188 M. Piria on the formation of Aldehydes. 



and if RO is the general formula of the corresponding anhydrous 

 organic acid, the reaction will be thus expressed : — 

 2R0H0 + PCF=C1H + P03, H0 + 2RC1. 



The preparation by this process, using quantities required by 

 equation, is effected with as much ease as the preparation of nitric 

 acid, and the product obtained corresponds very closely with the 

 theoretical requirements. 



M. Boullet* has found that several nitro-acids analogous with 

 nitrobenzoic acid are reduced to the con-esponding amido-acids 

 by the action of acetate of iron ; and that acetate of iron acts 

 upon the jethers of the nitro-acids and produces the aethers of 

 the corresponding amido-acids. 



M. Piria t has given a general method for the transformation 

 of some acids into the corresponding aldehydes. If the compo- 

 sition of benzoate and of formiate of lime be represented by the 

 formulas 



C2 03(Ci2H5)CaO 



C2 03( H)CaO, 



it is evident that it is sufficient that the group C^O^(C'^H^) 

 exchange 1 equiv. of oxygen for 1 equiv. of hydrogen of the 

 group C'^O^(H), in order that the first be transformed into hy- 

 dride of beuzoyle, C^ 0^ (C- H'^)H, and the second into carbonic 

 acid. And, in fact, by distilling together au intimate mixture 

 of formiate and benzoate of lime, this decomposition takes place 

 and oil of bitter almonds is produced. Piria has also produced 

 in this way the hydrides of cinnamyle and of anisyle from their 

 corresponding acids. 



This method is the same as that proposed by Limpricht J. It 

 appears that it was communicated to Liebig's Annalen in 1855, 

 but that by an oversight its publication was delayed. 



By the dry distillation of camphorate of lime, M. Lies Bodart 

 obtained in 1849, in conjunction with Gerhardt, an oil to which 

 the name phorone was given. It is camphoric acid, minus car- 

 bonic acid, 



C20H14O6, 2CaO = Ci8Hi4 02 4-2(CaOC02). 



jCamphorate of lime. Phorone. Carbonate of lime. 



By distilling grape-sugar with lime, M. Bodart § has found that 

 this substance is produced along with Fremy's metacetone,C^H^O. 



* Comptes Rendus, August 18, 1856. 



t II Nuovo Cimento, vol. iii. p. 126, Liebig's Annalen, October 1856, 



+ Phil. Mag. Jidy 1856, p. 57. 



§ Comptes Rendus, August 18, 1856. 



