312 j Kremers—On the Classification of Carlton-Compounds. 
At the same time the glycol group is reduced to a primary 
alcohol group, while another molecule of acetic aldehyde, or 
rather ethy’ledene glycol, is oxidized to acetic acid, penta ery- 
CH,OH 
thrite resulting HOH 2 C-C-CH 2 OH. 
ch 2 oh 
The syntheses of the hexoses and of starch from formic alde¬ 
hyde also can be explained only by assuming the aldehyde 
group of formic aldehyde to be hydrated to a glycol group when 
condensation can take place: 
n/H 2 .OH 
IH 
C— H.OH 
SoSHj 
M . 
C-H.OH 
^ 16 — Hi 
iH:. ! 
C-H.OH 
S6-H; 
Mi .' 
C—H.OH 
SO—Hi 
Ih;.' 
-h ; o -h 
i— h 
1. CHo.OH 
2 . CH.OH 
I 
3. CH.OH 
= 6H 2 0-f 
CH.OH 
5 . CH.OH 
-O 
^O 
Aldose. 
By splitting off water in a slightly different manner the two 
ketoses may result: 
CHoOH. CHOH. CHOH. CHOH. CO. CH*OH. or 
CH„OH. CHOH. CHOH. CO. CHOH. CH 2 OH. 
1 . 2 . 3 . 4 - 5 . 6 . 
However, to return to the hydroxy derivatives of methane, it 
will be apparent that by splitting off water from the formulas 
already deduced the following anhydrides or partial anhydrides 
will result: 
0—H 
jO— Hi 
O-Hi 
iO-H 
Sh 
c^o-S 
c^o-7 H 
Sg 
S-H 
^O-H 
H 
H 
H 
0—H 
^0 
^0 
C-H 
C-O-H 
C — °!-H 
\H 
\H 
So— H 
