Photochemistry Of Organosulfur Compounds Reactions And Mechanisms Method 1 Investigation Of Free Radical Faths Of Photochemical Reactions Of Organo Sulfur Compounds 2 Investigation Of Structure And Interactions Of Proteins In Solutio
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Photochemistry of Organic Compounds
| Author | : Petr Klán |
| Publisher | : John Wiley & Sons |
| Total Pages | : 583 |
| Release | : 2009-03-23 |
| Genre | : Science |
| ISBN | : 1405190884 |
Photochemistry of Organic Compounds: From Concepts to Practice provides a hands-on guide demonstrating the underlying principles of photochemistry and, by reference to a range of organic reaction types, its effective use in the synthesis of new organic compounds and in various applications. The book presents a complete and methodical approach to the topic, Working from basic principles, discussing key techniques and studies of reactive intermediates, and illustrating synthetic photochemical procedures. Incorporating special topics and case studies covering various applications of photochemistry in chemistry, environmental sciences, biochemistry, physics, medicine, and industry. Providing extensive references to the original literature and to review articles. Concluding with a chapter on retrosynthetic photochemistry, listing key reactions to aid the reader in designing their own synthetic pathways. This book will be a valuable source of information and inspiration for postgraduates as well as professionals from a wide range of chemical and natural sciences.
Organic Photochemistry
| Author | : Jacques Kagan |
| Publisher | : Academic Press |
| Total Pages | : 241 |
| Release | : 2012-12-02 |
| Genre | : Science |
| ISBN | : 008098441X |
Organic Photochemistry outlines the principles, techniques and well-known reactions occurring in organic molecules and also illustrates more complex photochemical transformations occurring in organic chemistry. Many photochemical transformations convert simple molecules into extremely complex products with an ease not approached by the standard synthetic chemistry practiced in the laboratory. In the earlier chapters, the author outlines the principles, techniques and some of the well-known reactions occurring in organic molecules and later illustrates more complex photochemical transformations occuring in organic chemistry. Experimental techniques are included to encourage novices. Topics are emphasized where structural transformations can be formulated chemically. Practical applications are collected together. The book starts at a comfortably simple level with enough examples to provide an introduction to the diversity of photochemical reactions. Includes experimental techniques to encourage novices Emphasizes topics where structural transformations can be formulated chemically Collects and presents practical applications Written in a simple style including enough examples to serve as an introduction to the diversity of photochemical reactions
Handbook of Photochemistry of Organic Radicals
| Author | : Mikhail I︠A︡kovlevich Melʹnikov |
| Publisher | : Begell House Publishers |
| Total Pages | : 355 |
| Release | : 1996-01-01 |
| Genre | : Science |
| ISBN | : 9781567000719 |
The kinetics and mechanisms of reactions involving electronically excited radicals is a division of physical chemistry and high-energy chemistry, and was developed about 30 years ago. Advances in the field are closely related to the solution of fundamental problems concerning the theory of electronic structure and reactivity, as well as the practical tasks of using flash and laser light sources and the application of various materials in nuclear and aerospace engineering.
