The Everyday Blacksmith: Learn to Forge 55 Simple Projects You`ll Use Every Day, with Multiple Variations for Styles and Finishes, Wicks Nicholas
Автор: Wicks Joe Название: Lean in 15: The Sustain Plan ISBN: 1509820221 ISBN-13(EAN): 9781509820221 Издательство: Pan Macmillan Рейтинг: Цена: 1962.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: The third book in the Lean in 15 series by record-breaking bestselling author Joe Wicks.
Описание: Abstract: Cycloadditions involving fluoroallenes are extremely useful mechanistic probes. Due to the high reactivity of these allenes and the small size of their fluorine substituents, cycloadditions of fluoroallenes are free from many of the ambiguities surrounding analogous studies by previous workers. Styrene and 1,1-difluoroallene, DFA, undergo clean reactions between 60o and 100oC to give good yields (approx. 60%) of two cylcloadducts: 2,2-difluoro-3-phenyl-1-methylenecyclobutane (major) and 3-phenyl-1-(difluoromethylene)cyclobutane (minor). Similar experiments comparing the reactions of p-nitro and p-methoxystyrene with the above results give relative reactivities of 2.1 and 1.3, respectively. The 2]2] cycloaddition of DFA with Z-β-deuteriostyrene gives the expected products in an 82:18 ratio with stereochemical ratios of 58:42 and 79:21, respectively, at 80oC. A mechanism involving two kinetically distinguishable diradicals is proposed to rationalize the results. The reaction of DFA with 1-cyanovinyl acetate, a "capto-dative" reagent is also studied and found to give results similar to the styrene reactions. N-Methyl, N-phenyl, and N-(2-naphthyl)-C-phenylnitrones undergo regiospecific C2-C3 dipolar cycloadditions with monofluoroallene, MFA, in nearly quantitative yields at 25oC. The average stereochemical ratio for the two 4-substituted isoxazolidines produced is 84:16 2% with the product from syn addition of MFA in excess. The stereochemical assignments of the products are made with the aid of difference nuclear Overhauser effect (NOE) experiments and an X-ray crystal structure. Extensive solvent and kinetic studies show that these are well-behaved second-order kinetic processes consistent with previously well-studied 1,3-dipolar cycloadditions. The reaction of MFA with diazomethane-d2 strongly favors the product from the syn addition (88:12 ratio), also. Consideration of transition-state dipole-dipole interactions and solvation phenomena show that the factors affecting the stereochemical outcome of all these 1,3-dipolar cycloadditions are extremely subtle. Finally, MFA undergoes Diels-Alder reactions with cyclopentadiene, butadiene, and furan to give a modest preference for the syn adduct (51:49, 59:41, and 63:37, respectively). The results are discussed in terms of a theoretical study done for MFA using INDO calculations. Dissertation Discovery Company and University of Florida are dedicated to making scholarly works more discoverable and accessible throughout the world. This dissertation, "Stereochemical and Reactivity Studies of the 2 2], 2 4] and 1,3-dipolar Cycloadditions of Partially Fluorinated Allenes" by Gene Ellis Wicks, was obtained from University of Florida and is being sold with permission from the author. A digital copy of this work may also be found in the university's institutional repository, IR@UF. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation.
Автор: Wicks Joe Название: Lean in 15 ISBN: 1509800662 ISBN-13(EAN): 9781509800667 Издательство: Pan Macmillan Рейтинг: Цена: 2310.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: The first book from Instagram sensation Joe Wicks, aka The Body Coach.
Автор: Matthew Wicks Название: Imaginative Projects Book ISBN: 0521668050 ISBN-13(EAN): 9780521668057 Издательство: Cambridge University Press Рейтинг: Цена: 2588.00 р. Наличие на складе: Нет в наличии.
Описание: Imaginative Projects is a photocopiable supplementary resource book for teachers of EFL learners aged 11-17. This book provides a bank of ten projects, on themes designed to capture the imagination of students and encourage them to use English naturally in groups to work on the project’s end product such as a poster, radio programme, or performance.
This flexible material is linked to coursebook topics and language areas. Eight of the projects consist of four single lesson 'mini projects' that can be used independently.
It offers step-by-step teaching notes, a cross-referenced map of the book and a mini-map at the start each project.
If you need a motivating, enjoyable alternative to supplement your coursebook, this is the book for you.
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