Question: Classify the ring carbons as up C’s or down C’s. Identify the bonds highlighted in bold as axial or equatorial.
The identification of the highlighted bonds, either axial or equatorial, is as illustrated below:
The horizontal and vertical bonding in any chair conformation is named equatorial (eq) and axial (ax) positions, respectively. The axial position is perpendicular to the structure.
The blue color shows the position of the axial bond, whereas the black color shows the position of the equatorial bond as illustrated below:
The given conformation is compared with the above conformation. The highlighted bonds, as axial or equatorial, are as shown below:
Highlighted bonds as axial or equatorial
Question: Consider the tricyclic structure B.
(a) Label each substituent on the rings as axial or equatorial.
(b) Draw B using chair conformations for each six-membered ring.
(c) Label the atoms on the ring fusions (the carbons that join each set of two rings together) as cis or trans to each other.
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