Functionalized bicyclic electrophilic allenes and (or) spiro ketones have been obtained through a cascade reaction when acetylenic ω-keto esters were treated with tetra-n-butylammonium fluoride (TBAF). The isolated products can be modulated by using different starting materials (i.e. varying ring size, spacer length) and reaction times. The results indicate that these reactions take place under kinetic control. In line with this, a semiempirical study was carried out in order
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