292 CHEMISTRY OF THE PTOMAINS. 



This bromin compound is formed in the synthesis of neurin out 

 of trimethylamin and ethylene bromid. It melts at 230°, is soluble 

 in water and in hot alcohol and forms stellate masses of small plates 

 or prisms. With freshly precipitated silver ozid, according to 

 equation 2, it yields neurin. 



Hypochlorous acid, likewise, breaks up the vinyl group in neurin 

 to form a derivative of cholin, which with silver oxid yields iso- 

 muscarin (Bode). 



It decomposes readily on standing, more rapidly on heating into 

 trimethylamin. 



The chlorid, CjHjjN.Cl, is extremely poisonous and crystallizes in 

 fine hygroscopic needles. It is easily soluble in water and alcohol. 

 By the action of hypochlorous acid it is changed to iso-muscarin. 

 For behavior to alkaloidal reagents, see Table I.; also Gulewitsch. 



The bromid, Br.N(CHj)3.CjH3, is colorless, wart-like in form, 

 hygroscopic and easily soluble in water and in alcohol, insoluble in 

 ether. It melts at 193° (Bode). 



The iodid, IN(CH3)3.C2H3, forms colorless, permanent needles; 

 easily soluble in water ; slightly in cold alcohol, easily in hot alco- 

 hol. When heated to 180° it becomes yellow, and at 196° it melts 

 (Bode). 



The picrate forms feathery, gold-yellow, long needles which when 

 heated rapidly melt with decomposition at 263°-264°. At 23° 

 the solubility in water is 1:91.6. On heating it dissolves more 

 readily in water and in alcohol (Gulewitsch). 



The platinochlorid, (C5HjyN.Ci)3PtCl^ (Pt= 33.60 per cent.), is 

 difficultly soluble in hot water, and crystallizes in beautiful, well 

 formed, small octahedra belonging to the regular system. The 

 crystals are always single. No twin crystals are observed. Some- 

 times the crystals contain water of crystallization, at other times 

 they do not (Brieger, I., 33). It melts at 211°-213° (Schmidt); 

 213°-214° (Bode) ; with decomposition at 195.5-198° (Gulewitsch). 

 According to Liebreich, it forms from an aqueous solution in five- 

 or six-sided, heaped-up plates resembling urea nitrate, while from 

 an alcoholic solution it forms needles which on exposure to air be- 

 come opaque and are partially converted into the oxyethyl base — 

 cholin. The six-sided plates are rarely met with and readily show 

 an octahedral relation (Gulewitsch). The difficult solubility (at 

 20.5° it is 1 : 37.6 part of water), octahedral form, always single, 

 and the melting-point distinguish it perfectly from the cholin salt. 



The aurochlorid, CsHjjN.CI.AuClj (Au = 46.37 per cent.), forms 

 a yellow cheesy precipitate which on recrystallization yields flat 

 prisms which are difficultly soluble in hot water (Brieger). At 

 21.6° it dissolves in 336.5 parts of water (Gulewitsch). Dissolves 

 easily, and can be purified by crystallization (Liebreich). It melts 

 at 228°- 232° (Gulewitsch); 238°- 239° (Klein). 



