Biology Reference
In-Depth Information
m-DOG
-type linked oligomers. Eucalbanin C (
vide infra
) is a dimer
having a
p
-DOG
linking unit (Yoshida
et al
., 1992c).
In a D(OG)
2
-type linking unit, found in a smaller number of
oligomers, two hydroxyl groups of an HHDP group engaged their
oxygen atoms in diaryl ether bonds, as exemplified in oenothein A and
woodfordin D from
Woodfordia fruticosa
(Yoshida
et al.
, 1991a) (see
Section 1.3.5).
HO
OH
HO
O
HO
OH
HO
HO
OH
HO
OH
HO
OH
p
O
m
HO
OH
HO
O
OH
O
O
O
O
O
m
-DOG (valoneoyl) group
p
-DOG (tergalloyl) group
HO
OH
HO
O
O
OH
HO
HO
HO
OH
p
m
HO
O
OH
O
O
OH
HO
O
HO
m,p
-D(OG)
2
O
HO
OH
HO
OH
HO
OH
HO
O
OH
HO
OH
O
O
O
HO
O
OH
HO
OH
HO
HO
OH
HO
OH
m
"
m
HO
O
O
OH
O
O
O
O
m,m"
-D(OG)
2
