

 hexanone possesses a menthone-like odour, boils at 1 73 , and yields 

 a semicarbazone of the m. p. 203 . 



3, 3, 6-Trimethyl cyclohexanone (I) which in its constitution is 

 closely allied to the pulenone (II) produced by Walla ch and Kempe 6 ), 

 (as shown by the following formulae), has a powerful menthone odour, 

 and boils at 186 ; its semicarbazone melts at 170 . 



I. II. 



CH 3 C i_ C0 CH 3 CQ CH 2 



CH/ X / CH/ X / 



CH 2 CH 2 3 CH, CH 2 



Acids. 



By his previous experiments E. Erlenmeyer jun. 7 ) had found 

 that a salt melting at 13 5 , whose 1 per cent, solution is inactive, 

 is always formed in alcoholic solution from molecular quantities of 

 brucine and natural cinnamic acid, but under suitable conditions 



*) Chem. Ztg. 31 (1907), 90. 



2 ) Journ. chem. Soc. 89 (1906), 1640; comp. ibidem 85 (1904), 418: also Berl. 

 Berichte 27 (1894), I02 > 9^5- 



3 ) Berl. Berichte 40 (1907), 70. 



4 ) Ibidem, 153. 



■) Compt. rend. 144 (1907), 143. 



6 ) Liebig's Annalen 329 (1903), 82; Report April 1904, 1 2 1. 



7 ) Berl. Berichte 39 (1906), 285, 1570; Report October 1906, 152. 



