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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/14772

Title: An Efficient and Reliable Procedure for the Preparation of Highly Reactive Rieke Zinc
Authors: Kudret, Suleyman
D' Haen, Jan
Lutsen, Laurence
Vanderzande, Dirk
Maes, Wouter
Issue Date: 2013
Publisher: WILEY-V C H VERLAG GMBH
Citation: ADVANCED SYNTHESIS & CATALYSIS, 355 (2-3), p. 569-575
Abstract: Rieke zinc has a wide potential for applications in organic chemistry, notably for the synthesis of highly chemoselective organozinc reagents. However, due to the rather unreliable preparation method, leading to large batch to batch variations, its use has been rather limited. Rieke zinc is commonly prepared by the reduction of zinc chloride with lithium using a stoichiometric amount of naphthalene. In our hands, it was observed that the reaction outcome was highly dependent on the naphthalene source and purity grade. The presence of benzothiophene seems crucial to avoid coagulation of the zinc particles and the amount of benzothiophene has a large effect on the physical properties and the reactivity of the resulting zinc powder. Accordingly, highly reactive Rieke zinc was easily prepared from zinc chloride by adding an optimum amount (3mol% with regard to ZnCl2) of benzothiophene into the lithium naphthalenide solution (prepared in situ). The Rieke zinc obtained in this way was successfully employed in the so-called Rieke method to prepare regioregular poly(3-hexylthiophene) (P3HT). The novel approach enables preparation of Rieke zinc in a reproducible manner, which considerably facilitates its use in both small molecule and polymer synthesis.
Notes: [Kudret, Suleyman; Vanderzande, Dirk; Maes, Wouter] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [D' Haen, Jan] Hasselt Univ, Inst Mat Res IMO, Elect & Phys Characterizat ELPHYC, B-3590 Diepenbeek, Belgium. [Lutsen, Laurence; Vanderzande, Dirk] IMEC, IMOMEC Ass Lab, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/14772
DOI: 10.1002/adsc.201201077
ISI #: 000314653800040
ISSN: 1615-4150
Category: A1
Type: Journal Contribution
Validation: ecoom, 2014
Appears in Collections: Research publications

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