Editing Cyclopropene (section)

==Structure and bonding==
The molecule has a [[triangular]] structure.  The reduced length of the [[alkene|double bond]] compared to a [[alkane|single bond]] causes the angle opposite the double bond to narrow to about 51° from the 60° angle found in [[cyclopropane]].<ref>{{cite journal |title= Structure of 3-cyanocyclopropene by microwave spectroscopy and ab initio molecular orbital calculations. Evidence for substituent-ring double bond interactions |author= Staley, S. W. |author2= Norden, T. D. |author3= Su, C.-F. |author4= Rall, M. |author5= Harmony, M. D. |journal= J. Am. Chem. Soc. |year= 1987 |volume= 109 |issue= 10 |pages= 2880–2884 |doi= 10.1021/ja00244a004 }}</ref> As with cyclopropane, the carbon–carbon bonding in the ring has increased [[atomic orbital|p character]]: the alkene carbon atoms use sp<sup>2.68</sup> [[Orbital hybridisation|hybridization]] for the ring.<ref>{{cite journal |journal= Tetrahedron |volume= 38 |issue= 5 |year= 1982 |pages= 645–655 |doi= 10.1016/0040-4020(82)80206-8 |title= The geometry of small rings: Molecular geometry of cyclopropene and its derivatives |author= Allen, F. H. }}</ref>