ON TIIK rO^STrmTlOX of fAMPHOM. :i()r) 



Camphoric acid also yields two series of alkyl hydrogen esters, wliich 

 have been obtained in the following way : — 



Camphoric anhydride when treated with sodium ethoxide yields tho 

 sodium salt of o9-/Ao-ethyl hydrogen caniphorate 



ONa O 



CH . CO. CH . C^OEt CH . C . OEt 

 ! ">0 + Et.ONa-> : >0 -> : 

 C.CO / C.CO/ C.CO.ONa 



C C C 



Camphoric Anhydrido. ortJw-'Ethyl Hydrogen 



Ciiniphornte. 



Diethyl camphorate when hydrolysed with soda, however, affords tlie 

 sodium salt of aUn-ethyl hydrogen camphorate. 



OEt 



The carboxyl groups of camphoric acid have therefore been referred 

 to in two different ways, namely — 



CH . COOH («- or ortho-) 



C.COOH(/?-orallo-) 



C 



The above inferences regarding the constitution of the two carnphor- 

 amic acids and the two ethyl hydrogen camphorates receive confirmation 

 in the behaviour of the former on treatment with hypobromite (compare 

 E. 2. c), and of the latter when subjected to electrolysis (compare E. 2. a.). 



(c) The ^- or AUo.carbo.ryl Group of Camphoric Acid represents the Carbovi/l 



Grovp of Camphor. 



Whilst the facts on which this conclusion depends are few in number, 

 they are such as to render their interpretation simple and beyond (|ues- 

 tion. The following may be mentioned here. 



When isoniti'osocamphor is warmed with hydrochloric acid it i.s 

 converted into a-t?amphoramic acid,' and, in accordance with the oon- 



' Clalsen add Mawftsee, 4m«,, 874, 7!] 

 lOOO, jt 



