Group 11 fluoroalkoxides

Tellurium tetrakis[fluoroalkoxides] reacted with tellurium tetrahalides in benzene or tetrahydrofuran to yield fluoroalkoxy tellurium halides with one, two, or three flu-oroalkoxy groups in the molecule depending on the molar ratio of the reagents2. 

Tellurium tetrakis[fluoroalkoxides] and tellurium tetrachloride reacted in refluxing benzene or tetrahydrofuran to produce fluoroalkoxy tellurium chlorides. The number of alkoxy groups in the product molecules is determined by the molar ratio of the reagents2. 

Polydichlorophosphazene is a highly reactive polymer. The chlorine atoms can be replaced by a great variety of side groups leading to different polyorganophosphazenes aryloxy, fluoroalkoxide, etc. symmetrically or unsymmetrically substituted. The physical properties strongly depend on the nature of various substituents. 

Polymers with different groups attached to the phosphorus atom can be obtained from phosphazene cyclic trimers or tetramers with mixed halogen and alkyl or aryl side groups by a similar procedure. Further attachment of side groups, such as fluoroalcoxy, can be achieved by treatment of the polymer with excess of sodium fluoroalkoxides [2], By this procedure are obtained, for example, poiy fluoroaikoxyphosphazenes) with the structure shown below ... 

Out of the two groups (fluoro and chloro) of title compounds so far studied, the chemistry of fluoroalkoxides (24, 160, 303-305) and fluoro-/3-diketonates (146, 306-309) has recently attracted considerable attention, mainly due to their enhanced volatility compared with the unfluorinated analogues. Another interesting feature of fluoroalkoxide derivatives in their role as an effective alkene and acetylene metathesis (160). 

X-ray crystallographic studies also helped to demonstrate that oligomeric species containing both the fluoroalkoxide and nonfluorinated alkoxide components prefer to bridge through the latter group (Fig. 48). 

Alkaline earth and REfluoroalkoxides ([M(OR) ], where M = metal elements and OR = fluoroalkoxo groups) were examined as precursors for metal fluorides in the sol-gel process (Poncelet, 1998 Chi, 2002). Such fluoroalkoxides were prepared by the reaction of polyether-substituted flouroalcohols with metal source reagents, Sr(OC3H7)2 orBaH2. It was possible to obtain pure metal fluoride powders by hydrolysis or pyrolysis of the precursors. 

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