Alkylation Subject index

Ionic liquids are a class of solvents and they are the subject of keen research interest in chemistry (Freemantle, 1998). Hydrophobic ionic liquids with low melting points (from -30°C to ambient temperature) have been synthesized and investigated, based on 1,3-dialkyl imidazolium cations and hydrophobic anions. Other imidazolium molten salts with hydrophilic anions and thus water-soluble are also of interest. NMR and elemental analysis have characterized the molten salts. Their density, melting point, viscosity, conductivity, refractive index, electrochemical window, thermal stability, and miscibility with water and organic solvents were determined. The influence of the alkyl substituents in 1,2, 3, and 4(5)-positions on the imidazolium cation on these properties has been scrutinized. Viscosities as low as 35 cP (for l-ethyl-3-methylimi-dazolium bis((trifluoromethyl)sulfonyl)amide (bis(triflyl)amide) and trifluoroacetate) and conductivities as high as 9.6 mS/cm were obtained. Photophysical probe studies were carried out to establish more precisely the solvent properties of l-ethyl-3-methyl-imidazolium bis((trifluoromethyl)sulfonyl)amide. The hydrophobic molten salts are promising solvents for electrochemical, photovoltaic, and synthetic applications (Bon-hote et al., 1996). 

This year, following a consultation exercise involving members of the Editorial Board, and partly in the interest of getting the Volume published as soon as possible after the end of the year being reviewed, the Index is less comprehensive than formerly. It now includes only systematic heterocyclic ring system names. Thus, wherever a pyrrole is discussed, that would be indexed under pyrroles wherever pyrido[3,4-i]indoles are mentioned an indexed entry under that name will be found similarly aceanthryleno[l,2-e][l,2,4]triazines , azirines , 2f/-pyran-2-ones , 1,2,4-triazoles etc. etc. are listed. But, subjects like 4-ethyl-5-methylpyrrole , 5-acylazirines , 6-alkyl-2//-pyran-2-ones , 3-alkylamino-l,2,4-triazoles , are not listed as such in the Index. Diels-Alder reaction or Fleck coupling etc., are also not indexed. 

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