摘要:

AbstractThe reliable interpretation of mass spectra for the determination of molecular constitutions requires systematic studies on the fragmentation behavior of classes of compounds, since the large number of kinetic and energy parameters that determine the decomposition of excited polyatomic ions makesab‐initiopredictions of spectra almost impossible. In this progress report, a number of general rules for the decomposition of organometallic complexes upon electron impact are discussed; a classification into decomposition types is also presented, and is illustrated by selected example

ISSN:0570-0833    

DOI:10.1002/anie.197206531

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractExploitation of the isotope effect using heavy metal isotopes now makes it possible to give clear‐cut assignments of the metal‐ligand vibrations in the IR and Raman spectra of complex compounds. The results previously obtained with this new method and their current limitations form the subject of this progress rep

ISSN:0570-0833    

DOI:10.1002/anie.197206661

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe number of possible applications of NMR spectroscopy has rapidly increased during the past few years. New fields of applications have been opened by the development of supraconducting solenoids and various spin‐decoupling techniques and by the method of “pulsed Fourier transform NMR‐spectroscopy”. These methods originate mainly from progress in instrumentation. Recently, another “technique” has been introduced into NMR spectroscopy, which—principally on the basis of chemical and spectroscopic experience—is much less expensive but nevertheless useful. The basic principles, background, and most important applications of this method, known as the “NMR‐shift‐reagent technique”, form th

ISSN:0570-0833    

DOI:10.1002/anie.197206751

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractIn the few short years since the discovery that organoboranes undergo facile free‐radical substitution, application of these reactions has become a major new area of synthetic utility. Organoboranes undergo a wide variety of free‐radical reactions such as autoxidation to the alcohol or hydroperoxide, 1, 4 addition to α,β‐unsaturated derivatives, addition to disulfides, and oxygen‐induced radical coupling. It is evident that organoboranes constitute a versatile new source of free radicals and that these reactions can be readily controlled to give very clean syntheses. The application of these reactions will be

ISSN:0570-0833    

DOI:10.1002/anie.197206921

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractFor thermodynamic reasons, biological hydroxylations cannot usually proceed according to the β‐oxidation scheme, but are possible only with the aid of molecular oxygen by a route requiring a large amount of energy. The corresponding enzymes, known as “mixed function oxygenases” or more appropriately “monooxygenases”, require two reduction equivalents for the activation of oxygen. The cytochrome P‐450‐dependent monooxygenases are taken as examples for the discussion of the chemistry of the enzymatic catalysis. The central problem of the activation of oxygen has not yet been solved, but an “oxenoid” mechanism can be deduced from mo

ISSN:0570-0833    

DOI:10.1002/anie.197207011

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197207132

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197207141

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197207151

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197207161

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197207171

出版商:Hüthig&Wepf Verlag    

年代:1972

数据来源: WILEY