A metal-free carbon catalyst for oxidative dehydrogenation of aryl cyclohexenes to produce biaryl compounds.

ABSTRACT: A metal-free route based on a carbon catalyst to synthesize biphenyls through oxidative dehydrogenation (ODH) of phenyl cyclohexene has been investigated. Among the samples examined, an air-oxidized active carbon exhibits the best activity with a 9.1 × 10^-2 h^-1 rate constant, yielding 74% biphenyl in 28 h at 140 °C under five bar O₂ in anisole. The apparent activation energy is measured as 54.5 kJ⋅mol^-1. The extended reaction scope, consisting of 15 differently substituted phenyl cyclohexenes, shows the wide applicability of the proposed method. The catalyst's good recyclability over six runs suggests this ODH method as a promising route to access the biaryl compounds. In addition, the reaction mechanism is investigated with a combination of X-ra

SUBMITTER: Yang M 

PROVIDER: S-EPMC10401020 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature