Reactivity of boranes with a titanium(iv) amine tris(phenolate) alkoxide complex; formation of a Ti(iv) tetrahydroborate complex, a Ti(iii) dimer and a Ti(iv) hydroxide Lewis acid adduct

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Abstract

Treatment of the titanium(iv) alkoxide complex [Ti(OiPr)(OC6Me2H2CH2)3N] (2) with BH3·THF, as part of a study into the utility and reactivity of (2) in the metal mediated borane reduction of acetophenone, results in alkoxide–hydride exchange and formation of the structurally characterised titanium(iv) tetrahydroborate complex [Ti(BH4)(OC6Me2H2CH2)3N] (3). Complex (3) readily undergoes reduction to form the isolable titanium(iii) species [Ti(OC6Me2H2CH2)3N]2 (4). Reaction of (2) with B(C6F5)3 results in formation of the Lewis acid adduct [Ti(OC6Me2H2CH2)3N][HO·B(C6F5)3] (5). In comparison, treatment of the less sterically encumbered alkoxide Ti(OiPr)4 with B(C6F5)3 results in alkoxide–aryl exchange and formation of the organometallic titanium complex [Ti(OiPr)3(C6F5)]2 (6). The molecular structures of 3, 4, 5 and 6 have been determined by X-ray diffraction.

Original languageEnglish
Pages (from-to)5405-5411
Number of pages7
JournalDalton Transactions
Issue number46
DOIs
Publication statusPublished - 20 Nov 2006

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Boranes
Lewis Acids
Titanium
Dimers
Amines
Organometallics
Hydrides
Molecular structure
Ion exchange
Metals
X ray diffraction
hydroxide ion

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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title = "Reactivity of boranes with a titanium(iv) amine tris(phenolate) alkoxide complex; formation of a Ti(iv) tetrahydroborate complex, a Ti(iii) dimer and a Ti(iv) hydroxide Lewis acid adduct",
abstract = "Treatment of the titanium(iv) alkoxide complex [Ti(OiPr)(OC6Me2H2CH2)3N] (2) with BH3·THF, as part of a study into the utility and reactivity of (2) in the metal mediated borane reduction of acetophenone, results in alkoxide–hydride exchange and formation of the structurally characterised titanium(iv) tetrahydroborate complex [Ti(BH4)(OC6Me2H2CH2)3N] (3). Complex (3) readily undergoes reduction to form the isolable titanium(iii) species [Ti(OC6Me2H2CH2)3N]2 (4). Reaction of (2) with B(C6F5)3 results in formation of the Lewis acid adduct [Ti(OC6Me2H2CH2)3N][HO·B(C6F5)3] (5). In comparison, treatment of the less sterically encumbered alkoxide Ti(OiPr)4 with B(C6F5)3 results in alkoxide–aryl exchange and formation of the organometallic titanium complex [Ti(OiPr)3(C6F5)]2 (6). The molecular structures of 3, 4, 5 and 6 have been determined by X-ray diffraction.",
author = "Johnson, {Andrew L.} and Davidson, {Matthew G.} and Mahon, {Mary F.}",
note = "ID number: ISI:000251120300007",
year = "2006",
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doi = "10.1039/b708378e",
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journal = "Dalton Transactions",
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T1 - Reactivity of boranes with a titanium(iv) amine tris(phenolate) alkoxide complex; formation of a Ti(iv) tetrahydroborate complex, a Ti(iii) dimer and a Ti(iv) hydroxide Lewis acid adduct

AU - Johnson, Andrew L.

AU - Davidson, Matthew G.

AU - Mahon, Mary F.

N1 - ID number: ISI:000251120300007

PY - 2006/11/20

Y1 - 2006/11/20

N2 - Treatment of the titanium(iv) alkoxide complex [Ti(OiPr)(OC6Me2H2CH2)3N] (2) with BH3·THF, as part of a study into the utility and reactivity of (2) in the metal mediated borane reduction of acetophenone, results in alkoxide–hydride exchange and formation of the structurally characterised titanium(iv) tetrahydroborate complex [Ti(BH4)(OC6Me2H2CH2)3N] (3). Complex (3) readily undergoes reduction to form the isolable titanium(iii) species [Ti(OC6Me2H2CH2)3N]2 (4). Reaction of (2) with B(C6F5)3 results in formation of the Lewis acid adduct [Ti(OC6Me2H2CH2)3N][HO·B(C6F5)3] (5). In comparison, treatment of the less sterically encumbered alkoxide Ti(OiPr)4 with B(C6F5)3 results in alkoxide–aryl exchange and formation of the organometallic titanium complex [Ti(OiPr)3(C6F5)]2 (6). The molecular structures of 3, 4, 5 and 6 have been determined by X-ray diffraction.

AB - Treatment of the titanium(iv) alkoxide complex [Ti(OiPr)(OC6Me2H2CH2)3N] (2) with BH3·THF, as part of a study into the utility and reactivity of (2) in the metal mediated borane reduction of acetophenone, results in alkoxide–hydride exchange and formation of the structurally characterised titanium(iv) tetrahydroborate complex [Ti(BH4)(OC6Me2H2CH2)3N] (3). Complex (3) readily undergoes reduction to form the isolable titanium(iii) species [Ti(OC6Me2H2CH2)3N]2 (4). Reaction of (2) with B(C6F5)3 results in formation of the Lewis acid adduct [Ti(OC6Me2H2CH2)3N][HO·B(C6F5)3] (5). In comparison, treatment of the less sterically encumbered alkoxide Ti(OiPr)4 with B(C6F5)3 results in alkoxide–aryl exchange and formation of the organometallic titanium complex [Ti(OiPr)3(C6F5)]2 (6). The molecular structures of 3, 4, 5 and 6 have been determined by X-ray diffraction.

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