Tanden vicinal difunctionalization of alkynes

A tanden anh-vicinal difunctionalization of alkynes, involving the addition of a lithium organotellurolate to an activated alkyne, with subsequent trapping of the vinyllithium intermediate with electrophiles, was recently reported and named electrotelluration.  

E = PhCHO, C3H7CHO, PhjCO 43-84% (Zmain or oniy product) 

Employing alkinyl esters bearing an aldehyde group with different chain length, an intramolecular reaction occurs giving five- to eight-membered cyclic systems. 

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