Cyclic telluroethers

Reductive detelluration of cyclic telluroethers (typical procedure) To a solution of 2,3-diliydro-2-[(phenylteUuro)methyl]benzofuran (0.338 g, 1 mmol) in toluene (6 ml.) is injected TBTH (0.67 ml, 2.5 mmol) at room temperamre, and the resulting solution is stirred under reflux for 1 h. The solution is evaporated under vacuum and the residual yellowish oil subjected to Si02 column chromatography (eluting with benzene/hexane, 3 1) to give pure 2,3-dihydro-2-methylbenzofuran as a colourless oil (0.128 g (95%) b.p. 93-94°C/23 torr). 

Several cyclic telluroethers and their derivatives are known, as exemplified by some common examples below (for a more detailed discussion, see Ref 36) ... 

A variety of unsaturated alcohols with a cyclic structure and allyl phenols lead to bicycUc telluroethers. 

Several types of telluroether (diorganyl tellmide) ligands are known. They can be monodentate or polydentate, acyclic, cyclic, and macrocyclic as well as hybrid telluroether ligands containing other donor atoms in addition to tellurium. Complexes with tellmoether ligands have seen extensive research activity in recent years (for two most recent reviews, see Refs. 27 and 35). 

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