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- W2006653270 abstract "Using the B3LYP density functional theory method we have computed the potential energy surface of the (η5-C5H5)Ir-catalyzed acetylene cyclotrimerization. The first step is the oxidative addition which forms the iridacyclopentadiene complex (2) from the bisacetylene complex (η5-C5H5)Ir(η2-HCCH)2 (1), and this is the rate-determining step. On the potential energy surface, acetylene addition to complex (2) forms the iridacyclopentadiene(acetylene) complex (3), and this step is barrier-free and highly exergonic; and complex (3) forms the benzene complex (4) via an intramolecular [4 + 2] cycloaddition. Alternatively, complex (2) and acetylene form the iridabicyclo[3.2.0]heptatriene complex (5) via an intermolecular [2 + 2] cycloaddition, and complex (5) can further isomerize into the aromatic iridacycloheptatriene complex (6a), which is a trap on the potential energy surface. This potential energy surface is qualitatively close to that for the CpRh-catalyzed reaction, but differs strongly from that for the CpCo-catalyzed reaction, which undergoes a spin crossing (or non-adiabatic) mechanism. The differences among these mechanisms as well as the relative stability of their intermediates have been compared and discussed accordingly." @default.
- W2006653270 created "2016-06-24" @default.
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- W2006653270 date "2013-12-01" @default.
- W2006653270 modified "2023-09-27" @default.
- W2006653270 title "Theoretical studies on acetylene cyclotrimerization into benzene catalyzed by CpIr fragment" @default.
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- W2006653270 doi "https://doi.org/10.1016/j.jorganchem.2013.03.036" @default.
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