Chemistry Reference
In-Depth Information
2.5
Synthesis of Heterometallic Diethanolaminate Alkoxide Derivatives
Similar to homometallic glycolates of alkaline earth metals (M D Mg, Ca, Sr, Ba),
diethanolaminates also can be prepared by dissolution of the metals or by reactions of
their isopropoxides with diethanolamine (Eqs 3.97 and 3.98):
toluene
! Mf
OC
2
H
4
HOC
2
H
4
NHg
2
#CH
2
"
M C 2HN
C
2
H
4
OH
2
3
.
97
M
OPr
i
2
C2HN
C
2
H
4
OH
2
! Mf
OC
2
H
4
HOC
2
H
4
NHg
2
#C2Pr
i
OH "
A
0
Colourless, insoluble solid
3
.
98
The colourless solids (
A
0
) differ from (
A
) (Section 2.4) in being insoluble in organic
solvents. However, on being reacted with Al
OPr
i
3
,
A
0
also yields
171
ahetero-
bimetallic diethanolaminate product (
B
0
) which is a colourless, soluble, monomeric
non-volatile solid (Eq. 3.99).
benzene
!fAl
OPr
i
2
g
2
Mf
OC
2
H
4
2
NHg
2
B
0
A
0
C 2Al
OPr
i
3
C 2Pr
i
OH "
3
.
99
Other colourless, soluble monomeric solids (
C
0
)and(
D
0
), with the compositions
MfAl
OPr
i
2
gf
OC
2
H
4
2
NHg
2
and MfAl
OC
2
H
4
NHC
2
H
4
O
2
g
2
, respectively, can also
be synthesized by reactions similar to those of Eqs (3.93) and (3.94).
Heterobimetallic diethanolaminate derivatives of a number of other metals have also
been synthesized
172
by similar reactions (Eqs 3.100 - 3.102):
M
OPr
i
3
C 2HN
C
2
H
4
OH
2
benzene
! Mf
OC
2
H
4
HOC
2
H
4
NHgf
OC
2
H
4
2
NHg#
(
E
), (
F
)
C 3Pr
i
OH "
3
.
100
where M D Al, Sb.
Ti
OPr
i
4
C 3HN
C
2
H
4
OH
2
benzene
! Tif
OC
2
H
4
2
NHgf
HOC
2
H
4
OC
2
H
4
NHg
2
#
(
G
)
C 4Pr
i
OH "
3
.
101
M
0
OPr
i
4
.
Pr
i
OH C 3HN
C
2
H
4
OH
2
benzene
! M
0
f
OC
2
H
4
2
NHgf
HOC
2
H
4
OC
2
H
4
NHg
2
#
(
H
), (
I
)
C 5Pr
i
OH "
3
.
102
where M
0
D Zr, Sn(
IV
).
The products (
E
), (
F
), (
G
), (
H
), and (
I
) are colourless, insoluble nonvolatile solids,
which can be converted into heterobimetallic soluble monomeric products by reactions
represented Eqs (3.103) - (3.105):
benzene
!fNb
OPr
i
4
gfAl[
OC
2
H
4
2
NH]
2
gCPr
i
OH "
E
CNb
OPr
i
5
3
.
103
