Cyclopropane

Cyclopropane^[1]
Names
	Preferred IUPAC name Cyclopropane
Identifiers
CAS Number	75-19-4 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30365 ;
ChEMBL	ChEMBL1796999 ;
ChemSpider	6111 ;
ECHA InfoCard	100.000.771
KEGG	D03627 ;
PubChem CID	6351;
UNII	99TB643425 ;
UN number	1027
CompTox Dashboard (EPA)	DTXSID4058786 ;
	InChI InChI=1S/C3H6/c1-2-3-1/h1-3H2 Key: LVZWSLJZHVFIQJ-UHFFFAOYSA-N ; InChI=1/C3H6/c1-2-3-1/h1-3H2 Key: LVZWSLJZHVFIQJ-UHFFFAOYAL;
	SMILES C1CC1;
Properties
Chemical formula	C3H6
Molar mass	42.08 g/mol
Appearance	Colorless gas
Odor	Sweet, ethereal
Density	1.879 g/L (1 atm, 0 °C); 680 g/L (liquid)
Melting point	−128 °C (−198 °F; 145 K)
Boiling point	−32.9 °C (−27.2 °F; 240.2 K)
Solubility in water	502 mg/L
Vapor pressure	640 kPa (20 °C); 1350 kPa (50 °C)
Acidity (pKa)	~46
Magnetic susceptibility (χ)	−39.9·10−6 cm3/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Highly flammable; Asphyxiant
	GHS labelling:
Pictograms
Signal word	Danger
NFPA 704 (fire diamond)	1 4 0 SA
Autoignition; temperature	495 °C (923 °F; 768 K)
Explosive limits	2.4 % (lower); 10.4 % (upper)
Safety data sheet (SDS)	Air Liquide
	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

Cyclopropane is the cycloalkane with the molecular formula (CH₂)₃, consisting of three methylene groups (CH₂) linked to each other to form a triangular ring. The small size of the ring creates substantial ring strain in the structure. Cyclopropane itself is mainly of theoretical interest, but many cyclopropane derivatives are of commercial or biological significance.^[3]

Cyclopropane was used as a clinical inhalational anesthetic from the 1930s through the 1980s. The substance's high flammability poses a risk of fire and explosions in operating rooms due to its tendency to accumulate in confined spaces, as its density is higher than that of air.

^ Merck Index, 11th Edition, 2755.
^ "Front Matter". Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 137. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
^ Faust, Rüdiger (2001). "Fascinating Natural and Artificial Cyclopropane Architectures". Angewandte Chemie International Edition. 40 (12): 2251–2253. doi:10.1002/1521-3773(20010618)40:12<2251::AID-ANIE2251>3.0.CO;2-R. PMID 11433485.

[1] Merck Index, 11th Edition, 2755.

[iupac2013-2] "Front Matter". Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 137. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.

[Faust-3] Faust, Rüdiger (2001). "Fascinating Natural and Artificial Cyclopropane Architectures". Angewandte Chemie International Edition. 40 (12): 2251–2253. doi:10.1002/1521-3773(20010618)40:12<2251::AID-ANIE2251>3.0.CO;2-R. PMID 11433485.

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