BOOKS 3 H C 1 ^ H 2 C 1 + + HCI 2 The chapter on anhydrous hydrogen fluoride is superb in both coverage and the critical fashion in which the various topics are presented. The first half deals with handling techniques, physical properties, structure, and experimental methods for studying dissolved species. A discussion of reactions in which liquid hydrogen fluoride is both solvent and reactant and those in which it acts solely as an ionizing solvent is the content of most of the rest of the chapter. The chapter closes with a brief section in which the authors out line significant areas worthy of investi gation. The recent extensive research on sul furic acid as a solvent is reviewed suc cinctly and thoroughly. Among the topics covered in detail are physical properties, self-dissociation, cryoscopy in the solvent, solvation numbers, con ductivity of solutions, and reactions of both inorganic and organic compounds with the solvent. There is a brief dis cussion of physical properties and selfdissociation equilibria of dideuterosulfuric acid, aromatic sulfonation, the higher sulfuric acids, and halogen-sub stituted sulfuric acids. In view of its strong oxidizing power, it is not surprising that anhydrous nitric acid has little vahie as a noirparticipating medium for chemical reactions. The make-up of the chapter on this substance reflects that point. Some of the chapter is concerned with topics that are only tenuously related to the solvent characteristics of the compound. Thus there are sections on nitronium compounds and aromatic nitration (in sulfuric acid, nitromethane, and acetic acid solutions, and by nitronium com pounds), in addition to a section largely concerned with the decomposition of nitric acid in the vapor state. Topics more pertinent to solvent characteristics include physical properties, structure, self-dissociation, cryoscopy and conduc tivity in the solvent, and properties of such systems as H N 0 3 - H o S 0 4 , Η Ν Ό 3 H 2 0 , H N 0 3 - N 2 0 B , and H N 0 3 - N 2 0 4 . The chapter on amides treats inten sively and well the compound formamide, A^-methylformamide, acetamide, A^methylacetamide, dimethylacetamide, and dimethylformamide. In general, the pattern of topics covered includes preparation and purification, physical properties, solubility characteristics, electrochemical studies, and reactions in the solvent. The chapter contains excellent tables of data. The chapter on metal solutions in nonaqueous solvents is excellent. Here the author carefully examines the physical properties of such solutions in the light of current models regard-
Usually it doesn't matter which brand you specify . . . Unless you require absolute purity
If you want Organic Reference Standards with a minimum purity of 99.9 mol %, ash your MC&B Distributor for MC&B Criterioquality. Quality is monitored by gas chromatography throughout the purification process until no further increase in purity is noted. Then, purity is confirmed by a precise freezing point method. A lot chromatogram is supplied with each unit. Our Criterioquality line includes aliphatic and aromatic hydrocarbons, alcohols, ketones, and other interesting compounds. There is no other commercially available line like it.
Matheson, Coleman & Bell /Manufacturing Chemists Norwood, Ohio /Los Angeles, California /East Rutherford, N. J. Circle No. 166 on Readers' Service Card
VOL. 39, NO. 14, DECEMBER 1967
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