460 R. ROBINSON AND H. G. SMITH. 
liquid was diluted with water and the precipitated solid 
crystalline substance separated and crystallised from 
methyl alcohol, and then again from ethyl alcohol. It was 
so obtained in pale yellow needles which melted at 132°, 
and at the same temperature when mixed with an equal 
quantity of 4: 5-dinitroveratrol. The substance was 
further identified with 4: 5-dinitroveratrol by a careful 
direct comparison, and by the preparation of a quinoxaline 
derivative by reduction and condensation with phenan- 
threnequinone in the usual manner. The nitric acid solution 
after separation of the dinitroveratrol was examined and 
found to contain oxalic acid. 
This important experiment was performed quantitatively 
and it was found that the yield of dinitroveratrol was 
greater than the theoretical on the assumption that the 
molecule of eudesmin contains only one veratrol nucleus. 
It is, therefore, beyond question that eudesmin contains in 
its molecule two veratrol nuclei. 
0°6451 gr. eudesmin gave by the above method 0°6926 gr. 
dinitroveratrol, perfectly dry but in the crude condition. 
This is a yield of 90 per cent. on the assumption that there 
are two veratrol nuclei. After crystallisation the amount 
of perfectly pure dinitroveratrol was 0°531 gr., a yield of 
69 per cent. 
Me O —CgHsO2- O Me 
Dichloreudesmin, 
Me O iy Cl Cl O Me 
A slow stream of chlorine was passed through a well 
cooled solution of eudesmin (5 gr.) in acetic acid (50 ccm.) 
during half an hour. Hydrochloric acid was produced and 
a very sparingly soluble crystalline substance precipitated. 
After dilution with an equal volume of water, the solid 
was collected and crystallised, first from acetic acid 