Molecular Reactions and Photochemistry
| Author | : Charles H. DePuy |
| Publisher | : Prentice Hall |
| Total Pages | : 172 |
| Release | : 1972 |
| Genre | : Science |
| ISBN | : |
Photochemistry and Internal Eliminations of Organosulfur and Organoselenium Compounds
| Author | : Ryan David McCulla |
| Publisher | : |
| Total Pages | : 622 |
| Release | : 2005 |
| Genre | : |
| ISBN | : |
This dissertation focuses on two specific aspects of the chemistry of organosulfur and organoselnium compounds. The first is the internal elimination of the sulfinate esters, sulfonic esters, and the effects of silyl-substitution on the internal elimination of sulfoxides. The internal elimination of sulfinate esters proceeds through a 5-membered transition state whereas sulfonate esters proceed through a 6-membered transition state. Using computations, it was determined in the 6-membered transition state that substantial charge separation occurs, but less charge separation is observed in the 5-membered transition state. The ability of the sulfonate leaving group to incorporate charge favors the 6-member transition state. In the 5-centered elimination, a nucleophilic-electrophilic mismatch in the transition state is made worse when the sulfur atom is more positively charged, as in the sulfonate. Silyl groups attached at either the C[subscript alpha] or C[subscript Beta] position of an alkyl sulfoxide lower the activation enthalpy of the sulfoxide syn elimination reaction by a few kcal mol−1. A Silyl substituent at C[Subscript Beta] can stabilize the transition state by either stabilizing the developing positive charge at C[subscript alpha] or negative charge at C[subscript Beta] . Silyl substitution at C[subscript alpha] is not positioned to interact favorably with either developing charge in the transition state, and the lower activation barrier is more likely a response to the overall less endothermic reaction than any silyl interaction in the transition state. The second topic is the photochemistry of organosulfur and organoselenium ylides. The photodeoxygenation of dibenzoselenophene oxide (DBSeO) was found to have a greater quantum efficiency in producing O(3P) than dibenzothiophene oxide (DBTO). However, the photosensitization and direct irradiation of DBTO (or DBSeO) were found to undergo photodeoxygenation by, in most cases, different mechanisms. Both of these conclusions were supported by monitoring the relative oxidized product ratios. Using calculations, the bond strengths of a variety of sulfur and selenium ylides were determined. This information is used in the elucidation of the photodeoxygenation mechanism of diaryl sulfoxides and selenoxides.
Sulfur-Centered Reactive Intermediates in Chemistry and Biology
| Author | : C. Chatgilialoglu |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 448 |
| Release | : 2013-03-08 |
| Genre | : Science |
| ISBN | : 1468458744 |
A wonderfully successful NATO Advanced Study Institute on "Sulfur-Centered Reactive Intermediates in Chemistry and Biology" was held 18-30 June, 1989, at the Hotel Villa del Mare in Maratea, Italy. Despite the beautiful setting with mountains behind us and over looking the clear blue Mediterranean Sea under a cloudless sky (and with a private beach available), the lectures were extremely well attended. While some credit can go to the seriousness of the students, more must go to the calibre of speakers and the high quality of C. Chatgilialoglu, and Co-Director, Professor K. -D. their presentations. The Director, Dr. Asmus, are to be congratulated for putting together such an outstanding scientific program. Dr. Chatgilialoglu is also to be commended for arranging an equally stimulating social pro gram which included bus, train and boat trips to many local sites of interest. It was particularly fitting that a meeting on the chemistry and biochemistry of sulfur should be held in Italy since Italian chemists have made major contributions to our under standing of the organic chemistry of sulfur, including the chemistry of its reactive inter mediates. The early Italian interest in sulfur chemistry arose from the fact that Italy, or more specifically, Sicily, was a major world producer of sulfur prior to the development and exploitation of the Frasch process in Texas and Louisiana.
Organic Chemistry of Sulfur
| Author | : S. Oae |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 714 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 1468420496 |
In recent years organic sulfur chemistry has been growing at an even faster pace than the very rapid development in other fields of chemistry. This phenomenal growth is undoubtedly a reflection of industrial and public demands: not only was sulfur recently in overall surplus for the first time in the history of the chemical industry but it has now become a prin cipal environmental hazard in the form of sulfur dioxide, sulfuric acid and hydrogen sulfide. Another reason, discernible in the last fifteen years, has been the desire, on the part of individual chemists and all types of research managers, to move away from the established chemistry of carbon into the less well understood and sometimes virgin chemistries of the other elements which form covalent bonds. As a result of this movement the last decade has seen the development of sulfur chemistry into a well-organized and now much better understood branch of organic chemistry. Enough of the detail has become clear to see mechanistic interrelationships between previously unconnected reactions and with this clarification the whole subject has in tum become systema tized and subdivided. The divalent sulfur chemistry of thiols, monosulfides, disulfides and polysulfides is a large area in itself, much of it devoted to oxidation-reduction and the breakage and formation of sulfur-sulfur bonds, although interesting discoveries are now being made about the reac tivity of certain sulfur-carbon bonds. Of course, this area has its own mas sive biochemical branch involving enzymes and proteins.
