Sylvia A. Gardner

Organotellurium(IV) complexes: synthesis and molecular structure of 2,6-diacetylpyridine (C,N,O) tellurium(IV) trichloride

Abstract The reaction of TeCl4 with 2,6-diacetylpyridine in methylene chloride or tetrahydrofuran gives a new type of organotellurium (IV) compound. An X-ray structure determination showed that the organic radical bonds to the tellurium as a tridentate ligand via a methylene carbon of one of the acetyl groups, the pyridine nitrogen, and the carbonyl oxygen of the second acetyl group. Analogous organotellurium trichloride complexes involving C,O coordination have been formulated for the condensation products of TeCl4 with 2-acetylcyclohexanone and 3-acetyl-7-methoxycoumarin, while C,N coordination occurs in the condensation product of TeCl4 and 2-acetylpyridine.

Synthesis and properties of tellurium(II) compounds: Diaryltelluroesters, ArCOTeAr′

Abstract A series of organotellurium(II) derivatives of the general formula ArCOTeAr′ (Ar,Ar′ = phenyl, p-tolyl, p-anisyl, p-bromophenyl, p-trifluoromethylphenyl, 1-naphtyl) have been prepared and characterized chemically and spectroscopically. Various chemical reactions of this class of compounds have been investigated, and the reaction of these compounds with (PhCN) 2 PdCl 2 to give the polymeric (Pd(TeAr′) 2 ) n derivatives suggests that these organotellurium reagents may be useful precursors of TeAr′ − ligands in reactions with transition-metal substrates.

Synthesis and raman spectra of unsymmetrical organotellurides containing a tellurium/group IV a element bond (ArTeMPh3; M = Ge, Sn, Pb)

A series of tellurium(II) compounds containing tellurium/Group IV A element bonds of the general formula ArTeMPh3 (Ar = phenyl, p-tolyl, p-anisyl, p-bromophenyl; M = Ge, Sn, Pb)were prepared and examined by various chemical and spectroscopic means, including Raman spectroscopy, for characterization of metal—metal bond vibrations. These materials are air-stable, light-yellow solids, soluble in a variety of organic solvents, and an excellent source of the ArTe radical in reactions with transition metals. In reactions of these compounds with complexes of copper and palladium, the tellurium/Group IV A element bond was cleaved, with formation of transition metal complexes formulated as TeAr-bridged polymers.

Synthesis and reactions of rhodium compounds containing tellurium donor ligands

Abstract This paper describes the synthesis and characterization of a series of rhodium(I) and rhodium(III) complexes containing tellurium-rhodium bonds resulting from the coordination of diorgano telluride or organotelluro ligands. Oxidative addition, metathesis and substitution reactions of these compounds have been examined, and the resulting products are compared with those from the known reactions of rhodium(I) and rhodium(III) compounds containing phosphine ligands.

Mercapto acid compounds of tellurium(II): stabilization of telluriumsulfur bonded compounds via intramolecular chelation

Abstract A series of tellurium (II0 compounds of general formula (RS) 2 Te (R = C 6 H 5 , 2-C 10 H 7 , HOOCCH 2 CH 2 , HOOCCH(Me), HOOCCH 2 , 2-(HOOC)C 6 H 4 , HOOCCH 2 CH(COOH), NaOOCCH 2 CH 2 , NH 4 OOCCH 2 CH 2 ) have been prepared and characterized. The tellurium compounds containing carboxylic acid or salt groups are isolated as stable, light-yellow solids which are soluble in alcohols or in water, and this stability is thought to be due to telluriumcarbonyl oxygen interactions within the molecule. Bis(benzenethio)tellurium(II) and bis(2-naphthalenethio)tellurium(II) have been synthesized and are unstable both in the solid state and in solution. Nixed derivatives containing one aryl and one sulfide bonded to tellurium (ArTeSCH 2 CH 2 COOH) have also been prepared, and the reactions of these compounds with dichlorobis(benzonitrile)palladium(II) yield palladium complexes containing two tellurium ligands.