— 1% — 



yielded the corresponding carbonate, m. p. 105°, from which, with methyl 

 alcohol, a monocarbonic ester, m. p. 115°, was prepared. The same ester 

 was obtainable from the sodium salt of the aldehyde. The authors also 

 discuss the colour-properties of the separate derivatives of o-protocatechuic 

 aldehyde, but for these details, as well as for particulars of Nolting's very 

 voluminous paper, we refer to the original. 



Cinnamic Aldehyde. Nupharin, C13H24O2N2, an alkaloid which 

 occurs in the root-stock of he yellow pond-lily, Nuphar luteum t has been 

 found by A. Goris and L. Crete 1 ) to yield, when treated with silico-tungstic 

 acid, a salt which is of interest because when decomposed with baryta- 

 water it eliminates cinnamic aldehyde. 



Ketones. 



On the behaviour of methylheptenone when exposed to light, see 163. 



On the occurrence of methylheptyl- and -nonylketone and the reduc- 

 tion of the last-named, see Essential cocoanut oil, p. 40. 



Camphor. In one of our last Reports 2 ), we noted the attacks made by 

 G. Blanc upon Komppa's synthesis of camphoric acid and camphor. In 

 connection with the detailed publication of Komppa's 3 ) investigations, Blanc, 

 in conjunction with J. F. Thorpe 4 ), now raises the fresh objection that the 

 ester, m. p. 85 to 88°, obtained by Komppa when methylating diketoapo- 

 ester, and said to represent the formula 



^-C0 2 CH 3 

 COCH<^ 



/C(CH 3 ) 2 

 CO-C(CH 3 )( 



x C0 2 CH 3 



is in reality not constituted according to this formula at all, but represents 

 an isomeric enolic ether of the following structure: 



X0 2 CH 3 



CO CH\ 



I )C(CH 3 ) 2 



C(OCH 3 ) = C< 



x C0 2 CH 3 



The said authors base their theory upon the ground that when the 

 alleged C-methylated diketonic ester is treated with a cold aqueous potash 



x ) Bull. Sciences pharm. 17 (1910), 13; quoted from Chem. Zentralbl. 1910, I. 1266. 



2 ) Report October 1909, 198. 



>) Comp. Report April 1910, 178. 



4 ) Proceed, chem. Soc. 26 (1910), 83; Journ. chem. Soc. 97 (1910), 836. 



