Cyclooctadecanonaene

Cyclooctadecanonaene
	; "Herringbone" crystal structure of [18]annulene
Names
	Preferred IUPAC name (1Z,3E,5E,7Z,9E,11E,13Z,15E,17E)-Cyclooctadeca-1,3,5,7,9,11,13,15,17-nonaene
Identifiers
CAS Number	2040-73-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	120988 ;
PubChem CID	137294;
	InChI InChI=1S/C18H18/c1-2-4-6-8-10-12-14-16-18-17-15-13-11-9-7-5-3-1/h1-18H/b2-1-,3-1+,4-2+,5-3+,6-4+,7-5-,8-6-,9-7+,10-8+,11-9+,12-10+,13-11-,14-12-,15-13+,16-14+,17-15+,18-16+,18-17- Key: STQWAGYDANTDNA-DWSNDWDZSA-N ; InChI=1/C18H18/c1-2-4-6-8-10-12-14-16-18-17-15-13-11-9-7-5-3-1/h1-18H/b2-1-,3-1+,4-2+,5-3+,6-4+,7-5-,8-6-,9-7+,10-8+,11-9+,12-10+,13-11-,14-12-,15-13+,16-14+,17-15+,18-16+,18-17- Key: STQWAGYDANTDNA-DWSNDWDZBB;
	SMILES C1=CC=CC=CC=CC=CC=CC=CC=CC=C1;
Properties
Chemical formula	C18H18
Molar mass	234.3 g·mol−1
Appearance	red-brown crystals
Density	1.134 g/cm3 (calc.)
Structure
Space group	monoclinic, P21/a
Lattice constant	a = 1.4984 (5) nm, b = 0.4802(2) nm, c = 1.0260(3) nm α = 90°, β = 111.52(1)°, γ = 90°
Formula units (Z)	2
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Cyclooctadecanonaene or [18]annulene is an organic compound with chemical formula C
₁₈H
₁₈. It belongs to the class of highly conjugated compounds known as annulenes and is aromatic. The usual isomer that [18]annulene refers to is the most stable one, containing six interior hydrogens and twelve exterior ones, with the nine formal double bonds in the cis,trans,trans,cis,trans,trans,cis,trans,trans configuration. It is reported to be a red-brown crystalline solid.

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