524 Scientific Proceedings, Royal Dublin Society. 
5. Amido-m-axylylacetone, CH;CO - CH(C,H,)NH,, is obtained 
as hydrochloride by adding slowly 4:2 gs. i-nitroso-m-xylylacetone 
to a solution of 10 gs. crystallized stannous chloride in 15 c.c. 
fuming hydrochloric acid, with vigorous shaking and good cooling. 
During the experiment, the tin double salt separates out, and is 
dissolved in 200 c.c. water, which is heated on the water-bath for 
15 minutes with granulated tin to convert the stannic into the 
stannous salt. The tin is precipitated with sulphuretted hydrogen, 
and filtered. On evaporating the filtrate at first over the free 
flame, and finally in a vacuum at 45° C., the residue crystallizes on 
cooling. It was dried in a desiccator over sulphuric acid, dissolved 
in a small quantity of hot absolute alcohol, and filtered from traces 
of salammoniac. On cooling, the hydrochloride of the amidoketone 
was precipitated by addition of absolute ether in crystals melting 
at 150-151°. 
Analysis :— 
0:2082 g. Sbst; 0:1411 g. AgCl. 
0°1998 g. Sbst; 12°3 ec. N (26°; 757 m.m.) 
C,, H,, NOC]. Cale Cl 16-6, N 6:6. 
Found Cl 16-8, N 6°8. 
It dissolves easily in alcohol or water, is scarcely soluble in 
ether, and reduces hot Fehling’s solution, giving the characteristic 
odour of pyrazine. In later preparations, it was found more con- 
venient to filter off the tin double salt, to dissolve in a little hot 
water, precipitate the tin as disulohide and evaporate directly on 
water-bath. The yield was about 40 p. c. theory. 
The tin double salt, (C\,;H,,NO), H.SnCl, is colourless, turns 
brown easily on exposure to air, melts at 177-178° C. 
03110 g. Sbst : 0:0690 g. SnO,. 
C..H,.N.O, SnCl, requires Sn 17°1 p.c. 
Found 17-4 p.e. 
The platinum double salt, (C1H,s;NO),H.PtCl,, is precipitated 
from its concentrated solution as yellow crystals melting at 187° C., 
and was dried at 100°C. for analysis. 
0:1200 g. Sbst : 0:0305 g. Pt. 
C..HN,0,PtC],. Calculated Pt 25-5. Found 25-4. 
