Chemistry Reference
In-Depth Information
Homometallic glycolates of alkaline earth metals (M) have been prepared
169
by the
routes shown in Eqs (3.90) - (3.92):
H
O
OH
O
toluene
+
H
2
↑
M
+
2G
G
M
G
OH
O
O
(3.90)
H
(A)
Colourless, soluble, monomeric solid
O
OH
O
benzene
M(OPr
i
)
2
2Pr
i
OH
↑
+
2G
G
M
G
+
(3.91)
OH
O
O
H
(A)
A
C 2Al
OPr
i
3
! [fAl
OPr
i
2
g
2
M
OGO
2
] C 2Pr
i
OH "
(
B
)
Colourless, soluble, monomeric solid
(3.92)
Heterobimetallic glycolate alkoxides of alkaline earth metals (M) can also be pre-
pared by the reactions shown in Eqs (3.93) and (3.94):
OH
benzene
[M{(m-OPr
i
)
2
Al(OPr
i
)
2
}
2
]
[M{ m-OPr
i
)
4Pr
i
OH
+
2G
2
Al(OGO)}
2
]
+
↑
OH
(C)
3
.
93
OH
benzene
M{Al(OPr
i
)
4
}
2
8Pr
i
OH
+
4G
M{Al(OGO)
2
}
2
+
↑
(3.94)
OH
(D)
All the products (
A
), (
B
), (
C
), and (
D
) are colourless, monomeric soluble, nonvolatile
solids which do not yield by disproportionation any Al
OPr
i
3
,when(
B
)and(
C
)are
heated under reduced pressure.
The reactions of Zr
2
OCMe
2
CMe
2
O
2
OCMe
2
CMe
2
OH
4
with Ti
OPr
i
4
in 1:1 and
1:2 molar reactions have been shown
170
to yield Ti:Zr
2
and Ti:Zr heterobimetallic
crystalline products (characterized by X-ray crystallography) according to Eqs (3.95)
and (3.96):
Zr
2
OCMe
2
CMe
2
O
2
OCMe
2
CMe
2
OH
4
C Ti
OPr
i
4
THF
!
-2Pr
i
OH
[TiZr
2
OCMe
2
CMe
2
O
4
OCMe
2
CMe
2
OH
2
OPr
i
2
]
3
.
95
Zr
2
OCMe
2
CMe
2
O
2
OCMe
2
CMe
2
OH
4
C 2Ti
OPr
i
4
THF
!
-4Pr
i
OH
[Ti
2
Zr
2
OCMe
2
CMe
2
O
6
OPr
i
4
]
3
.
96
