Bicyclo(1.1.1)pentane

bicyclo[1.1.1]pentane
Names
	IUPAC name bicyclo[1.1.1]pentane
Identifiers
CAS Number	311-75-1;
3D model (JSmol)	Interactive image;
ChemSpider	119929;
PubChem CID	136153;
	InChI InChI=1S/C5H8/c1-4-2-5(1)3-4/h4-5H,1-3H2 Key: MKCBRYIXFFGIKN-UHFFFAOYSA-N;
	SMILES C1C2CC1C2;
Properties
Chemical formula	C5H8
Molar mass	68.119 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

Bicyclo[1.1.1]pentane is an organic compound, the simplest member of the bicyclic bridged compounds family. It is a hydrocarbon with formula C₅H₈. The molecular structure consists of three rings of four carbon atoms each.

Bicyclo[1.1.1]pentane is a highly strained molecule.

Usage

Kenneth Wiberg and Frederick Walker used bicyclo[1.1.1]pentane to make [1.1.1]propellane.[1]

The bicyclo[1.1.1]pentane structure has been used as an unusual bioisostere for a phenyl ring.[2]

Wiberg, Kenneth B.; Walker, Frederick H. (1982). "[1.1.1]Propellane". J. Am. Chem. Soc. 104 (19): 5239–5240. doi:10.1021/ja00383a046.
Stepan, Antonia F.; Subramanyam, Chakrapani; Efremov, Ivan V.; Dutra, Jason K.; O’Sullivan, Theresa J.; DiRico, Kenneth J.; McDonald, W. Scott; Won, Annie; Dorff, Peter H. (2012-04-12). "Application of the Bicyclo[1.1.1]pentane Motif as a Nonclassical Phenyl Ring Bioisostere in the Design of a Potent and Orally Active γ-Secretase Inhibitor". Journal of Medicinal Chemistry. 55 (7): 3414–3424. doi:10.1021/jm300094u. ISSN 0022-2623. PMID 22420884.

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