Chemistry Reference
In-Depth Information
4. Although not practical commercially, polyesters can be prepared in the laboratory by reacting
aliphatic dibromides with silver salts of dibasic acids [
6
]:
O
O
O
O
R'
R'
+
Ag
Ag
Br
Br
O
R
O
O
R
O
n
5. Polyesters also form from reactions of dicarboxylic acid anhydrides with glycols [
10
]:
O
R
O
O
n
+
O
n
HO
OH
R
n
O
O
O
6. Glycol carbonates undergo ester interchange reactions with dibasic acids [
11
]:
O
O
R
O
n
+
O
n
OH
OH
O
O
O
+
O
O
R
n H
2
CO
3
2
n
7. Ester interchange reactions between glycol acetates [
12
,
13
] or diphenol diacetates [
12
] and
dicarboxylic acids:
O
O
R
O
+
O
n
n
O
OH
OH
O
O
R
O
O
+
n
O
R
n
OH
8. Acid chlorides react with diphenols to form polyesters. The reaction is quite efficient when
scavenger of HCl is added to the aqueous phase. Such scavengers can be tertiary amines [
15
]:
O
O
O
R
O
R'
R'
+
n HCl
n
n
+
HO
OH
R
O
O
n
Cl
Cl
