158
5 Carbohydrates
formed with configurational prefixes derived from Table 15 and stem
terms such as .•. heptose, ... octose etc., encoding chain length. The configurational prefixes are assigned according to the configurational patterns of the group of four stereogenic centers following C-l, ignoring
interposed non-stereogenic atoms.
HC=O
I
H:=i=:H} D-g/uco
H-C-OH
I
H-C-OH
I
H-C-OH D-g/ycero
I
CH20H
D-glycero-Dgluco-Heptose
HC=O
I
HO-C-H }
I
HO-C-H
I
D-manno
H-C-OH
I
H-C-OH
I
HO-C-H)
HO-?-H L-ribo
HO-C-H
I
CH 20H
L-ribo- D-mannoNonose
HC=O
I
H-C-OH
I
CH2
I
H-C-OH
I
L-ta/o
H-C-OH
I
CH2
I
HO-C-H
I
H-C-OH}
I
L-threo
HO-C-H
I
CH20H
3,6-Didesoxy-L- threoL- talo- Decose
Systematic names for dialdoses are constructed similarly, e.g.: L-threotetrodialdose, D-gluco-hexodialdose, etc.
S.2
Ketoses
In the case of ketoses too trivial names are still frequently preferred for the
fundamental types although systematic ... ulose names can easily be generated in a manner similar to that used for the systematic names of aldoses
(see Table 16).
Systematic names for higher ketoses are generated in the same way as
those for higher aldoses by combining stem terms such as ... hept-n-ulose,
... oct-n-ulose, etc. with the appropriate configurational prefixes taken
from Table 15 and again ignoring keto groups in position 3 and higher.