García Romero, A.Fernández López, IsraelGoicoechea, J. M.2025-09-112025-09-112025-08-04Á. García-Romero, I. Fernández, J. M. Goicoechea, Angew. Chem. Int. Ed. 2025, 64, e202509661. https://doi.org/10.1002/anie.20250966110.1002/anie.202509661https://hdl.handle.net/20.500.14352/123838Sequential [2 + 2] cycloaddition reactions between acetylene and the digallene and diindene compounds (ETer)2 (E = Ga, In; Ter = 2,6-Dipp2-C6H3; Dipp = 2,6-diisopropylphenyl) are described. Careful control of the reaction conditions leads to selective formation of four- and six-membered rings with 2π E2C2 and 4π E2C4 cores, respectively. A structural analysis of the heterocycles by single crystal X-ray diffraction suggests limited electronic delocalization within the rings, which is borne out in their reactivity. For example, the six-membered cyclohexadiene analogues exhibit Lewisacidic behavior and can form stable, isolable adducts with ammonia. Upon heating, these adducts transform into the corresponding bimetallic triel amides with concomitant generation of ethene.engjournal articlehttps://doi.org/10.1002/anie.202509661https://onlinelibrary.wiley.com/doi/epdf/10.1002/anie.202509661open access547Ammonia activationCyclization reactionsDigallenesDiindenesMain-group chemistryQuímica23 Química