Journal of the American Chemical Society
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(13) CCDC 1432823 (7b) contains the supplementary crystallo-
graphic data for this paper. These data can be obtained free of charge
from the Cambridge Crystallographic Data Centre via www.ccdc.cam.
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(15) DFT calculations indicate that the anti and syn conformers of
7b lie reasonably close in free energy and they can easily interconvert
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