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The Chemistry of Zirconacycles and 2,6-Diazasemibullvalenes - Synthesis, Structures, Reactions, and Applications in the Synthesis of Novel N-Heterocycles (Hardcover) Loot Price: R3,512
Discovery Miles 35 120
The Chemistry of Zirconacycles and 2,6-Diazasemibullvalenes - Synthesis, Structures, Reactions, and Applications in the...

The Chemistry of Zirconacycles and 2,6-Diazasemibullvalenes - Synthesis, Structures, Reactions, and Applications in the Synthesis of Novel N-Heterocycles (Hardcover)

Shaoguang Zhang

Series: Springer Theses

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Loot Price R3,512 Discovery Miles 35 120 | Repayment Terms: R329 pm x 12*

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In this thesis, the author introduces two strategies used to construct various types of N-heterocycles, based on the chemistry of zirconacycles and 2,6-diazasemibullvalenes. In the first part, the author presents the development of multi-component cyclization of a zirconacyclobutene-silacyclobutene fused compound, nitriles and unsaturated compounds. These reactions provide synthetically useful methodology for various N-heterocycles such as 3-acyl pyrrole, pyrrolo[3,2-d]pyridazine and dihydropyrroloazepine, which are all difficult to synthesize by other means. The isolation and characterization of the key three-fused-ring Zr/Si-containing intermediates are also described in detail. These results show that the zirconacyclobutene-silacyclobutene fused compound behaves as a "chemical transformer" upon treatment with various substrates via the "coordination-induced skeleton rearrangement" mechanism. In the second part, the author demonstrates the synthesis and isolation of a series of 2,6-diazasemibullvalenes (NSBVs) from the reaction of 1,4-dilithio-1,3-dienes and nitriles, highlighting the significant progress made for the first time in this work: (1) determination of X-ray crystal structure of a substituted 2,6-diazasemibullvalene; (2) measurement of the activation barrier of its rapid intramolecular aza-Cope rearrangement in solution; (3) exploration of several reaction types of NSBV with diverse ring-expansion products and "bowl-shape" or "cage-shape" N-containing polycyclic skeletons; (4) demonstration of the localized structure as the predominant form and the homoaromatic delocalized structure as a minor component in the equilibrium using theoretical analysis. Based on well-founded results, this work sheds new light on this controversial topic.

General

Imprint: Springer-Verlag
Country of origin: Germany
Series: Springer Theses
Release date: November 2014
First published: 2015
Authors: Shaoguang Zhang
Dimensions: 235 x 155 x 18mm (L x W x T)
Format: Hardcover
Pages: 173
ISBN-13: 978-3-662-45020-8
Categories: Books > Science & Mathematics > Physics > States of matter > Condensed matter physics (liquids & solids)
Books > Science & Mathematics > Chemistry > Organic chemistry > Organometallic chemistry
Books > Science & Mathematics > Chemistry > Physical chemistry > Quantum & theoretical chemistry
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LSN: 3-662-45020-8
Barcode: 9783662450208

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