Chalcogenoesters (thiol (l), selenol (2) and tellurol esters (3)) are useful synthetic intermediates having been employed, for example, as mild acyltransfer reagents,'building blocks of heterocyclic compounds (oxazole, 2 p-lactone3), precursors of acyl radicals4 or anions: and for asymmetric aldol reactions. 6 In spite of the growing interest in new organic transformations of these compounds, preparative methods available are still limited, with ...
