With Replacement of Two Fluoroalkoxy Groups

Heating tris[fluoroalkoxy] tellurium fluorides with 4-methylbenzenesulfonamide at 110°/0.04 torr caused fluoroalkoxy (4-methylbenzenesulfonimido) tellurium fluorides to form.  

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With Replacement of two Fluorine Atoms and two Fluoroalkoxy Groups... 

The first polyphosphazenes to be developed commercially were polymers with two different types of fluoroalkoxy side groups attached to the same chain.142 145a A typical example is shown in 3.73. Polymer 3.73 has a more complicated structure than is implied by the illustration. The polymer is synthesized by the reaction of a mixture of CF3CH2ONa and CFB CFj CHjONa with poly(dichlorophosphazene). This means that the two nucleophiles compete for replacement of the available chlorine atoms, a process that could lead to a random distribution of side groups, but could also generate repeating units in which the phosphorus atoms bear two of the same side groups. 

Fluoroalkoxy tellurium chlorides react with N-trimethylsilylmorpholine in diethyl ether at 5° with preferential replacement of fluoroalkoxy groups. Only two morpholino groups can be introduced into the molecules, even when an excess of the amine is used1. 

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