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Reference.org
Propellane
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, propellane is any member of a class of <a href="/facts/Polycyclic_compound/9mq2JNFq">polycyclic</a> <a href="/facts/Hydrocarbon/Dcg95Ju5">hydrocarbons</a>, whose carbon skeleton consists of three rings of <a href="/facts/Carbon/ukrgQexo">carbon</a> atoms sharing a common <a href="/facts/Carbon%25E2%2580%2593carbon_bond/nLE4z5BK">carbon–carbon covalent bond</a>. The concept was introduced in 1966 by D. Ginsburg Propellanes with small cycles are highly strained and unstable, and are easily turned into <a href="/facts/Polymer/eF32E50K">polymers</a> with interesting structures, such as <a href="/facts/Staffane/23qvIYQx">staffanes</a>. Partly for these reasons, they have been the object of much research. </p>