( 628 ) 
With methyl chloro-formate and sodium car- CH _NH 
bonate in aquous solution, aminopropylene ureine | RU 
hydrochloride yields a carboxymethyl derivative CO 
(a urethane), which, when recrystallised from C-——NH 
alcohol, forms glittering leaflets, which melt | 
at 238° with decomposition. From this was CH,. NH. CO, CH, 
prepared, by five minutes boiling with acetic anhydride, a monoacetyl 
derivative which erystallises from ethyl acetate in splendid needles, 
melts at 215°, and is decomposed when heated a trifle above that 
temperature. 
A diacetyl derivative was obtained by boiling for an hour with acetie 
anhydride ; this yields also splendid needles and melts at 125°—126°, 
The two acetyl groups will, therefore, most probably be attached 
to the nitrogen atoms of the ureine, and no acetyl has arrived at 
the urethane function. 
The corresponding carborethyl derivative was also prepared ; this 
erystallises from boiling alcohol in small very glittering crystals melting 
at 208°. In the same manner as in the case of carboxymethyl] 
derivative, a monoacelyl compound was obtained therefrom, which 
erystallises from acetic acid in beautiful, silky needles, melting at 
218°— 219°, and also a diacetyl compound, melting at 101°—102". 
Ureopropyleneureïne was obtained, not only from diaminoacetone 
hydrochloride with two mols. of potassium isocyanate in aqueous 
solution, but also from aminopropyleneureine hydrochloride with one 
mol. of isocyanate. When crystallised from boiling water (it is but 
little soluble in cold water), it forms snow-white leaflets, which have 
no melting point, but are decomposed with change of colour at a 
little over 220°. It is soluble without decomposition in boiling acetic 
acid, and in this solvent the molecular weight was determined. 
In aqueous solutions it gives no precipitates with silver nitrate and 
mercuric chloride unless ammonia is added, but it is precipitated by 
mereuric nitrate and therefore, behaves in this respect like urea. 
On being boiled with acetic anhydride the bulk remained at first 
unaltered and it took ten ‘hours to effect the change. The tetracetyl 
compound of aminopropyleneureine was thus obtained and recognised 
by its form and melting point: the urea residue has, therefore, been 
broken up. 
Finally, it should be en that diacetylaminoacetone is also 
converted on prolonged boiling with an excess of acetic anhydride 
into tetracetyldiaminoacetone. When erystallised from boiling benzene, 
or from aleohol, it forms long, very lustrous needles which cake at 
98° and melt at 108°. 
