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O
HO
B
-
[Pd
II
R(X)L
n
]
Boronate
O
Z
Direct
Transmetallation
O
[Pd
II
R(OH)L
n
]
Oxo-palladium
R
B
O
Z
Z
Prior Activation
H
2
O
[Pd
II
R(OH)L
n
]
Oxo-palladium
[Pd
II
R(X)L
n
]
Boronate
OH
O
OH
OH
HO
B
-
B
B
OH
OH
OH
Z
Z
Z
Scheme 8.24 Possible transmetallation mechanisms for the coupling of an arylpinacolboronic ester.
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