The organic chemist who wishes to learn how to use NMR spectra effectively must first learn the essential facts and then must gain both ability and confidence through the solution of a wide range of specific problems. My previous volume, Interpretation of NMR Spectra: An Empirical Approach, was written specifically to present and explain the necessary background material. The present volume is designed to provide the reader with a full range of experience in the interpretation of NMR spectra. The exercises are arranged in a sequence designed for rapid assimila tion of not only the basic concepts, but also increasingly more complex details. Emphasis is placed on the difficulties normally encountered in the use of spectra and also on the many practical aids which are helpful in overcoming these difficulties. For most of the problems, at least one reasoning process is outlined by which the questions can be answered. This text is, in part, an outgrowth of my participation in workshops which were held at Canisius College under the direction of Dr. Herman Szymanski and at the College of Pharmacy of the University of Illinois under the direction of Dr. Charles L. Bell v and Dr. Ludwig Bauer. This experience has been of considerable aid in the formulation of this workbook. Most of the spectra used in this book were obtained by Searle staff members in the course of their own research.
In writing this book I had two main objectives: (1) to teach the organic chemist how to interpret proton magnetic resonance spectra, and (2) to provide the reference data which are constantly needed in the use of proton spectra. I have felt that it was im portant to point out not only the information which can be gained from spectra, but also the limitations and the potential pitfalls. All of the important facts are organized into tabular summaries. Every effort has been made to present the material clearly, con cisely, completely, and accurately. At the same time, subjects not directly related to the interpretation of spectra have been omitted. Thus, while the conclusions drawn from theory are presented, the theory itself has been avoided. There are a number of advantages in learning the empirical facts before learning the theory. First of all, in interpreting spectra one usually has to rely on his knowledge of the accumulated empirical correlations much more than on his knowledge of the theory. In fact, one could know all of the theory and still not b~ able to interpret spectra unless he also knew the empirical facts. Secondly, the theory is much more easilyunderstoodafter the facts have been mastered.
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