Tellurium complexes arylations

Aryl derivatives of the heavier group 6 derivatives can also serve for the synthesis of arylmercury compounds.52 For instance, treatment of the diaryltellurium complex 30 with HgCl2 leads to the formation of a coordination complex which undergoes a slow dismutation reaction to afford the arylmercury chloride derivative 31 and the corresponding tellurium species (Scheme 3).53... 

In 1987, Sonoda and co-workers reported that the tellurium-lithium exchange reaction of l-(phenyltelluro)-2-phenylethene with -butyllithium, followed by capture with benzaldehyde, gave the corresponding allylic alcohol with retention of the double-bond configuration.243 It was observed that, depending on the length of time the reaction mixture of the aryl vinyl telluride and -butyllithium was allowed to equilibrate prior to addition of the electrophile, a complex mixtures of products could be formed (Scheme 97).256... 

Aryl triphenylstannyl tellurium reacted with 1,5-cyclooctadienedichloropalladium in chloroform at 20°. With equimolar amounts of the reagents 1,5-cyclooctadienechloro (arenetellurolato)palladiums were isolated with 2 moles of tellurium compound per mole of palladium complex, 1,5-cyclooctadiene bis[arenetellurolato]palladiums were obtained2. 

The coordinatively unsaturated aryl tellurium halides interact with electron-donor ligands to form complexes. The aryl tellurium halides prepared from diphenyl ditellurium and halogens were used in situ. Thiourea, selenourea (X = Cl, Br)3, tetramethylthio- and... 

When solutions of aniline, JV-methylanilines, or amino(methyl)benzenes are mixed with solutions of tellurium tetrachloride, complexes are formed. These complexes react in refluxing methanol to yield aryl tellurium trihalides1,2 The trihalotelluro group is claimed to occupy the position para to the amino substituent2. 

Aryl tellurium trichlorides treated with the thiosemicarbazides of benzaldehydes or methyl phenyl ketones produced the thiosemicarbazonc complexes of the aryl tellurium monochlorides8. 

Aryl tellurium trichlorides and N-, S-, or 0-donor ligands form 1 1 complexes when the components are combined in an organic solvent. Several complexes with a 1 2 stoichiometry and one complex with a 1 4 stoichiometry were also prepared. The few complexes of alkyl tellurium trihalides that are reported in the literature all have 1 1 stoichiometry The following organic compounds served as ligands. ... 

Most of the complexes have well defined melting points. They appear to be monomeric in solution . An interesting method for the preparation of thiazolidine-2-thione complexes of aryl tellurium trichlorides is the addition of the tellurium compound to a melt of the ligand kept at 110°. Complexes with 1 1, 1 2, and 1 4 stoichiometries (Te-compound ligand) were obtained after recrystallization from dry methanol. Phenyl tellurium trichloride complexes with thiourea appear to form only when an organic solvent is used as the reaction medium in aqueous media the trichloride is reduced to the monochloride that is isolated as the thiourea adduct . 

A review entitled thiophenes from Viktor Meyer to Poly (thiophene) some reactions and synthesis was published in a special issue of Phosphorus, Sulfur and the related elements (13PS287). Over 80 reaction schemes are presented outlining important discoveries in the chemistry of thiophenes. Another review generalized published data on the reactions of 4-(2-R-aryl)-1,2,3-thia- and selenadiazoles (13RJOC479). Special emphasis on the use of these selenadiazole for the synthesis of 1-benzothiophenes, 1-benzosele-ophenes, and their more complex derivatives was presented. A recent review on recent advances in the use of the Wfllgerodt-Kindler reaction in thiophene syntheses appeared this year (13CSV7870). Extensive reviews on selenium and tellurium chemistry from small molecules to biomolecules and materials (B-13M001) as well as data on the synthesis, reactions, crystal structures, and spectral characteristics of benzo[b]tellurophene, dibenzo[b,d]... 

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