350 VII. ACIDS, AMIDES, ALDEHYDES AND HYDROCARBONS 



Penzoldt"^ reported the presence of this product in "naphthalene urine" 

 as early as 1886, no investigators have since confirmed or denied this 

 statement. 



(b) Hydrogenated Naphthalenes. Considerable information is available 

 concerning the two hydrogenated naphthalenes, namely tetrahydronaph- 

 thalene or tetralin, 



and decahydronaphthalene or decalin, 



In the case of tetralin, Pohl and Rawicz-^^ observed that tetralylglucu- 

 ronic acid, a dihydronaphthalene of unknown composition, and naphthalene, 

 were present in the urine. Rockemann-^^ reported that different glucuron- 

 ides are formed by dogs and by rabbits, respectively, when tetralin is 

 fed; in the first case, ac-a-tetralylglucuronide (tetralol) is formed, while 

 in the second instance ac-/3-tetralylglucuronide is the product excreted. 



OCeHgOe 



OCeHsOe 

 H2 ^ ]}\ JH2 



H2 



ac-a-Tetralylglucuronide ac-(8-Tetraglucuronide 



(Dog urine) (Rabbit urine) 



Bernhard^^* was unable to isolate the glucuronide after feeding 30 g. of 

 tetralin, although he did prove the presence of glucuronic acid in the urine 

 concentrate. 



271 p Penzoldt, Naunyn-Schmiedeberg' s Arch. expU. Pathol. Pharmakol., 21, 34-40 

 (1886). 



2" J. Pohl and M. Rawicz, Z. physiol. Chem., IO4, 95-104 (1919). 



'^'^ W. Rockemann, Naunyn-Schmiedeberg' s Arch, exptl. Pathol. Pharmakol., 92, 52-67 

 (1922). 



"^ K. Bernhard, Z. physiol. Chem., 257, 54-60 (1938). 



