Chemistry Reference
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H
O
O
H
P
P
R
2
R
2
O
O
O
2
O
O
O
R
1
R
2
R
1
R
1
R
2
R
1
P
P
BF
3
.
EtO
2
UV
Scheme 4.32 Use of phospha-Michael addition to make bio-based polymers with improved flame-retardant properties.
72
OH
O
TBDMS
OH
O
H
O
O
TBDMS
(RO)
2
HPO
1% HCl in
Castor oil
(Lesquerella oil)
H
(RO)
2
P
(RO)
2
P
n
5
95% EtOH
n
5
NaOMe,
-40 °C, THF
n
5
O
O
Scheme 4.33 Use of the Abramov reaction to form castor- (n
¼
7) and lesquerella- (n
¼
9) based a-hydroxy phosphonates.
73,74
The reaction
was also carried out with FAs, where the C
¼
C bond had been saturated. TBDMS: tert-butyldimethylsilyl.
