APPENDICES 



645 



NITROGEN-CO^fTAINING COMPOUNDS. 



Ammonia. — The three-handed Nitrogen by linking with three hydro- 

 gens forms Ammonia, 



H 



I 



H— X— H 



If one of these hydrogens is removed, Amidogen, — NH2, which can link 

 with other molecules, is produced. 



Amino Acids- — If one of the hydrogen atoms directly joined to 

 carbon in the radicle of an acid is replaced by amidogen, a mon-amino 

 acid is formed, thus : — 



H O 



H 



/>N— C- 



_C-0— H 



Amino acetic acid. 



H 



When two hydrogen atoms are thus replaced, a di-amino acid is produced — 

 NH„NH„ 



r r ii 



H — C — C — C — — H or, «, ^ ^ di-amino propionic acid. 

 H H 



Amines- — In these, NHg takes the place of OH of an alcohol ; or, looked 

 at in another way, they are formed from NH3, by replacement of hydrogen 

 atoms by alkyl groups. 



H H H H 



H— C— 0-H H 



H H 



Methyl alcohol. Ammonia. 



N =H— C— N Methyl-amine. 



I I I 



H H 



Di- and tri-amines may be formed thus — 



CH, 



CH3 



:NH Di-methvl amine. 



CH3 J^N Tri-methyl amine. 

 CH, 



1 The carbon atoms are named a, ^, and 7 from their position in relation- 

 ship to the carboxyl group. 



