Kinetic studies on the ligand coupling reactions of tetraphenyl sulfurane, selenurane, and tellurane. Thermal stability for hypervalent chalcogen compounds with four carbon-chalcogen bonds
✍ Scribed by Satoshi Ogawa; Soichi Sato; Naomichi Furukawa
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- French
- Weight
- 256 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
L&and coupling kinetics of tetraphenyl sutfurane, selenurane, and tellurane have been studied by the variable temperature NMR experbnents. The first examples of the activation parameters for the ligand coupling (seself decomposition and C-C bond formation) have been obtained for the reactions at three pentacoordinated chalcogeniwn centers; S. Se, Te.
There is considerable interest on the preparation, structure, and reactivity of hypervalent organochalcogen compounds.2.3 Recently, we reported the detection and isolation of a-sulfuranes and a-selenumnes bearing four aryl ligands and the characterization of their structures in solution and solid-stak4 However, no kinetic studies on the thermal reactions of hypervalent chalcogen compounds with four carbon-chalcogen bonds have been reported.5 We present here the first example of the activation parameters for the ligand coupling reactions of pentacoordinated tetraphenyl sulfurane, selenurane, and tellurane by the variable temperature NMR techniques.
Scheme 1