Singlet carbenes add stereospecifically to alkenes, and alkene stereochemistry is retained in the cyclopropane product. Fluorocarbon anesthetics reduce the hazard of flammability with diethyl ether and cyclopropane. Alternatively, the carbene can be trapped by an alkene to form a cyclopropane derivative. Several methods exist for converting alkenes to cyclopropane rings using carbene type reagents. Another modification of C-3' with cyclopropane and epoxide moieties were also found to be potent. Furthermore, the hydrogens in cyclopropane are eclipsed. Pyrethrin I (CHO) and pyrethrin II (CHO) are structurally related esters with a cyclopropane core. A high ratio of cyclopropane to monounsaturated fatty acid indicates stress conditions. Like nitrous oxide and cyclopropane, xenon activates the two-pore domain potassium channel TREK-1. This colorless gas is the monomethyl derivative of cyclopropane. The initially formed cyclopropane undergoes a ring expansion and subsequent elimination of hydrogen fluoride. In a similar manner, propane and cyclopropane, butane and cyclobutane, etc. These findings compared favorably with those reported for cyclopropane (42%), trichloroethylene (28%), and halothane (4.6%). Syntin is a molecule with two stereocenters at the central cyclopropane ring. The smallest cycloalkane family is the three-membered cyclopropane ((CH)).