# Double bonds within cyclopropane ring

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?

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