Aachener Beiträge zur Chemie – serie
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Del 122 - Aachener Beiträge zur Chemie
Development of Methodologies in Organic Synthesis for Base-Catalysed C-C Bond Formation, Trifluoromethylthiolation and for Photocatalysis in Flow
Häftad, Engelska, 2015
558 kr
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Synthetic organic chemistry aims toward the development of methods for the practical synthesis of important molecules such as bioactive ingredients, pesticides, dyes, and polymers. Although extraction of organic molecules from natural resources is possible, organic synthesis often provides a cheaper and more practical access to them from readily accessible starting materials, as well as the possibility to artificially modify the structure of naturally-occurring molecules to increase their activity or modulate their properties. In medicinal chemistry, a standard approach to find the most potent active ingredient is the so-called combinatorial sythesis strategy: after identification of a promising structure, often a small molecule found in nature, a library of compounds with different substitution patterns is prepared and tested to find the bist hit.
Del 129 - Aachener Beiträge zur Chemie
Lewis Acidic Alkali Metal and Aluminum Complexes
Synthesis, Reactivity and Homogeneous Catalysis
Häftad, Engelska, 2018
558 kr
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Most industrial processes for producing bulk and fine chemicals are transition metal catalyzed. Toxicity and high cost of platinum group metals are triggering the current search for sustainable catalysts. In this regard, nontoxic and earth-abundant alkali metals could become attractive alternatives. They are the most electropositive elements of the periodic table. With a single s electron in the valence shell and a low ionization enthalpy they easily form M+ ions. The vacant, low-energy orbital of the M+ ion is capable of accepting an electron pair. This Lewis acidic property can be utilized in molecular catalysis. Since alkali metal compounds easily dimerize, oligomerize or even polymerize (Scheme A.1-1), suitable ligands are crucial for the isolation of defined metal complexes in their monomeric form.