Zirconium organic derivatives

In the case of organic derivatives such as zirconium acetate, direct bonding of the carboxyiate to the zirconium is found. Similar structures are also found in solvent-soluble, water-insoluble carboxylates such as zirconium propionate. Zirconium alkoxide derivatives tend to be monomeric in solvent-based systems but hydrolyse rapidly with ambient water to give polymeric species. 

The development of organic derivatives of zirconium phosphate has led to wide interest in other examples of layered metal organophosphonates. For example, VO +, M +, and M + phases have been synthesized with a variety of different layer connectivities and interlayer chemistry. ... 

USE Friedel-Crafts catalyst- Component of Ziegler-type catalysis in the condensation of ethylene. Starting material in the synthesis of a number of organic derivs of zirconium, such as alkoxides and zircocene. The alkoxides have been shown to be of value in the curing of silicone plastic films. The alkoxyzirconium carboxylates are said to be useful in the water-repellent treatment of textiles and other fibrous materials. Review Blumenthal, J. Chem. Ed. 39, 604-610 (1962). 

Figure 15 A schematic structural model of the organic derivatives of y-zirconium phosphate. (From Ref. 82c.)...

PREPARATION AND PROPERTIES OF THE LAYERED ORGANIC DERIVATIVES OF Y-ZIRCONIUM PHOSPHATE, Zr (CH3-(OCH2CH2)n"OP03) (HPO4) (n=l-3)... 

The reaction proceeds topochemically by a diffusion process and the resulting organic derivatives retain the original layer structure of y-zirconium phosphate. Such exchange reactions enable us to tailor the interlayer surfaces of y-zirconium phosphate systematically. A schematic structural model of the organic derivatives is shown in Figure 2. 

In the present study, exchanges have been carried out by using phosphoric acid esters having oxyethylene chains, CH -(OCH CH ) -OPO H (n=l-3). It has been found that the resulting organic derivatives or y-zirconium phosphate behave like crown ethers, forming complexes with various alkali thiocyanates and iodides. 

Figure 5. It is likely that the intercalated alkali cations are surrounded by ethereal oxygen atoms like the cations in crown ethers, the iodine and thiocyanate anions being associated with the cations. It is interesting to note that the organic derivatives of y-zirconium phosphate synthesized in this study can form the complexes only with the alkali salts having soft base anions such as I and SCN , but not with the salts having hard base anions such as Br and N03 .

While there have been many attempts to find alternatives to the organosilanes, these have had limited success. The main competitive products are based on organic derivatives of titanium, aluminum, or zirconium but have only achieved niche use. 

As was discussed for silicon precursors (Figure 1.2), closed structures (oxo clusters) can be formed as well by the condensation reactions, and the same remarks apply with regard to their importance in sol-gel processes. Figure 1.8 shows an example of a cluster obtained by hydrolysis of an organically substituted zirconium alkoxide derivative. 

Section 14 15 Coordination polymerization of ethylene and propene has the biggest eco nomic impact of any organic chemical process Ziegler-Natta polymer ization IS carried out using catalysts derived from transition metals such as titanium and zirconium tt Bonded and ct bonded organometallic com pounds are intermediates m coordination polymerization... 

D. Seebach, B. Weidmann, L. Widler in Titanium and Zirconium Derivatives in Organic Synthesis in Modern Synthetic Methods, R. Scheffold, Ed., pp 217-353, Salle und Sauerlander, Frankfurt 1983. 

The migration of organic groups on metals to a-halogenated groups has been developed by Negishi and used by Whitby in zirconium chemistry [51], A similar type of migration in the case of zirconacyclopentadienes is also possible, as shown in Eq. 2.72, which affords zirconacyclohexadiene derivatives [52]. 

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