Electronic nature of carbonium ions and their silicon analogues.
Nonclassical ions or carbonium ions have multi-center bonding from delocalized sigma or pi electrons. The 2-norbornyl cation, its derivative 6,6-difluoro-2-norbornyl cation, tris-homocyclopropenyl cation, 7-norbornenyl cation, and 4-cyclopentenyl cation and their corresponding silicon analogues were studied in this work. All carbocations have topologically different 3c-2e systems. The magnitude of all delocalization indexes between each atomic pair of the 3c-2e bond can be used to predict homoaromaticity. The silicon analogues have a topologically different 3c-2e bond from their corresponding carbocation.
Firme
Caio L
CL
Universidade Federal do Rio de Janeiro, Instituto de Química, Avenida Athos da Silveira Ramos, 149, CT Bloco A, Sala 622, Cidade UniversitAria, Ilha do Fundão, Rio de Janeiro, BR 21941-909, Brazil. cfirme@iq.ufrj.br
Antunes
O A C
OA
Esteves
Pierre M
PM