A-Methylnaphthalene

A diesel fuel has a cetane number X, if it behaves like a binary mixture of X% (by volume) n-cetane and of (100 - A) % a-methylnaphthalene. 

In practice, the reference base is usually taken not as a-methylnaphthalene but as heptamethyinonane (HMN), a branched isomer of n-cetane. The HMN has a cetane number of 15. In a binary system containing Y% of n-cetane, the cetane number CN vyOl be, by definition (./ - V ... 

Ketones react with formaldehyde and perchloric acid to produce 2-isoxazolines and also with urea in a-methylnaphthalene at 200 °C (75MIP41600, 75ZOB2090, 79MI41612) with N-hydroxyurea they produce 3-hydroxy-2-carbamoylisoxazolidines or, after acid treatment, 2-isoxazolines are formed (Scheme 123) (75TL2337). 

The checkers preferred o -methylnaphthalene (Eastman, Practical) as the diluent. When it is used in the apparatus described the phenol does not distil, so that a reaction flask fitted with an air-cooled condenser is more convenient. The reactants in 60 g. of -methylnaphthalene are heated in an oil bath at 230° for 1.5 to 2 hours. Three grains of Norite and 20 g. more of a-methylnaphthalene are then added, and the mixture is treated as described in the Procedure. The yield and melting point of the product are identical with those described. 

The reaction between phthalonitrUe and copper also takes place readily in boiling quinoline or a methylnaphthalene the pigment is precipitated as fast as it is formed as a crystalline product. It is separated from the excess of copper by shaking with alcohol, when the metal sinks and the pigment, which remains in suspension, can be poured off the process may be repeated to give the pure compound. 

Common Name 1-Methylnaphthalene Synonym a-methylnaphthalene Chemical Name 1-methylnaphthalene CAS Registry No 90-12-0 Molecular Formula CnH10 Molecular Weight 142.197 Melting Point (°C) ... 

Figure 3. Effect of temperature on ignition delay of a-methylnaphthalene and cetene [after Jost (71), data of Mueller (94), and Wolfer (739)]...

Rheological properties are particularly sensitive and for some solubilizates, such as a-methylnaphthalene, the solutions may become viscoelastic the appearence of viscoelasticity often depends on subtle effects in chemical structure29). Certain spectroscopic features are strongly influenced. Thus the H and 13C NMR line widths show large increases, the 81 Br quadrupole relaxation may be strongly affected and there may be the appearance of linear dichroism, birefringence and conductance anisotropy for flowing systems. 

Hydrogenation of dimethyl-naphthalenes to a-methylnaphthalene naphthalene (T 600 Q Hydrogenation of n thaleneto te in... 

Fig. 80. Orientations of electrodynamic birefringence (EDB) of liquids vs. applied electric field e238) j. Bromoform, g = 3660 2 a-methylnaphthalene, g = 1380 s 3 a-bromonaph-...

Photo-addition of alkenes to A methylnaphthalene dicarboxamides in benzene has been studied. The structure of the arene moiety in the imide was important in determining the reaction path. Mainly cyclobutane and oxetan formation occurred. The dicarboximide (342) undergoes photochemical cyclization with incorporation of methanol to yield the two products (343) and (344) in 55 and 16% respectively. This type of cyclization appears to be quite general for such systems and is also reported for the imides (345) and (346). A variety of products resulting from aminolysis, reduction, and radical coupling is produced on irradiation of the phthalimide (347) in diethylamine. ... 

Zhao ZK, Qiao WH, Li ZS et al (2004) Friedel-Crafts alkylation of a-methylnaphthalene in the presence of ionic liquids. J Mol Catal A Chem 222 207-212... 

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