Chemistry Reference
In-Depth Information
Br
Br
Br
Br
O
Br
Br
Br
Br
Br
Br
Br
Br
Br
Br
Br
Br
Br
Br
Br
Br
Decabromodiphenyl ether
Decabromodiphenylethane
Br
O
O
Br
Br
Br
Br
N
N
HO
OH
Br
Br
O
O
Br
Br
Br
Br
Br
Ethylene bis-tetrabromophthalimide
Tetrabromobisphenol A
Decabromodiphenyl ether is being phased out because of concerns about
the effect on human health and the environment. There is also a concern that
under some waste incineration conditions that might be used for discarded
plastics, it can be converted to polybrominated dioxins which bear a structural
similarity to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).
Br
Br
Br
O
Br
Cl
O
Cl
Br
O
Br
Cl
O
Cl
Br
Br
A polybrominated dioxin
TCDD
One chlorinated flame retardant that is useful for high processing polymers
such as nylon is Dechlorane Plus
®
. This has good thermal stability and is not
prone to dehydrochlorination because the reaction would involve formation
of double bonds at bridgehead carbons.
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Dechlorane plus
®
Antimony oxide is prepared from naturally occurring stibnite ore. Stibnite
is Sb
2
S
3
. The antimony ore (stibnite) is roasted to vaporize the stibnite which
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