Book Review Fortschritte der Massenspektrometrie. Progress in Mass Spectrometry. Edited by H. Budzikiewicz. Vol. 3. Alkaloide ausser Indol-Triterpen- und Steroidalkaloide. By M. Hesse and H. Pкод для вставкиСкачать
of texture, indexing according to IT0 for any desired symmetry, and the investigations of pressure and temperature variations are also discussed. With its detailed and clear presentation of themes, which are seldom treated elsewhere, this book fills a gap and provides a valuable supplement to books previously available on crystal-structure determination. In spite of the rather high price it can thus be strongly recommended to all concerned with X-ray diffraction. Jouchim Struhle [NB 330 IE] Zum Ablauf ionischer Polymerisationsreaktionen(The course of Ionic Polymerizations). By G . Heublein. Akademie-Verlag, Berlin 1975. 1st edit., viii, 316 pp., numerous figs. and tables, bound, ca. DM 58.--. In comparison with the industrially much more important field of radical polyreactions there are considerably fewer proven results on ionic polymerizations. Thus, it is only in recent years that many of the “classical” concepts of cationic polyreactions have had to be revised. A critical presentation of the present state of our knowledge of ionic polyreactions is thus a difficult but undoubtedly highly valuable exercise. Following a brief comparison of ionic and radical polymerizations and a general outline of the course of ionic polymerizations, the book treats first cationically and then anionically initiated polyreactions; a subsequent chapter is devoted to ionic copolymerizations. In a section contributed by P . Hallpap the current possibilities for quantifying description of ionic polymerizations are collected together with their quantumchemical treatment. A field as wide as this cannot be described in all its parts in equal detail; one misses, e.g. the recent investigations by P . H . Plesch’s school on cocatalyst-free cationic initiation of polymerization with aluminum trichloride and the pseudocationic polymerizations by ester formation. Objections in principle must be noted concerning some of the concepts used; the phrase “Mischpolymerisation” (mixed polymerization) should be finally banned from scientific literature according to IUPAC rules. To describe the growth step of polymerizations as the “Polyadditionsschritt” (polyaddition step) (e.g . p. 16), is at least an error of judgement, since in German it can easily lead to confusion with other polyadditions occurring according to totally different mechanisms. These minor details d o not, however, detract from the book‘s value as an easily readable summary for a currently important area of macromolecular chemistry, particularly as the more than 600 literature references make it possible to delve deeper into the subject. A more serious deficiency-and one that must certainly be corrected in a new edition--is the absence of a subject index, particularly as the contents list is only crudely sectionalized. Dietrich Braun [NB 331 IE] IRSpektroskopie-Eine Einfuhrung. (Taschentext 43/44) (IR Spectroscopy-An Introduction. Pocket book 43/44). By H . Giinzler and H . Bock. Verlag Chemiephysik Verlag, Weinheim 1975. 1st edit., xv, 363 pp., 152 figs., 50 tables, paperback, DM 38.-. The main emphasis of this book is laid on the description of group frequencies of organic compounds, which are discussed very expertly with the aid of many original spectra and tables. Inorganic compounds are mentioned in only one sentence. Details of the apparatus, its maintenance, and of the preparation of samples are discussed at length; this part is of real practical value even for the experienced user, and treatment of special techniques takes up much space. 566 Theoretical principles up to the rotational vibration spectra of an anharmonic oscillator are treated in only 30 pages. Without givingany derivation the authors cite the Schrodinger equation as a kind of magic formula from which everything else can follow; here there are formulations that run from the unfortunate through the inexact to the false, and other chapters too are not free from them. Because of the weaknesses in its treatment of the theoretical principles and its concentration on applications in organic chemistry, this book is certainly no general introduction to IR spectroscopy. The limitation to organic compounds should have been stated in the title. Gerhard Lehmann [NB 332 IE] Fortschritte der Massenspektrometrie.Progress in Mass Spectrometry. Edited by H . Budzikiewicz. Vol. 3. Alkaloide, ausser Indol-Triterpen-, und Steroidalkaloide. By M . Hesse and H . P . Bernhard. Verlag Chemie, GmbH, Weinheim 1975. 1st edit., xvii, 372 pp., 112 figs., 83 tables, bound, DM 148.-. In order to take into account the complexity and structural variety of this group of natural products the authors confine themselves in this book in the Progress series[*] to the nitrogen compounds that are not classifiable as indole, triterpene, steroid, or ergot alkaloids. The classification principle for the remahing compounds-structurally considered still imposing in number-is based on the practicable but not always relevant assumption that in alkaloids the decompositions induced by electron impact generally start from ionized nitrogen. In consequence, therefore, the “nitrogen” structural element is set up as the centerpoint, while the traditional classification based on skeletal or chromophore type and on biogenetic relationships serve as secondary classification characteristics. The presentation of the immense volume of material succeeds by skilful choice and combination of line spectra, principal routes of decomposition, conclusions by analogy (allowed and forbidden), critical commentaries on spectral interpretation, and a comprehensive literature search (1082 references distributed over seven main chapters that in turn are subdivided into 125 fields). The authors have succeeded very well indeed in directing the reader rapidly and clearly (often with use of structural formulas) to the data relevant to analytical use by means of precise formulation and designation of key fragments. Mechanistic aspects are, in general, considered and used for spectral interpretation only insofar as they have been proved by experiment. In spite of the extensive data material involved (an index, arranged by molecular weight and names of 1260 compounds, as well as a comprehensive subject index allow rapid orientation), this book will not only be valuable to the typical alkaloid chemist but will also prove to be a (provocative) source for mechanistic studies, as repeatedly indicated by the authors’ views and limits. How helpful and important is well-based knowledge of the decomposition principles for a correct interpretation of the mass spectra of alkaloids is shown impressively by Chapter 6 (putrescine, spermidine, and spermine alkaloids). On the basis of studies of model compounds, carried out by the Zurich group, it is demonstrated, inter alia, that the apparent complexity of the mass spectra of these alkaloids is due to the simple interaction of nonbonded centers ( e . g . specific, reciprocal H-transfers or electron-impact-induced SNi reactions). The book constitutes an important addition to the standard works already available for chemists concerned with the analytical side of alkaloid chemistry. Helmut Schwarz [NB 333 IE] [*] Cf. Angew. Chem. Int. Ed. Engl. 15, 58 (1976).