2 Homometallic Alkoxides

O
Mg Mg OAr
O
Metal Aryloxides 463
− 4Bun n H
(6.47)
MgBu 2 + 4ArOH
Me3C
where HOAr = HO CH3 .
Me 3C
CF 3
CF3
F3C O
F3C CF In
3
OH
CF3
O
F3C − 2CpH
In
2CpIn + 2
CF3
F3C ⊲6.48⊳
This method has been used to produce a variety of homoleptic aryloxide complexes
and has also been applied to the synthesis of mixed alkyl, aryloxide derivatives of
metals. Partial substitution is typically achieved by simple control of the stoichiometry
or by using sterically demanding aryloxides (Eqs 6.49, 133,134 6.50, 135 and 6.51136 ).
ArO
ArO
− 2PhCH3 M(CH2Ph) 4 + 2ArOH M
(6.49)
Me3C
where M = Ti, Zr, Hf; ArOH = HO .
Me 3C
ArO
Ar
Ar
CH2Ph
CH 2Ph
2Ga(CH3)3 + 2
N
−2CH4 H3C
H3C Ga
O
O
N
Ga CH3
CH3
(6.50)
OH
N
R
R
SiMe3
Ta Ta
SiMe 3
R
R
4ArOH
−4RH
ArO
ArO
SiMe3
Ta Ta
SiMe 3
OAr
OAr
(6.51)