1-Methylnaphthalene

Reference fuel

1-Methylnaphthalene defines the lower (zero) reference point of cetane number, a measure of diesel fuel ignition quality, as it has a long ignition delay (poor ignition qualities). In contrast, cetane, with its short ignition delay, defines the upper reference point at 100. In testing, isocetane (2,2,4,4,6,8,8-heptamethylnonane or HMN) replaced 1-methylnaphthalene as the low cetane number reference fuel in 1962 for reasons of better oxidation stability and ease of use in the reference engine. The scale is unchanged, as isocetane's cetane number is measured at 15, referenced to 1-methylnaphthalene and cetane.

Methylnaphthalene anion

With alkali metals, 1-methylnaphthalene forms radical anion salts such as sodium 1-methylnaphthalene.

Compared to its structural analog sodium naphthalene, sodium 1-methylnaphthalene is more soluble, which is useful for low-temperature reductions.

References

References

1. [http://msds.chem.ox.ac.uk/ME/1-methylnaphthalene.html 1-Methylnaphthalene] {{Webarchive. link. (2008-05-13 at [[University of Oxford]])
2. (December 1952). "Separation of 1- and 2-Methylnaphthalenes by Azeotropic Distillation". Industrial & Engineering Chemistry.
3. Gerd Collin. (2003). "Naphthalene and Hydronaphthalenes".
4. Speight, James G.. (2015). "Handbook of Petroleum Product Analysis.". Wiley.
5. Jääskeläinen, Hannu. (2007). "Fuel Property Testing: Ignition Quality". ECOpoint Inc..
6. (2004). "Hexacarbonylvanadate(1−) and Hexacarbonylvanadium(0)". Inorg. Synth..