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- W2021096908 abstract "Abstract 1,1-Ethylene-1H-azulenium tetrafluoroborate (1b) and its alkyl substituted derivatives, 6-t-butyl (1c) and 4-isopropyl-3,8-dimethyl ones (1d), were synthesized starting from their corresponding azulenes by a three-step sequence which includes reduction, cyclopropanation and hydride abstraction reactions. The cation 1 b and its 6-t-butyl derivative 1c, generated in deuterated acetonitrile at −20 °C, were characterized by low-temperature NMR spectroscopy. On the other hand, the cation 1d was isolated as slightly unstable, greenish-yellow crystals. While the cation 1 b in solution underwent expansion of the cyclopropane ring at elevated temperatures, 1 c and 1 d just decomposed. All the cations were found to react easily with nucleophiles to give thermodynamically controlled, stable addition products at their cyclopropane methylene carbons." @default.
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- W2021096908 date "1999-05-01" @default.
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- W2021096908 title "1,1-Ethylene-1H-azulenium ion and its alkyl substituted derivatives: Synthesis, characterization, and some reactions thereof" @default.
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- W2021096908 doi "https://doi.org/10.1016/s0040-4020(99)00280-x" @default.
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