Chemistry Reference
In-Depth Information
The starting materials were low and medium molecular weight copolymers. Infra-red spectra of
the products from the Schmidt reaction show a high degree of conversion [
129
]. The yields of the
oximes and subsequent Beckmann rearrangements are also high.
A Schmidt reaction on poly(
-acetyl styrene) yields a product containing acetyl amino styrene
groups in high yields and the products are surprisingly pure [
130
]. The solvent is acetic acid and the
converted material precipitates out as a sticky mass:
p
HN
3
H
2
SO
4
H
NH
NH
2
O
O
Another rearrangement reaction is isomerization of unsaturated polyesters upon heating. Thus, for
instance, maleate polyesters rearrange to the fumarate analogs at elevated temperatures [
131
]:
O
O
O
O
O
O
O
O
-stilbene moieties in the backbone can undergo
photocylization that is almost quantitative [
473
]:
It was reported that polymers with
cis
UV light
NBu
4
F
Δ
HCl
HO
