However, in all cases, the star ng materials were recovered. Transannular cycliza on of the dianion of exo,exo ester 2 with the forma on of the stellane core was computa onally modeled using ab ini o and density func onal theory (DFT) methods, taking exo,exo diacid 7 as a model compound. The DFT M06-2X func onal with the aug-cc-pVTZ basis set and MP2 method as a standard ab ini o algorithm, in combina on with the 6-31+G(d,p) basis set , were employed, taking into account the size of the system. Solvent effects were considered within the polarizable con nuum model (PCM) in THF .