Cyclodecapentaene

Cyclodecapentaene
	all-cis isomer of cyclodecapentaene
Names
	Preferred IUPAC name Cyclodeca-1,3,5,7,9-pentaene
	Other names [10]Annulene
Identifiers
CAS Number	3227-76-7;
3D model (JSmol)	Interactive image;
ChemSpider	11341429 all-cis isomer;
PubChem CID	15398566;
	InChI InChI=1S/C10H10/c1-2-4-6-8-10-9-7-5-3-1/h1-10H/b2-1-,3-1-,4-2-,5-3+,6-4+,7-5+,8-6+,9-7-,10-8-,10-9- Key: ZYRKBGIIBMTQHN-HGJACCJQSA-N;
	SMILES C1=C\C=C\C=C/C=C/C=C/1;
Properties
Chemical formula	C10H10
Molar mass	130.190 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Cyclodecapentaene or [10]annulene is an annulene with molecular formula C₁₀H₁₀. This organic compound is a conjugated 10 pi electron cyclic system and according to Huckel's rule it should display aromaticity. It is not aromatic, however, because various types of ring strain destabilize an all-planar geometry.