NMR and the periodic system is the theme of a review by R. K . Harris. The author does not deal with ‘H-, “B-, I3C-, I9F-, and 3LP-NMR spectroscopy, but with the possibility of using more unusual nuclei in NMR studies. Suitable nuclei are those (like ‘H, I9F, and 31P) which have spin quantum number I = ‘I2,which occur in ca. 100 % natural purity, and which have a relatively high magnetic moment. Apart from the above mentioned nuclei only 89Y, Io3Rh, and ‘69Tm can fulfill these three conditions. But if nuclei with I > or natural purity < 100 % are also considered, there is at least one nucleus that comes into question in each group of the periodic system. [NMR and the Periodic Table. Chem. SOC.Rev. 5, 1-22 (1976); 81 references] [Rd 854 IE-F] Selective reductions with complex hydrides are discussed by E. R. H . Walker. NaBH4 and LiAIH, are universal reducing agents, but their selectivity leaves much to be desired. The author illustrates how the properties of the two reagents alter on changing the solvent, the cation, or replacing some of the hydrogen atoms. For example, LiBH4 can reduce esters and is thus a stronger reducing agent than NaBH,. The derivative LiBEt3H (“superhydride”) (1 ) is an extremely nucleophilic compound which rapidly reduces alkyl halides, but not aryl halides. Compound (2), M = Li or K, permits selective reductions. Alkoxy-substituted LiAlH,, e.g. lithium tris(tert-butoxy)hydridoaluminate is a mild reducing agent which selectively reduces acid chlorides to aldehydes. “RED-AL” (3) has practically the same reducing action as LiAIH,, but cannot be handled safely and conveniently. [The Functional Group Selectivity of Complex Hydride Reducing Agents. Chem. SOC. Rev. 5, 23-50 (1976); 64 references] [Rd 855 IE-F] Advances in thin-layer chromatography, particularly in direct combination with thermal procedures, are reviewed in an article by E . Stahl. Since the preparation of the sample is often more time-consuming than the actual analysis attempts have been made to develop “on-line” methods. In the simplest case a metal block with a hole bored in it to hold sample and container is used. The metal block is either preheated or heated according to a temperature program; if necessary, volatile components are fed onto a moving DC plate. [Advances in the Field of Thermal Procedures in Direct Combination with Thin-Layer Chromatography. Acc. Chem. Res. 9, 75-80 (1976); 42 references] [Rd 857 IE-L] BOOK REVIEWS Statistische Versuchsplanung (Statistical Planning of Experiments). By G. Retzlafi G . Rust, and J . Waibel. Verlag Chemie, GmbH, Weinheim 1975. 1st Edit., ix, 211 pp., 52 figs., 52 tables, bound D M 58.-. The aim of every experimenter is to make his object capable of visualization by physical concepts and if possible quantifiable by physical models. If, however, at the beginning of the investigation there is no physical representation, if the problem becomes very complex because of the many interfering factors and in addition the measurements are subject to considerable errors, or if a certain goal must be reached rapidly and without taking such considerations into account, then statistical planning of the experiment may be useful. The literature on this subject has so far suffered the disadvantage that it is written either in English or in a mathematical abstract form that is difficult for the chemist. The strength of the present book is that, right at the beginning, in about 40 pages, the technique of factorial experiment planning is explained in easily understandable form. Anyone who then has no wish to probe further will still know enough to be able, if necessary, to call in an expert. It is not quite clear why the authors failed to include the process of the steepest gradient (Box-Wilson method) and a suitable example. In the following two chapters the basic statistics (Chapter 3) are treated so far as is necessary for consideration of the error in factorial experiment planning (Chapter 4). Anyone with experience of the halfnormal plot will probably regret that this method is mentioned only in a footnote. Not all the subsequent chapters will interest the experimental chemist to the same extent. Reference should, however, be made to the chapter on regression calculation (Chapter 7) and the simplex method (in Chapter 9). Summarizing, it can be said that this book can be thoroughly recommended Angew. Chem. I n t . Ed. Engl. 1 Vol. 15 ( 1 9 7 6 ) N o . 6 to anyone who has to d o with the planning and evaluation of experiments. Otto Worz [NB 309 IE] Transport Phenomena. By W J . Beek and K . M . K . Muttzall. John Wiley & Sons. Ltd., London-New York 1975. 1st edit., x, 298 pp., numerous figs. and tables, bound, E 9.85. This book is based on a series of lectures. In four chapters it covers the fundamental laws of the transport of momentum, heat, and mass and demonstrates their importance by numerous important examples from process technology. Following the formulation of the conservation laws in Chapter 1, the principles of flow theory and dimensional analysis are discussed in Chapter 2, and these are then used to work through a large number of important problems (e.g. the pressure loss in pipelines of various geometrical shapes, flow measurement, flow through solid beds, fluidized beds, and residence-time distribution). Chapter 3 begins with a discussion of stationary and nonstationary heat conduction, the treatment including questions of heat transfer and heat transmission as well as various types of heat exchangers and problems of heat transfer during boiling and condensation. In the last chapter the laws of material transport are discussed, covering not merely stationary and nonstationary diffusion but also continuous material exchange in two-phase flows and the influence of diffusion on conversion in homogeneous and heterogeneous reactions. The book is impressive in the wealth of material offered, this being skilfully assembled so that, in conjunction with exercises tied to the text, it demands the reader’s active participation. Since working through the text does not require sophisticated mathematical knowledge, the book can be highly recommended as a course book alongside lectures on the 389 fundamentals of industrial processes. The many examples that keen Flose to Drgctice. treated bv peans of n u m e r o ~ s . t a b k . . ana aidgrams, ais6 proviae Srim’uiaiidnana n’eipto’me’pracris’-’ ing professional. Diethard Hesse [NB 314 IE] Einfuhrung in die Theoretische Chemie. Band 1: Quantenmechanische Grundlagen. (Introduction to Theoretical Chemistry. Vol. 1 : Quantum-Mechanical Principles.) By W Kutzelnigg. Verlag Chemie, GmbH, Weinheim 1975. 