Cyclopropane
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Cyclopropane is a cycloalkane molecule with the molecular formula C3H6 consisting of three carbon atoms linked to each other to form a ring, with each carbon atom bearing two hydrogen atoms. The bonds between the carbon atoms are a great deal weaker than in a typical carbon-carbon bond. This is the result of the 60° angle between the carbon atoms, which is far less than the normal angle of 109°. This ring strain has to be subtracted from the normal C-C bond energy, making the resultant compound more reactive than acyclic alkanes and other cycloalkanes such as cyclohexane and cyclopentane.
Boiling point: -32.8°C Freezing point: -127°C
The naturally ocurring pyrethrum insecticides (found in certain Chrysanthemum species) contain a cyclopropane ring.de:Cyclopropan