CARBOHYDRATES 



37 



studies of the chemical constitution of the various carbohydrates. 

 There is, of course, no thought that the printed formulas here pre- 

 sented accurately represent the actual relationships in space of the 

 different groups; but there is fairly conclusive evidence that the 

 variations in special groupings in the different sugars are properly 

 referable to the particular asymmetric carbon atoms as indicated 

 in the several formulas as presented. 



1. Aldohexoses of the mannitol series: 



d-Mannose 

 CH 2 OH 



H C OH 



/-Mannose 

 CH 2 OH 



HO C H 

 H C OH HO C H 

 HO C H H C OH 

 HO C H 



CHO 



d-Idose 

 CH 2 OH 



I 



H C OH 



CHO 



Wdose 

 CH 2 OH 



HO C H H C OH 



H C OH HO C H 

 HO C H 



H C OH 

 CHO 



d-Allose 

 CH 2 OH 



H C OH 



H C OH 

 HO C H 



CHO 



Z-AUose 

 (unknown) 



CH 2 OH 

 HO C H 



H C OH HO C H 



4-H 



H C OH HO 

 H C OH HO C H 

 CHO CHO 



