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In-Depth Information
Scheme 5.4
Preparation of W(NPh)(CHCMe
3
)(TMS
2
PDA)L (L=PMe
3
).
PDA=
o
-phenylene diamide.
cess of base such as trimethylphosphine or triethylphosphine at elevated tempera-
tures (Scheme 5.4).
W(NPh)(CHCMe
3
)(TMS
2
PDA)L (PDA=
o
-phenylenediamide, L=PMe
3
) also effec-
tively catalyzes the polymerization of NBE. Unfortunately, a non-stoichiometric ini-
tiation due to incomplete dissociation of the base was observed. Another tungsten-
based complex W(NPh)(CHSiMe
3
)(CH
2
SiMe
3
)(2-NMe
2
-CH
2
C
6
H
4
) may be prepared
Scheme 5.5
Synthesis of W(NPh)(CHSiMe
3
)(CH
2
SiMe
3
)(2-NMe
2
-CH
2
C
6
H
4
).
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