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New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations

By (author) Xiangyu Chen

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This thesis focuses on NHC-catalyzed annulation of nitroalkenes, enals and Î±,Î²-unsaturated carboxylic acids. (1) NHCs were found to be efficient catalysts for the [4+2] annulation of Î²-substituted nitroalkenes. The scope of Rauhutâ€“Currier reaction was successfully extended to the most challenging Î²-substituted alkenes by this method; (2) Enals were successfully used for [4+2] annulations with azodicarboxylates catalyzed by NHC via Î³-addition. Highly enantiopure tetrahydropyridazinones and Î³-amino acid derivatives could be easily prepared by subsequent transformations of the resulting dihydropyridazinones. (4) The readily available Î±,Î²-unsaturated carboxylic acids were first successfully employed to generate the Î±,Î²-unsaturated acyl azolium intermediates by using NHC for the enantioselective [3+2] and [3+3] annulations.

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Fifteen Dogs

AndrÃ© Alexis
Paperback / softback
176 pages
was: R 280.95
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A pack of dogs are granted the power of human thought - but what will it do to them? A surprising and insightful look at the beauty and perils of consciousness.

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The Ballerina and the Bull: Anarchist Utopias in the Age of Finance

Johanna Isaacson
Paperback / softback
288 pages
was: R 306.95
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Our moment has seen the resurgence of an anarchist sensibility, from the uprisings in Seattle in 1999 to the Occupy movement of 2011.

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Bonsai Success in Southern Africa

Carl Morrow
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160 pages
was: R 320.95
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In this uniquely Southern African book, Carl Morrow and Keith Kirsten guide readers step by step into the magical realms of bonsai as a hobby, horticultural practice and art form.

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