No abstract

Iridium complexes were found to promote the conversion of allyl homoallyl ethers to gamma,delta-unsaturated carbonyl compounds. For example, treatment of 1-allyl-1-allyloxycyclohexane in the presence of catalytic amounts of [Ir(cod)Cl](2), PCy(3), and Cs(2)CO(3) in toluene at 100 degrees C afforded 4-cyclohexyliden-2, 3-dimethylbutanal in 74% yield. The reaction presumably proceeds through double bond migration to allyl vinyl ethers, which then undergo the Claisen rearrangement.

Two novel precursors, tetrakis(2-methyl-3-butene-2-oxy) hafnium (HMBO) and tetrakis(2-methyl-3-butene-2-oxy) zirconium (ZMBO), are synthesized for the deposition of hafnium dioxide (HfO 2 ) and zirconium dioxide (ZrO 2 ), respectively. HMBO and ZMBO have carbon-carbon double bond in their molecule, for ozone reactivity is added to themselves. Thermal stabilities of HMBO and ZMBO are more stabilized than those of TEMAH and TEMAZ. The effect of carbon-carbon double bond for the improvement of the O 3 reactivity with HMBO and ZMBO is confirmed by thermogravimetric analysis (TG) under O 3 atmosphere.

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