Chemistry Reference
In-Depth Information
Beyond the above, there are many other polyester syntheses that can be found in the literature, but
are not in common use. For instance, polyesters form from additions of carboxylic acids to divinyl
ethers [
29
]:
O
R
O
+
O
O
n
n
R'
OH
OH
O
O
R'
R
O
O
O
O
n
Polyesters also form by the Tischenko reaction from dialdehydes [
26
,
27
]. The intramolecular
hydride transfer reaction is typically catalyzed by bases:
O
C
4
H
9
Li
O
R
O
O
R
n
Another reported procedure consists of condensations of nitriles with glycols. The resultant poly
(iminoether hydroxide)s hydrolyze to polyesters [
32
].
NH
2
Cl
NH
2
Cl
HCl
R
R'
R'
+
n
NC
CN
n
HO
OH
R
O
O
n
O
O
H
2
O
R'
R
O
O
n
Carbon suboxide condenses with glycols to form polyesters [
26
]:
O
O
R
O
O
R
+
n
n
HO
OH
O
O
n
Also, an alternating free-radical addition copolymerization of cyclohexene and formic acid,
perhaps via charge transfer, donor-acceptor complexes, yields polyesters [
30
]:
O
O
I
2
n
+
n
n
COOH
ROOH
Cyclic carbonates, oxalates, and glycolates polymerize by ring opening polymerizations to yield
polyesters. An example is a conversion of a cyclic carbonate into a low molecular weight polymer
(about 4,000) [
39
,
40
]:
