2 Homometallic Alkoxides

OH
Monofunctional bidentate
HC N
R′
(R′ = alkyl or aryl)
O
HC H
N
HsalNR′
R
(a) (b)
R′
OH
C
(d)
Bifunctional tridentate
NR′′OH
(R′ = H or Me; R′′ = C 2H4, CH2CHMe)
Bifunctional tetradentate
N N
B
(f)
Homometallic Alkoxides 129
R′
O
H H
N
R′′ R′′′
(R′ = R′′ = Me, But , Ph, CF3
R′, R′′ = Me, CF3; Me, Ph;
R′′′ = alkyl or aryl)
(c)
(R′ = H or Me)
(e)
(B = CH 2CH 2(salen H 2), CH 2CHMe
(salpnH 2), o-C6H4 (salphen H2))
R′
R′′
OH
HC
O
N
H H
B
(R′ = R′′ = Me, Bu t , Ph, CF3;
R′, R′′ = Me, CF3; Me, Ph;
B = CH2CH2, CH2CHMe, C6H4)
(g)
R′
OH
CH
O
N
OH HO
C N
Figure 2.15 Some of the types of mono- and bi-functional bi- and
tri-dentate Schiff bases and ˇ-ketoamines whose reactions with metal
alkoxides have been investigated.
Another noteworthy feature is that homoleptic derivatives of a wide variety of monofunctional
bidentate Schiff bases and ˇ-ketoamines with a number of metals (Nb, Ta,
Al, Sb) may be prepared by the alkoxide route. However, attempted preparations of
analogous derivatives of Ti and Zr have not been successful.
R′
R′′