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Notes 5255 not proceed by the primary mechanism alone. Drops of diethyl phthalate have been identified in the decomposition apparatus, which suggests dissociation according to equation 7 ZrCl4-C«H4(COOC2H5)2-> ZrCh + CelLCCOOCiHsh (7)It is possible that the ethylene results from the decomposition of the ester, as reported for ethyl benzoate.1 2345 *If this is so, the phthalic acid, resulting from equation 8, would react with any free metal tetrachloride to give hydrogen chloride.C6H4(COOC2H5)2 ->-C6H4(COOH)2 + C,H4 (8) ZrCl4 + C,H4(COOH)2 -*-ZrCl2(OOC)2CtH4 + 2HC1 (9) In the zirconium case only, trace quantities of phthalic anhydride were identified among the decomposition products.Acknowledgment.-This work was supported in part by the U. S. Atomic Energy Commission under Contract No. AT-(40-l)-234.