1st edit., xxiii, 297 pp., 23 figs., 9 tables, cloth, D M 68.-. It is general experience that familiarization with the principles of quantum mechanics proves particularly difficult for the chemist. Very closely connected with this is the usually uncritical, positive or negative, attitude adopted towards the numerical results of quantum-mechanical investigations, which are published today in such large numbers. In this book the author tries to play a mediating role; building on the smallest possible number of mathematical assumptions, he acquaints the reader progressively with the basic formalism and the most important methods and results of quantum mechanics. The approach has indeed been highly successful. Mathematical formulations going beyond the basic facts of differential and integral calculus, with which almost every student of chemistry is nowadays familiar, are given in the Appendix. A very commendable feature is that the author has made it a definite policy not to try to dodge difficulties. Knowledge that the reader does not already possess must be acquired during the study of each successive chapter. Accordingly, for those with little previous knowledge the book will undoubtedly be rather difficult reading. Some may regard the author’s concept of the extent of theoretical chemistry as rather too narrow. According to the list of contents, the second volume will provide a review of the theory of the chemical bond, the various methods of quantum chemistry, and the results of numerical calculations. The present volume is already directed to this end. The author quite consciously left aside anything that was not immediately relevant to his purpose. Time-dependent phenomena such as scat- tering processes and molecular collisions theory, tunneling Dhenomena. and theoretical attemDtg to describe chemical pimesses; as w eii-2s -conuirfitns--mme’~energycontihum ana ’ relativistic effects are not considered. The numerically evaluable approximation methods for the solution of the Schrodinger equation are naturally treated in great detail. After a brief section on the basic principles of classical mechanics essential for a description of atoms and molecules, the postulates of quantum mechanics are presented and some simple examples of exactly soluble Schrodinger equations are discussed. Here it should be emphasized that the author is always at pains to find the didactically most favorable formulation. For example, the eigenstates of a harmonic oscillator are derived with the aid of creation and annihilation operators, whereas in other cases conventional methods are preferred for the solution of differential equations. Several sections are devoted to angular momentum operators and their properties and to the hydrogen atom. Two further chapters treat the most important approximation methods of quantum mechanics, variational calculus and perturbation theory. The remaining six sections present a comprehensive theory of atoms that, starting from elementary models, leads up to, problems of spin-orbit coupling and electron correlation effects. Summarizing, this book can be described as an introduction, designed for chemists and eminently successful, to the fundamentals of quantum mechanics. Put together with great skill, the presentation moves in general along the conventional lines of textbooks in this field. It must be specially emphasized that the author really has succeeded in building on a very modest mathematical foundation, gradually leading the reader up to more difficult formalism. Account is taken of the latest developments in quantum chemistry by devoting great attention to the concepts needed for a deeper understanding of numerical methods of calculation. The book can be warmly recommended both to advanced students of chemistry and to trained chemists who wish to learn the fundamental facts of quantum mechanics and their applications in chemistry. Peter Schuster [NB 317 IE] Registered fumes. trademarks. etc. used in this journal, even without spec*c indication thereof, are not to be considered unprotected by law. Q Verlag Chemie. GmbH, D-6940 Weinheim, 1976. - Printed in Germany by Zechnersche Buchdruckerei. SpeyerIRhein. AU rights rescrved (including thow of translation into foreign languages). No part of this issue may be reproduced in any form - by pbotoprint, microfilm, or any other means - nor transmitted or translated into a machine language without written permission from the publishers. Only single copies of contributions, or parts thereof. may be reproduced lor personal use. Copies reproduced and used other than for private purposes in an industrial or commercial undertaking are subject to copyright and. in such cases, a copyright fee must be paid to the VG Wissenschah GmbH, Grosser Hirschgraben 17/21, FrankfurtIMain 1. from whom conditions of payment can be obtained on request. Editorial offie: Bosshstrasse 12, D-6940 Weinheim, Germany, Telephone 14036. Telex 465516 vchwh d . Editor: H . Criinewald. Translation Editon: A . 3. Rackstraw and A . Stimson Publishers: Verlag Chemie. GmbH. (Managing Directors liirgen Kreurhage and Hans Schemer) Pappelallee 3, D-6940 Weinheim, Germany and Academic Press Inc. (President Charles Hurt). 1 1 1 Fifth Avenue, New York 3, N . Y . . USA, and 24/28 Oval Road. London NW1. England Correspondence concerning advertisements should be addressed to Verlag Chemie. GmbH (Advertising Manager R. J . Roth). Pappelallee 3. P. 0.Box 1260/1280, D-6940 Weinheim, Germany. Telephone Weinheim (06201) 14031.Telex465516 vchwh d. 390 Angew. Chem. Int. Ed. Engl. Vol. I S (1976) No. 6

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