C-F Bond activation at Ni(0) and simple reactions of square planar Ni(II) fluoride complexes

Suzanne Burling, Paul I P Elliott, Naser A. Jasim, Richard J. Lindup, Jennifer McKenna, Robin N. Perutz, Stephen J. Archibald, Adrian C. Whitwood

Research output: Contribution to journalArticle

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Abstract

The reaction of Ni(COD)2 (COD = 1,5-cyclooctadiene) with triethylphosphine and pentafluoropyridine in hexane has been shown previously to yield trans-[NiF(2-C5NF4)(PEt3)2] (1a) with a preference for reaction at the 2-position of the heteroaromatic. The corresponding reaction with 2,3,5,6-tetrafluoropyridine was shown to yield trans-[NiF(2-C5NF3H)(PEt3)2] (1b). In this paper, we show that reaction of Ni(COD)2 with triethylphosphine and pentafluoropyridine in THF yields a mixture of 1a and 1b. Competition reactions of Ni(COD)2 with triethylphosphine in the presence of mixtures of heteroaromatics in hexane reveal a kinetic preference of k(pentafluoropyridine) : k(2,3,5,6-tetrafluoropyridine) = 5.4 : 1. Treatment of 1a and 1b with Me3SiN3 affords trans-[Ni(N 3)(2-C5NF4)(PEt3)2] (2a) and trans-[Ni(N3)(2-C5NHF3)(PEt 3)2] (2b), respectively. The complex trans-[Ni(NCO)(2- C5NHF3)(PEt3)2] (3b) is obtained on reaction of 1b with Me3SiNCO and by photolysis of 2b under CO, while trans-[Ni(η1-C≡CPh)(2-C5NF4)(PEt 3)2] (4a) is obtained by reaction of phenylacetylene with 1a. Addition of KCN, KI and NaOAc to complex 1a affords trans-[Ni(X)(2-C 5NF4)(PEt3)2] (5a X = CN, 6a X = I, 7a X = OAc), respectively. The PEt3 groups of complex 1a are readily replaced by addition of 1,2-bis(dicyclohexylphosphino)ethane (dcpe) to produce [NiF(2-C5F4N)(dcpe)] (8a). Addition of dcpe to trans-[Ni(OTf)(2-C5F4N)(PEt3)2] (10a), however, yields the salt [Ni(2-C5F4N)(dcpe) (PEt3)](OTf) (9a) by substitution of only one PEt3 and displacement of the triflate ligand. The structures of 2b, 4a, 7a and 8a were determined by X-ray crystallography. The influence of different ancillary ligands on the bond lengths and angles of square-planar nickel structures with polyfluoropyridyl ligands is analysed.

LanguageEnglish
Pages3686-3695
Number of pages10
JournalDalton Transactions
Issue number22
DOIs
Publication statusPublished - 21 Nov 2005
Externally publishedYes

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Ethane
Fluorides
Chemical activation
Hexanes
Ligands
X ray crystallography
Photolysis
Bond length
Carbon Monoxide
Nickel
Substitution reactions
Salts
Kinetics
pentafluoropyridine

