Synthesis and oxidation catalysis of [tris(oxazolinyl)borato]cobalt(II) scorpionates

Reinig, Regina R.; Mukherjee, Debabrata; Weinstein, Zachary B.; Xie, Weiwei; Albright, Toshia; Baird, Benjamin; Gray, Tristan S.; Ellern, Arkady; Miller, Gordon J.; Winter, Arthur H.; Bud'ko, Sergey L.; Sadow, Aaron D.

doi:10.1002/ejic.201600237

Title: Synthesis and oxidation catalysis of [tris(oxazolinyl)borato]cobalt(II) scorpionates

Journal Article · Thu Apr 28 00:00:00 EDT 2016 · European Journal of Inorganic Chemistry

DOI:https://doi.org/10.1002/ejic.201600237· OSTI ID:1254318

Reinig, Regina R. ^[1]; Mukherjee, Debabrata ^[2]; Weinstein, Zachary B. ^[1]; Xie, Weiwei ^[1]; Albright, Toshia ^[2]; Baird, Benjamin ^[2]; Gray, Tristan S. ^[2]; Ellern, Arkady ^[2]; Miller, Gordon J. ^[1]; Winter, Arthur H. ^[2]; Bud'ko, Sergey L. ^[3]; Sadow, Aaron D. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)
Ames Lab., Ames, IA (United States)

The reaction of CoCl ₂ · THF and thallium tris(4,4‐dimethyl‐2‐oxazolinyl)phenylborate (TlTo ^M ) in tetrahydrofuran (THF) provides To ^M CoCl ( 1 ) in 95 % yield; however, appropriate solvents and starting materials are required to favor 1 over two other readily formed side‐products, (To ^M ) ₂ Co ( 2 ) and {HTo ^M }CoCl ₂ ( 3 ). ESR, NMR, FTIR, and UV/Vis spectroscopies were used to distinguish these cobalt(II) products and probe their electronic and structural properties. Even after the structures indicated by these methods were confirmed by X‐ray crystallography, the spectroscopic identification of trace contaminants in the material was challenging. The recognition of possible contaminants in the synthesis of To ^M CoCl in combination with the paramagnetic nature of these complexes provided impetus for the utilization of X‐ray powder diffraction to measure the purity of the To ^M CoCl bulk sample. The X‐ray powder diffraction results provide support for the bulk‐phase purity of To ^M CoCl in preparations that avoid 2 and 3 . Thus, 1 is a precursor for new [tris(oxazolinyl)borato]cobalt chemistry, as exemplified by its reactions with KO t Bu and NaOAc to give To ^M CoO t Bu ( 4 ) and To ^M CoOAc ( 5 ), respectively. Compound 5 is a catalyst for the oxidation of cyclohexane with meta ‐chloroperoxybenzoic acid ( m CPBA), and the rate constants and selectivity for cyclohexanol versus cyclohexanone and ε‐caprolactone were assessed.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1254318

Alternate ID(s):: OSTI ID: 1786419

Report Number(s):: IS-J-8973

Journal Information:: European Journal of Inorganic Chemistry, Journal Name: European Journal of Inorganic Chemistry; ISSN 1434-1948

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Rapid and ordered carbonylation and oxygenation of a cobalt( ii ) methyl Reinig, Regina R.; Fought, Ellie L.; Ellern, Arkady Chemical Communications, Vol. 53, Issue 80 https://doi.org/10.1039/c7cc06339c	journal	January 2017
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
scorpionates
oxazolines
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oxidation

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