Selone-stabilized aryltellurenyl cations
| Autor: | Ray J. Butcher, Harkesh B. Singh, Sangeeta Yadav, Saravanan Raju |
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| Rok vydání: | 2016 |
| Předmět: |
Trichloride
Stereochemistry 010402 general chemistry 01 natural sciences Medicinal chemistry Adduct Inorganic Chemistry chemistry.chemical_compound Low Oxidation-States Complexes Bromide Salt metathesis reaction Diaryl Ditellurides Triphenylphosphine Acetonitrile Selone Dichloromethane Crystal-Structure 010405 organic chemistry Cationic polymerization Te-Ii Halides 0104 chemical sciences Chalcogen-Chalcogen Bonds chemistry N-Heterocyclic-Carbene Tellurium |
| Zdroj: | Dalton transactions (Cambridge, England : 2003). 45(20) |
| ISSN: | 1477-9234 |
| Popis: | Controlled bromination of a diarylditelluride, R2Te2 (R = 2,6-dimethylphenyl) (6) in dichloromethane led to the formation of a Te(II)-Te(IV) mixed-valent tellurenyl bromide, RBr2TeTeR (7). A further reaction of 7 with 1,3-dibutylbenzimidazolin-2-selone, C15H22N2Se (L) (9), produced the first selone adduct of the 2,6-dimethylphenyltellurenyl cation with the 2,6-dimethylphenyltellurium dibromide anion, [(2,6-Me2C6H3)Te(L)](+)[(2,6-Me2C6H3)TeBr2](-) (10). The red colored cationic adduct 10 is not stable in acetonitrile and disproportionated to give the selone adduct of 2,6-dimethylphenyltellurenyl bromide, [(2,6-Me2C6H3)Te(L)Br] (11b) and bis(2,6-dimethylphenyl)tellurium dibromide, [(2,6-Me2C6H3)2TeBr2], (13). The metathesis reaction of 11b with AgBF4 produced a stable dark red colored selone adduct of the 2,6-dimethylphenyltellurenyl cation with the BF4(-) anion, [(2,6-Me2C6H3)Te(L)](+)BF4(-) (15). The selone adducts of aryltellurenyl halides, i.e. [(2,6-Me2C6H3)Te(L)X] (X = Cl, Br, I) (11a-11c), have been synthesized by a one-pot reaction of 6 with an equimolar mixture of 9 and 1,3-dibutylbenzimidazolin-2-dihaloselones, C15H22N2SeX2 (14a-14c). Triphenylphosphine (PPh3), when treated with [(2,6-Me2C6H3)Te(L)X] (11a-11c), substitutes selone from the adduct to afford the triphenylphosphine adducts of aryltellurenyl halides, [(2,6-Me2C6H3)Te(PPh3)X] (16a-16c). |
| Databáze: | OpenAIRE |
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