330
D. J. BELL
2. 3-O-Methyl'D-glucose
This sugar, which was one of the first partially methylated glucoses
ever to be prepared in the laboratory has been identified among the
hydrolytic products of the venom of a holothurian (26a).
3. 3-O-Meihyl-D-gdlactose
Hydrolyzates of the nonacidic portion of the mucilage of Ulmus
fulva contain 3-O-methyl-D-galactose (194a).
4. 6-0-Methyl-j>-galactose
Hydrolysis of polysaccharide material from the marine alga Porphyra
capensis yields, among other D- and L-galactose derivatives, the 6-methyl
ether (110).
5. 2-0-Methyl~i,-fucose
Recent work indicates that units derived from this ether of L-fucose
are quite widespread in material of plant origin. It has been isolated
from hemicelluloses from Victoria plum leaves (195) and from pectins
of sugar beet (195a) and sisal (195b); evidence of its presence in the
yew (Taxus cuspidata) has also been obtained.
6. 2-O-Methyl-D-xylose
This sugar occurs, along with 2-O-methyl-L-fucose, in plum leaf
hemicelluloses (195). Chromatographie evidence of its occurrence in
soil has also been obtained (196). It is quite widespread in plant
polysaccharides.
O. 3,6 ANHYDRO-L- AND -D-GALACTOSE UNITS IN ALGAL POLYSACCHARIDES
In 1938 Araki (196) and Hands and Peat (197) reported the detection among the hydrolysis products of agar (Gelidium spp.) of 3,6anhydro-L-galactose (LXXXIX). Forbes and E. G. V. Percival (198)
slightly later reported independent confirmation of the presence of this
hitherto unique internal sugar ether in agar in which L-galactose itself
had already been noted as a constituent. Araki and his co-workers have
HÖH
K
0
>HOH
OH
a I ß -3,6-Anhy dro- La / 0-3,6-Anhydro-D -
galactopyranose
galactopyranose
(LXXXIX)
(XC)
D. J. BELL
2. 3-O-Methyl'D-glucose
This sugar, which was one of the first partially methylated glucoses
ever to be prepared in the laboratory has been identified among the
hydrolytic products of the venom of a holothurian (26a).
3. 3-O-Meihyl-D-gdlactose
Hydrolyzates of the nonacidic portion of the mucilage of Ulmus
fulva contain 3-O-methyl-D-galactose (194a).
4. 6-0-Methyl-j>-galactose
Hydrolysis of polysaccharide material from the marine alga Porphyra
capensis yields, among other D- and L-galactose derivatives, the 6-methyl
ether (110).
5. 2-0-Methyl~i,-fucose
Recent work indicates that units derived from this ether of L-fucose
are quite widespread in material of plant origin. It has been isolated
from hemicelluloses from Victoria plum leaves (195) and from pectins
of sugar beet (195a) and sisal (195b); evidence of its presence in the
yew (Taxus cuspidata) has also been obtained.
6. 2-O-Methyl-D-xylose
This sugar occurs, along with 2-O-methyl-L-fucose, in plum leaf
hemicelluloses (195). Chromatographie evidence of its occurrence in
soil has also been obtained (196). It is quite widespread in plant
polysaccharides.
O. 3,6 ANHYDRO-L- AND -D-GALACTOSE UNITS IN ALGAL POLYSACCHARIDES
In 1938 Araki (196) and Hands and Peat (197) reported the detection among the hydrolysis products of agar (Gelidium spp.) of 3,6anhydro-L-galactose (LXXXIX). Forbes and E. G. V. Percival (198)
slightly later reported independent confirmation of the presence of this
hitherto unique internal sugar ether in agar in which L-galactose itself
had already been noted as a constituent. Araki and his co-workers have
HÖH
K
0
>HOH
OH
a I ß -3,6-Anhy dro- La / 0-3,6-Anhydro-D -
galactopyranose
galactopyranose
(LXXXIX)
(XC)