2000 cleavage reactions, decomposition reactions, pyrolysis cleavage reactions, decomposition reactions, pyrolysis O 0100 06 -041 ZrCl 4 -Catalyzed Scission of Ethylene Acetals with Organoaluminum Compounds. -Ethylene acetals and ketals (I) undergo reductive cleavage under the action of organoaluminum compounds in the presence of catalytic amounts of ZrCl 4 . With iBu 3 Al and Et 3 Al, reduction of the initial dioxolanes is accompanied by reductive alkylation. -(VOSTRIKOVA, O. S.; GAFAROVA, YU. T.; DOKICHEV, V. A.; ZLOTSKII, S. S.; Russ.