318 Kremers—On the Classification of Carhon-Compounds. 
The amines in a certain way correspond to the alcohols, and 
are capable of yielding corresponding alcohols through the 
diazo reaction: 
R'Cn 3 N;H;+0]N.0H = R'.CH 2 .N : N0K-fH 2 0. 
R'.CH,. ;N":"N"".7 OII = R'. CII 2 O H+N 2 . 
The valency of the amido group is equivalent to that of the 
hydroxy group, namely, one. 
The imines correspond to aldehydes and ketones. Their de¬ 
rivatives can be obtained by condensation of aldehydes with 
substituted ammonias, e. g.: 
H—C: 
/H 
-H 
^0±H,jNC 6 H 5 = H-C^x. C 6 H 5 . 
On the other hand, imido groups upon hydrolysi are con¬ 
verted into keto groups, e. g.: 
NH,C=NH 
“ I 
N 
.(N0 3 H) 2 +2H 2 0 = 
N 
I 
NH,C=0 
N 
I 
nh 2 c=nh 
nh 2 c=o 
I 
N 
+2NH 4 N0 3 . 
This interesting reaction takes place upon boiling the aque¬ 
ous solution of the nitrate of the base (Thiele, Ann. 270, p. 7). 
As far as equivalence of substitution is concerned, the tri¬ 
amines correspond to ortho-acids, the amidines to meta-acids. 
The amidines can be converted into meta acids by substitution 
of (O)" for (NH) ,; and of (OH)' for (NH 2 ),' e. g.: 
CH 0 C^J±I?j°= CH,(0 H!+NHl ; 
ch 8 c< 
+o 
N m H. 
h: 
= CHoC 
= CHoC: 
:8- h +nh s 
Reasoning from analogy points out no analogon among the 
oxygen derivatives for the nitrile. This is due to the different 
valencies of the oxygen and nitrogen atoms. However, since 
the nitrile is a de-ammoniated derivative of an amidine, or a 
corresponding tri-amine, like them it yields an acid upon 
hydrolysis. Like the acids the nitriles are tri-substitution 
