3Q 



"D29° 



of 



the distillate 



a D20° 

 of the re- 

 sidue 



Pure lemon oil ...... 



with io°/ lemon oil terpenes 

 lemon oil terpenes . . . . 



+ 59°2 4 ' 

 + 59°55' 

 + 6 3 ° 4 i' 



+ 6o°3 4 ' 

 + 6o°3 9 ' 



+ 62°23' 



-57°38' 

 •58°52' 

 •6 4 °33' 



In this case Berte's method has failed, as the adulterated oil 

 gives results which correspond with those of the pure oil. 



We readily admit that the distillation method introduced by us 

 in 1896, which of course is only directed against the adulteration 

 with turpentine oil, at that time the only one practised, will equally 

 fail to bring us to the end in view; but we only wish to show by 

 the above example that the process recommended by Berte is not 

 nearly as reliable as would appear from the tests carried out by himself. 



When the opportunity arises we will return to this subject. 



E. Schmidt 1 ) has succeeded in clearing up the constitution of 

 citroptene which has also been examined already by others. Citroptene, 

 obtained from the crystalline distillation-residues of lemon oil by treat- 

 ment with ether, is a granular crystalline mass insoluble in ether, which 

 after repeated recrystallisation from acetone and methyl alcohol and also 

 from dilute alcohol, with the addition of animal charcoal, was obtained 

 in the form of brilliant colourless needles of the melting point 146 to 147 . 



The solutions show a beautiful blue-violet fluorescence. The analysis 

 gives the composition C lt H 10 O 4 , and the methoxyl-determination the 

 content of two methoxyl-groups. When melted with potash, phloro- 

 glucinol and acetic acid were formed. With bromine in chloroform solution 

 citroptene combines into a dibromide C 10 H 10 Br 2 O 4 melting at 250 to 

 260 . The assumption that citroptene is a methylated dioxycoumarin, 

 was confirmed by synthesis of the body. Starting from phloroglucinol, 

 Schmidt, by conversion of this phenol into phloroglucinic aldehyde, 

 and condensation of the latter according to the coumarin synthesis, 

 obtained a dioxycoumarin which on methylation yielded a compound 

 which corresponded in its properties with citroptene. Melting point 

 The following formula therefore belongs to citroptene: 

 H OCH Q 



146 to 14; 



CH Q 0< 



CH-CH 



H O.CO 

 Mandarin Oil. Owing to small stocks, this oil fetches good prices, 

 whilst future oil, with bad prospects for the coming harvest, is offered 

 at still higher quotations for forward delivery. 



x ) Arch, der Pharm. 242 (1904), 288. 



