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ERIC Number: EJ1228208
Record Type: Journal
Publication Date: 2019-Sep
Pages: 6
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: N/A
Syntheses of Four-Coordinate Nickel(II)-Phosphine Compounds and a Rapid Suzuki-Miyaura Cross-Coupling Reaction for Short Laboratory Sessions
Cooke, Jason
Journal of Chemical Education, v96 n9 p2009-2014 Sep 2019
[NiBr[subscript 2](PPh[subscript 3])[subscript 2]] and [NiBr[subscript 2](dppe)] are prepared from nickel bromide hydrate and phosphine. These brightly colored coordination compounds are then converted into the related organometallic compounds "trans"-[NiBr(Mes)(PPh[subscript 3])[subscript 2]] and [NiBr(Mes)(dppe)] (Mes = 2,4,6-Me[subscript 3]C[subscript 6]H[subscript 2]) by reaction with the Grignard reagent MesMgBr. Characterization of the compounds is accomplished by a combination of UV-vis and multinuclear NMR spectroscopies. [NiBr(Mes)(dppe)] is a highly active precatalyst for the Suzuki-Miyaura cross-coupling of 4'- bromoacetophenone and phenylboronic acid. The catalytic reaction is complete in as little as 15-20 min with only a 1 mol % precatalyst loading, and the reaction can be carried out in air. Results are assessed by [superscript 1]H NMR spectroscopy, or the solid 4-acetylbiphenyl product can be isolated following aqueous workup and recrystallization. The experiments are flexible and accommodate a variety of laboratory schedules and student skill levels. Each experimental component has been designed to be completed within a 3 h laboratory period.
Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A