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Fig. 2.14
Synthesis of the P
N ligands
10a
,
b
as well as of the corresponding palladium com-
plexes
11a-d
(see text for
11c
).
plexes consist of a pyridine and a bis(2-methyl)phenyl substituted phosphane
(
10a
) and of an imine and a diphenylphosphane unit (
10b
) [43]. The correspond-
ing palladium complexes are used to examine their catalytic properties (Fig. 2.14).
2.4.1
Synthesis and Characterization
The P
N ligands
10a
,
b
as well as the corresponding palladium complexes were
synthesized as depicted in Fig. 2.14. Treatment of 2-(chloromethyl)pyridine with
one equivalent of bis(2-methylphenyl)phosphane in the presence of potassium
tert
-butylate yielded ligand
10a
which was directly converted into the palladium
diiodide complex
11b
. Purification of
11b
was achieved by column chromatogra-
phy on silica.
The free ligand
10a
was regenerated by treating
11b
with an access of potas-
sium cyanide. Reaction of
10a
with CODPdClMe afforded the chloromethyl palla-
dium complex
11a
. In square planar P
N chloromethyl palladium complexes two
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