Can I read The Relation between Ion Pair Structures and Reactivities of Lithium Cuprates on EtoBox?

The Relation between Ion Pair Structures and Reactivities of Lithium Cuprates by Michael John; Carsten Auel; Christoph Behrens; Michael Marsch; Klaus Harms; Ferdinand Bosold; Ruth M. Gschwind; Pattuparambil R. Rajamohanan; Gernot Boche is a Chemistry article available to read on EtoBox.

What is The Relation between Ion Pair Structures and Reactivities of Lithium Cuprates about?

From Li well-solvating solvents or complex ligands such as THF, [12]crown-4, amines etc., lithium cuprates R 2 CuLi( . LiX) crystallise in a solvent-separated ion pair (SSIP) structural type (e.g. 10). In contrast, solvents with little donor qualities for Li such as diethyl ether or dimethyl sulfide lead to solid-state structures of the contact ion pair (CIP) type (e.g. 11). 1 H, 6 Li HOESY NMR investigations in solutions of R 2 CuLi( . LiX) (15, 16) are in agreement with these findings: in THF the SSIP 18 is strongly favoured in the equilibrium with the CIP 17, and in diethyl ether one observes essentially only the CIP 17. Salts LiX (X CN, Cl, Br, I, SPh) have only a minor effect on the ion pair equilibrium. These structural investigations correspond perfectly with Bertzs logarithmic reactivity profiles (LRPs) of reactions of R 2 CuLi with enones in diethyl ether and THF: the faster reaction in diethyl ether is due to the predominance of the CIP 17 in this solvent, which is the reacting species; in THF only little CIP 17 is present in a fast equilibrium with the SSIP 18. A kinetic analysis of the LRPs quantifies these findings. Recent quantum-chemical studies are also in agreement

Who reads The Relation between Ion Pair Structures and Reactivities of Lithium Cuprates?

Author

Michael John; Carsten Auel; Christoph Behrens; Michael Marsch; Klaus Harms; Ferdinand Bosold; Ruth M. Gschwind; Pattuparambil R. Rajamohanan; Gernot Boche

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0947-6539)

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)