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Cyclopropane
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<p>Cyclopropane is the <a href="/facts/Cycloalkane/8dQAoD1N">cycloalkane</a> with the molecular formula (CH2)3, consisting of three <a href="/facts/Methylene_group/sdGv7zMu">methylene groups</a> (CH2) linked to each other to form a triangular ring. The small size of the ring creates substantial <a href="/facts/Ring_strain/seIIaK2k">ring strain</a> in the structure. Cyclopropane itself is mainly of theoretical interest but many of its derivatives - <a href="/facts/Cyclopropanes/BAUAYB7s">cyclopropanes</a> - are of commercial or biological significance. </p><p>Cyclopropane was used as a clinical <a href="/facts/Inhalational_anesthetic/INHvFCPk">inhalational anesthetic</a> from the 1930s through the 1980s. The substance's high flammability poses a risk of fire and explosions in operating rooms due to its tendency to accumulate in confined spaces, as its density is higher than that of air. </p>