2 Homometallic Alkoxides

200 Alkoxo and Aryloxo Derivatives of Metals
⊲F⊳CAl⊲OPr i ⊳3
⊲G⊳,⊲H⊳,⊲I⊳C2Al⊲OPr i ⊳3
benzene
!fAl⊲OPr i ⊳2gfSb[⊲OC2H4⊳2NH]2gCPr i OH " ⊲3.104⊳
benzene
!fAl⊲OPr i ⊳2g2fM[⊲OC2H4⊳2NH]3g
(G 0 ), (H 0 ), (I 0 )
C2Pr i OH " ⊲3.105⊳
In contrast to insoluble products (E) to(I), the heterobimetallic products (E 0 )to(I 0 )
are soluble colourless monomeric products. 173
2.6 Synthesis of Heterometallic Triethanolaminate (tea) Alkoxide
Derivatives
The reactions of isopropoxides of alkaline earth metals (M D Ca, Sr, Ba) with
(HOC2H4⊳3N(H3tea) in 1:2 molar ratio yield colourless insoluble nonvolatile solids
(J) with the composition, M⊲H2tea⊳2, which on treatment with 4 moles of Al⊲OPr i ⊳3
afford 173 soluble monomeric heterobimetallic triethanolaminate products (K) according
to Eqs (3.106) and (3.107):
M⊲OPr i ⊳2 C 2H3tea benzene
! M⊲H2tea⊳2 # C 2Pr
(J)
i OH " ⊲3.106⊳
⊲J⊳ C 4Al⊲OPr i ⊳3
benzene
! [fAl⊲OPri⊳2g4fM⊲tea⊳2g] C 4Pr
(K)
i OH " ⊲3.107⊳
Triethanolaminates of Al, Sb(III) andSn(IV) have also been prepared 174 by the reactions
shown in Eqs (3.108)–(3.112):
M 0 ⊲OPr i ⊳3 C 2H3tea benzene
! M0⊲H2tea⊳⊲Htea⊳ #C3PriOH "
(O), (P) Colourless insoluble solid
where M0 D Al, Sb.
Sn⊲OPr i ⊳4.Pr i OH C 2H3tea benzene
! Sn⊲Htea⊳2 C 5PriOH "
(Q) Insoluble solid
⊲O⊳ C 3Nb⊲OPr i ⊳5
⊲P⊳ C 3Al⊲OPr i ⊳3
benzene
! [fNb⊲OPr i ⊳4g3fAl⊲tea⊳2g] C 3Pr i OH "
Soluble, monomeric solid
benzene
! [fAl⊲OPr i ⊳2g3fSb⊲tea⊳2g] C 3Pr i OH "
Soluble, monomeric solid
⊲3.108⊳
⊲3.109⊳
⊲3.110⊳
⊲3.111⊳
⊲Q⊳ C 2Al⊲OPr i ⊳3 ! [fAl⊲OPri⊳2g2fSn⊲tea⊳2g] C 2PriOH "
Soluble, monomeric solid
⊲3.112⊳
A number of bimetallic titanium and zirconium (M0 ) derivatives with aluminium
and niobium have been synthesized43,165,167,168 by the stepwise reactions shown in
Eqs (3.113)–(3.115):
M 0 ⊲OPr i ⊳4 C 2H3tea ! M 0 ⊲Htea⊳2 C 4Pr i OH "
(T), (U) Insoluble solids
⊲3.113⊳