Cite this

Burling, S., Elliott, P. I. P., Jasim, N. A., Lindup, R. J., McKenna, J., Perutz, R. N., ... Whitwood, A. C. (2005). C-F Bond activation at Ni(0) and simple reactions of square planar Ni(II) fluoride complexes. Dalton Transactions, (22), 3686-3695. https://doi.org/10.1039/b510052f
Burling, Suzanne ; Elliott, Paul I P ; Jasim, Naser A. ; Lindup, Richard J. ; McKenna, Jennifer ; Perutz, Robin N. ; Archibald, Stephen J. ; Whitwood, Adrian C. / C-F Bond activation at Ni(0) and simple reactions of square planar Ni(II) fluoride complexes. In: Dalton Transactions. 2005 ; No. 22. pp. 3686-3695.
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abstract = "The reaction of Ni(COD)2 (COD = 1,5-cyclooctadiene) with triethylphosphine and pentafluoropyridine in hexane has been shown previously to yield trans-[NiF(2-C5NF4)(PEt3)2] (1a) with a preference for reaction at the 2-position of the heteroaromatic. The corresponding reaction with 2,3,5,6-tetrafluoropyridine was shown to yield trans-[NiF(2-C5NF3H)(PEt3)2] (1b). In this paper, we show that reaction of Ni(COD)2 with triethylphosphine and pentafluoropyridine in THF yields a mixture of 1a and 1b. Competition reactions of Ni(COD)2 with triethylphosphine in the presence of mixtures of heteroaromatics in hexane reveal a kinetic preference of k(pentafluoropyridine) : k(2,3,5,6-tetrafluoropyridine) = 5.4 : 1. Treatment of 1a and 1b with Me3SiN3 affords trans-[Ni(N 3)(2-C5NF4)(PEt3)2] (2a) and trans-[Ni(N3)(2-C5NHF3)(PEt 3)2] (2b), respectively. The complex trans-[Ni(NCO)(2- C5NHF3)(PEt3)2] (3b) is obtained on reaction of 1b with Me3SiNCO and by photolysis of 2b under CO, while trans-[Ni(η1-C≡CPh)(2-C5NF4)(PEt 3)2] (4a) is obtained by reaction of phenylacetylene with 1a. Addition of KCN, KI and NaOAc to complex 1a affords trans-[Ni(X)(2-C 5NF4)(PEt3)2] (5a X = CN, 6a X = I, 7a X = OAc), respectively. The PEt3 groups of complex 1a are readily replaced by addition of 1,2-bis(dicyclohexylphosphino)ethane (dcpe) to produce [NiF(2-C5F4N)(dcpe)] (8a). Addition of dcpe to trans-[Ni(OTf)(2-C5F4N)(PEt3)2] (10a), however, yields the salt [Ni(2-C5F4N)(dcpe) (PEt3)](OTf) (9a) by substitution of only one PEt3 and displacement of the triflate ligand. The structures of 2b, 4a, 7a and 8a were determined by X-ray crystallography. The influence of different ancillary ligands on the bond lengths and angles of square-planar nickel structures with polyfluoropyridyl ligands is analysed.",
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Burling, S, Elliott, PIP, Jasim, NA, Lindup, RJ, McKenna, J, Perutz, RN, Archibald, SJ & Whitwood, AC 2005, 'C-F Bond activation at Ni(0) and simple reactions of square planar Ni(II) fluoride complexes', Dalton Transactions, no. 22, pp. 3686-3695. https://doi.org/10.1039/b510052f

C-F Bond activation at Ni(0) and simple reactions of square planar Ni(II) fluoride complexes. / Burling, Suzanne; Elliott, Paul I P; Jasim, Naser A.; Lindup, Richard J.; McKenna, Jennifer; Perutz, Robin N.; Archibald, Stephen J.; Whitwood, Adrian C.

In: Dalton Transactions, No. 22, 21.11.2005, p. 3686-3695.

Research output: Contribution to journalArticle

TY - JOUR

T1 - C-F Bond activation at Ni(0) and simple reactions of square planar Ni(II) fluoride complexes

AU - Burling, Suzanne

AU - Elliott, Paul I P

AU - Jasim, Naser A.

AU - Lindup, Richard J.

AU - McKenna, Jennifer

AU - Perutz, Robin N.

AU - Archibald, Stephen J.

AU - Whitwood, Adrian C.

