1-methylnaphthalene

1-Methylnaphthalene

Names
IUPAC name 1-Methylnaphthalene
Other names α-methylnaphthalene
Identifiers
CAS Number	90-12-0 Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:50717 Y
ChemSpider	6736 Y
ECHA InfoCard	100.001.788
EC Number	201-966-8
KEGG	C14082 Y
PubChem CID	7002
InChI InChI=1S/C11H10/c1-9-5-4-7-10-6-2-3-8-11(9)10/h2-8H,1H3 Y Key: QPUYECUOLPXSFR-UHFFFAOYSA-N Y InChI=1/C11H10/c1-9-5-4-7-10-6-2-3-8-11(9)10/h2-8H,1H3 Key: QPUYECUOLPXSFR-UHFFFAOYAD
SMILES c1cccc2cccc(c12)C
Properties
Chemical formula	C11H10
Molar mass	142.20 g/mol
Appearance	Liquid
Density	1.001 g/mL
Melting point	−22 °C (−8 °F; 251 K)
Boiling point	240–243 °C (464–469 °F; 513–516 K)
Vapor pressure	4.91
Magnetic susceptibility (χ)	-102.8·10−6 cm3/mol
Hazards
R-phrases (outdated)	R22 R42 R43
S-phrases (outdated)	S7 S36 S37 S39
Flash point	82 °C (180 °F; 355 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

1-Methylnaphthalene is a polycyclic aromatic hydrocarbon (PAH). It has a cetane number of zero, and was previously used as the lower reference for cetane number. However, due to the expense and handling difficulty of 1-methylnaphthalene, it was replaced in this capacity by isocetane, with a CN of 15.

On February 22, 2014, NASA announced a greatly upgraded database for detecting and monitoring PAHs, including 1-methylnaphthalene, in the universe. According to NASA scientists, over 20% of the carbon in the universe may be associated with PAHs, possible starting materials for the formation of life. PAHs seem to have been formed shortly after the Big Bang, are abundant in the universe, and are associated with new stars and exoplanets.