دانلود کتاب NMR عملی ضروری برای شیمی آلی

This second edition of Essential Practical NMR for Organic Chemistry is an updated and improved version of the first edition which was a follow-up to the original Laboratory Guide to Proton NMR Spectroscopy (Blackwell Scientific Publications, 1988). It follows the same informal approach and is hopefully fun to read as well as a useful guide. While still concentrating on proton NMR, it includes 2-D approaches and some heteronuclear examples (specifically 13C, 15N and 19F). This new edition now contains a comprehensive chapter on 15N which we have found increasingly important in the last decade. The greater coverage is devoted to the techniques that you will be likely to make most use of. The book is here to help you select the right experiment to solve your problem and to then interpret the results correctly. NMR is a funny beast – it throws up surprises no matter how long you have been doing it (at this point, it should be noted that the authors have more than 80 years of NMR experience between them and we still get surprises now and then!). The strength of NMR, particularly in the small organic molecule area, is that it is very information rich but ironically, this very high density of information can itself create problems for the less experienced practitioner. Information overload can be a problem and we hope to redress this by advocating an ordered approach to handling NMR data. There are huge subtleties in looking at this data; chemical shifts, splitting patterns, integrals, linewidths all have an existence due to physical molecular processes and they each tell a story about the atoms in the molecule. There is a reason for everything that you observe in a spectrum and the better your understanding of spectroscopic principles, the greater can be your confidence in your interpretation of the data in front of you. So, who is this book aimed at? Well, it contains useful information for anyone involved in using NMR as a tool for solving structural problems. It is particularly useful for chemists who have to run and look at their own NMR spectra and also for people who have been working in small molecule NMR for a relatively short time (less than 20 years, say;-)… It is focused on small organic molecule work (molecular weight less than 1500, commonly about 300). Ultimately, the book is pragmatic – we discuss cost-effective experiments to solve chemical structure problems as quickly as possible. It deals with some of the unglamorous bits, like making up your sample. These are necessary if dull. It also looks at the more challenging aspects of NMR. While the book touches on some aspects of NMR theory, the main focus of the text is firmly rooted in data acquisition, problem-solving strategy and interpretation. If you find yourself wanting to know more about aspects of theory, we suggest the excellent, High-Resolution NMR Techniques in Organic Chemistry by Timothy D. W. Claridge (Elsevier, ISBN-13: 978–0-08– 054818-0) as an approachable next step before delving into the even more theoretical works. Another really good source is Joseph P. Hornak’s ‘The Basics of NMR’ website (you can find it by putting ‘hornak nmr’ into your favourite search engine). While writing these chapters, we have often fought with the problem of statements that are partially true and debated whether to insert a qualifier. To get across the fundamental ideas we have tried to minimise the disclaimers and qualifiers. This aids clarity, but be aware, almost everything is more complicated than it first appears! Forty years in NMR has been fun. The amazing thing is that it is still fun…and challenging… and stimulating even now! Please note that all spectra included in this book were acquired at 400 MHz unless otherwise stated.