FIGURE 3. Isolation and unambiguous characterization of 2-quinuclidonium tetrafluoroborate.

From the following article:

Synthesis and structural analysis of 2-quinuclidonium tetrafluoroborate

Kousuke Tani and Brian M. Stoltz

Nature 441, 731-734 (8 June 2006)

doi:10.1038/nature04842

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a, Isolation of 1dotHBF4. b, ORTEP drawing of 1dotHBF4 (shown with 50% probability ellipsoids, BF4– omitted for clarity. Nitrogen = blue, oxygen = red, carbon = black and hydrogen = white).

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