2 Homometallic Alkoxides

680 Alkoxo and Aryloxo Derivatives of Metals
esters by transesterification of ethyl acetate with the appropriate alcohol. 113 A titanium
isopropoxide chiral Schiff-base complex has been reported to catalyse a novel
enantioselective reaction of diketene with aldehydes to give 5-hydroxy-3-oxoesters. 114
Chiral titanium complexes obtained from the reaction of TiCl2⊲OPr i ⊳2 with various
chiral diols have been used in a variety of reactions such as the asymmetric Diels–Alder
reaction. 115
Lanthanum alkoxides have been used in the catalysed transhydrocyanation from
acetone cyanohydrin to other aldehydes or ketones and also in the reactions of silyl
ketene acetals with aldehydes. 116
5 MISCELLANEOUS APPLICATIONS
In the book on Metal alkoxides 117 some other industrial applications of metal
alkoxides were described, such as heat-resisting paints, protective coatings, waterrepellent
agents, and drying agents for inks and paints. Since 1978 many similar
reports have appeared, mainly in the patent literature, and a few examples of more
recent references will be given here. A review on corrosion prevention discusses the
merits of metal alkoxide formulations versus chromate treatments. 118 Heat-resistant
electrical wire insulation, 119 cross-linking of epoxy resins, 120 remedial treatment of
concrete, 121 fireproofing of wood, 122 and weather-proofing of decorative panels 123 are
also featured in the literature. Other applications involve dental fillings, 124 aluminium
soap greases, 125 laser recording media, 126 and a wide range of ceramic formulations
based on aluminium nitride, 127 aluminium oxynitride, 128 silicon carbide, 129 silicon
nitride, 130 titanium carbide, and titanium nitride. 131
These examples demonstrate the ubiquitous nature of metal alkoxides.
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