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With knowledge of ring strain, placing a double bond within a cyclopropane ring would increase the "angle strain" from $109.5 ^\circ$ to $120 ^\circ$ so are cyclopropenes stable? So far, I have only come across the famous aromatic cyclopropene cation but yet to see a neutral cyclopropene ring containing molecule. However, cyclopropanes are quite stable and sometimes occur in nature, so are cyclopropenes well known too?

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  • $\begingroup$ en.wikipedia.org/wiki/Cyclopropene $\endgroup$ – Mithoron Mar 29 at 19:18
  • $\begingroup$ I see, thank you. Is it possible for these rings to exist in naturally occurring molecules like amino acids? $\endgroup$ – ilovechemistry Mar 29 at 19:28
  • $\begingroup$ "derivatives are known in some fatty acids.". From the referenced WP article. $\endgroup$ – Oscar Lanzi Mar 29 at 19:55
  • $\begingroup$ Google sterculic acid. $\endgroup$ – user55119 Mar 29 at 20:09

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