PY - 2005/11/21

Y1 - 2005/11/21

N2 - The reaction of Ni(COD)2 (COD = 1,5-cyclooctadiene) with triethylphosphine and pentafluoropyridine in hexane has been shown previously to yield trans-[NiF(2-C5NF4)(PEt3)2] (1a) with a preference for reaction at the 2-position of the heteroaromatic. The corresponding reaction with 2,3,5,6-tetrafluoropyridine was shown to yield trans-[NiF(2-C5NF3H)(PEt3)2] (1b). In this paper, we show that reaction of Ni(COD)2 with triethylphosphine and pentafluoropyridine in THF yields a mixture of 1a and 1b. Competition reactions of Ni(COD)2 with triethylphosphine in the presence of mixtures of heteroaromatics in hexane reveal a kinetic preference of k(pentafluoropyridine) : k(2,3,5,6-tetrafluoropyridine) = 5.4 : 1. Treatment of 1a and 1b with Me3SiN3 affords trans-[Ni(N 3)(2-C5NF4)(PEt3)2] (2a) and trans-[Ni(N3)(2-C5NHF3)(PEt 3)2] (2b), respectively. The complex trans-[Ni(NCO)(2- C5NHF3)(PEt3)2] (3b) is obtained on reaction of 1b with Me3SiNCO and by photolysis of 2b under CO, while trans-[Ni(η1-C≡CPh)(2-C5NF4)(PEt 3)2] (4a) is obtained by reaction of phenylacetylene with 1a. Addition of KCN, KI and NaOAc to complex 1a affords trans-[Ni(X)(2-C 5NF4)(PEt3)2] (5a X = CN, 6a X = I, 7a X = OAc), respectively. The PEt3 groups of complex 1a are readily replaced by addition of 1,2-bis(dicyclohexylphosphino)ethane (dcpe) to produce [NiF(2-C5F4N)(dcpe)] (8a). Addition of dcpe to trans-[Ni(OTf)(2-C5F4N)(PEt3)2] (10a), however, yields the salt [Ni(2-C5F4N)(dcpe) (PEt3)](OTf) (9a) by substitution of only one PEt3 and displacement of the triflate ligand. The structures of 2b, 4a, 7a and 8a were determined by X-ray crystallography. The influence of different ancillary ligands on the bond lengths and angles of square-planar nickel structures with polyfluoropyridyl ligands is analysed.

AB - The reaction of Ni(COD)2 (COD = 1,5-cyclooctadiene) with triethylphosphine and pentafluoropyridine in hexane has been shown previously to yield trans-[NiF(2-C5NF4)(PEt3)2] (1a) with a preference for reaction at the 2-position of the heteroaromatic. The corresponding reaction with 2,3,5,6-tetrafluoropyridine was shown to yield trans-[NiF(2-C5NF3H)(PEt3)2] (1b). In this paper, we show that reaction of Ni(COD)2 with triethylphosphine and pentafluoropyridine in THF yields a mixture of 1a and 1b. Competition reactions of Ni(COD)2 with triethylphosphine in the presence of mixtures of heteroaromatics in hexane reveal a kinetic preference of k(pentafluoropyridine) : k(2,3,5,6-tetrafluoropyridine) = 5.4 : 1. Treatment of 1a and 1b with Me3SiN3 affords trans-[Ni(N 3)(2-C5NF4)(PEt3)2] (2a) and trans-[Ni(N3)(2-C5NHF3)(PEt 3)2] (2b), respectively. The complex trans-[Ni(NCO)(2- C5NHF3)(PEt3)2] (3b) is obtained on reaction of 1b with Me3SiNCO and by photolysis of 2b under CO, while trans-[Ni(η1-C≡CPh)(2-C5NF4)(PEt 3)2] (4a) is obtained by reaction of phenylacetylene with 1a. Addition of KCN, KI and NaOAc to complex 1a affords trans-[Ni(X)(2-C 5NF4)(PEt3)2] (5a X = CN, 6a X = I, 7a X = OAc), respectively. The PEt3 groups of complex 1a are readily replaced by addition of 1,2-bis(dicyclohexylphosphino)ethane (dcpe) to produce [NiF(2-C5F4N)(dcpe)] (8a). Addition of dcpe to trans-[Ni(OTf)(2-C5F4N)(PEt3)2] (10a), however, yields the salt [Ni(2-C5F4N)(dcpe) (PEt3)](OTf) (9a) by substitution of only one PEt3 and displacement of the triflate ligand. The structures of 2b, 4a, 7a and 8a were determined by X-ray crystallography. The influence of different ancillary ligands on the bond lengths and angles of square-planar nickel structures with polyfluoropyridyl ligands is analysed.

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