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- W2021468045 abstract "Syntheses with the Reagent Pentamethylcyclopentadienyl Bromide/Silver Tetrafluoroborate: The Pentamethylcyclopentadienyl Cation as Reactive Intermediate Pentamethylcyclopentadienyl bromide 1 reacts with silver tetrafluoroborate with abstraction of the halide ion to form pentamethylcyclopentadienylium tetrafluoroborate (2). The 4π-antiaromatic cation in 2 can be trapped with different nucleophiles. Thus, 2 reacts with methanol to give 5-methoxy-1,2,3,4,5-pentamethyl-1,3-cyclopentadiene (4). In the presence of methylamine, dimethylamine, or diethylamine, the corresponding pentamethylcyclopentadienyl-substituted amines 5, 6, and 9 are formed. Trapping of 1 with pyridine or dimethyl sulfide leads to the ionic compounds 7 and 8, respectively. The reaction of 2 with sterically crowded amines leads to tetramethylfulvene (3)." @default.
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- W2021468045 date "1992-04-01" @default.
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- W2021468045 title "Synthesen mit dem Reagenz Pentamethylcyclopentadienylbromid/Silbertetrafluoroborat: Das Pentamethylcyclopentadienyl‐Kation als reaktive Zwischenstufe" @default.
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- W2021468045 doi "https://doi.org/10.1002/cber.19921250429" @default.
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