Abstract
The reaction of [Cp3ThCl] with in situ generated 1-lithium-3,3-diphenylcyclopropene results in the formation of [Cp3Th(3,3-diphenylcyclopropenyl)] (1), in good yields. Thermolysis of 1 results in isomerization to the ring-opened product, [Cp3Th(3-phenyl-1H-inden-1-yl)] (3) via a hypothesized carbene intermediate. This transformation represents a new mode of reactivity of 3,3-diphenylcyclopropene with the actinides, improving our ability to use this reagent as a carbene source. A combined DFT and 13C{1H} NMR analysis of 1 shows a spin-orbit induced downfield shift at Cα due to participation of the 5f orbitals in the Th-C bond.
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