Through Reactions with Organometallic Compounds

Aryl tellurium trichlorides are easily converted to symmetrical or unsymmetrical diaryl tellurium dihalides via reactions with organometallic compounds (see p. 549). Trimethyl(aryl)silanes transfer only the aryl group to tellurium  

Aryl tellurium trichlorides and equimolar amounts of chlorotriphenylstannane produce in refluxing toluene aryl phenyl tellurium dichlorides Tetraphenyl tin and phenyl tellurium trichloride yielded diphenyl tellurium dichloride.  

Similar reactions with tetramethyl lead, hexaphenyl dilead, and triphenyl lead chloride yield aryl organo tellurium dichlorides  

The reaction between aryl (phenyl, substituted phenyl, naphthyl) tellurium trichlorides and aryl mercury chlorides or acetates are best carried out with dioxane as the solvent. The mercury(II) salts precipitate as their dioxane adducts. The symmetrical or unsymmetrical 

Irgolic Organic Tellurium Compounds with one Te,C Bond 

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Other reactions of aryl organometallic compounds are treated with their aliphatic analogs reactions 2-25 through 2-36. 

By using the reactions described in Sections 19.2 through 19.6, it is possible to convert one carboxylic acid derivative to any other carboxylic acid derivative. Now let s examine the reactions of these compounds with hydride and organometallic nucleophiles. In these cases the products are no longer carboxylic acid derivatives. 

The SN reaction under consideration is not terminated until water, a dilute acid, or a dilute base is added to the crude reaction mixture. The tetrahedral intermediate B is then protonated to give the compound E. Through an El elimination it liberates the carbonyl compound C (cf. discussion of Figure 6.4). Fortunately, at this point in time no overreaction of this aldehyde with the nucleophile can take place because the nucleophile has been destroyed during the aqueous workup by protonation or hydrolysis. In Figure 6.32 this process for chemoselective acylation of hydride donors, organometallic compounds, and heteroatom-stabilized carbanions has been included as strategy 1. ... 

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