Chemistry Reference
In-Depth Information
HO
O
O
OH
O
O
+
O
HO
n
OH
R
R
n
Fe-salen, H
2
O
2
pyridine
Hybrid polymer
N
0
-ethylene bis(sallicylidene amine) as
well as a horseradish peroxidase enzyme to carry out oxidative coupling of phenols using hydrogen
peroxide as an oxidizing agent. The product is a new type of plastic.
The reaction was catalyzed by a complex of iron with
N
,
8.2.4 Miscellaneous Polysaccharides
Other polysaccharides found in nature include
alginic acid
that is isolated from certain brown
seaweeds [
17
]. The monomers of this polymer, similar to cellulose, are linked
trans
or
to each
b
other, through the 1,4 positions:
OH
HO
O
O
O
OH
A sulfate group bearing polysaccharide is isolated from another seaweed that is red in color.
This polymer is called
carrageenan.
It consists of two fractions [
17
]. The first one has the galactose
units linked though 1 and 3 or 1 and 4 carbons. A sulfate group is found at carbon 2 on some units:
SO
3
O
HO
OO
n
CH
2
OH
