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The structure of capsaicin, the molecule that is responsible for the "heat" in chili peppers, is shown below.

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asked 2021-03-02

The structure of capsaicin, the molecule that is responsible for the "heat" in chili peppers, is shown below.
image
What are the approximate bond angles for the labeled angles? \(\displaystyle\beta=?,\delta,=?,\epsilon=?,\phi=?,\gamma=?\)

Answers (1)

2021-03-03
\(\displaystyle\beta={120}\). There are 3 bonds and no unshared pairs, so itsgeometry is trigonal
\(\displaystyle\delta={104.5}\) There are 3 bonds and one unshared pair,resulting in a "squished" tetrahedral geometry
\(\displaystyle\epsilon={120}\) Another trigonal geometry
\(\displaystyle\phi={109.5}\) This is a standard tetrahedral geometry,occurring when carbon bonds to 4 atoms
\(\displaystyle\gamma={120.3}\) 3 bonded atoms with no unshared pairs
Bonds X and W are the same length because of resonance. Electrons are shared equally among the 6 carbons in the ring.
Bond X is longer than bond Z because because bond Z is a doublebond, while X is closer to a 1.5 bond. Higher bond orderspull the atoms closer together.
Bond Y is longer than bond Z for essentially the same reason as above.
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