Mono- and di-cationic hydrido boron compounds

Rajendra S. Ghadwal; Christian J. Schürmann; Diego M. Andrada; Gernot Frenking

doi:10.1039/c5dt02237a

Mono- and di-cationic hydrido boron compounds

Rajendra S. Ghadwal, Christian J. Schürmann, Diego M. Andrada, Gernot Frenking

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29 Scopus citations

Abstract

Brønsted acid HNTf₂ (Tf = SO₂CF₃) mediated dehydrogenative hydride abstraction from (L¹)BH₃ (3) and (L²)BH₃ (4) (L¹ = IPrCH₂ = 1,3-(2,6-di-isopropylphenyl)imidazol-2-methylidene (1); L² = SIPrCH₂ = 1,3-(2,6-di-isopropylphenyl)imidazolidin-2-methylidiene (2)) affords thermally stable hydride bridged mono-cationic hydrido boron compounds [{(L¹)BH₂}₂(μ-H)](NTf₂) (5) and [{(L²)BH₂}₂(μ-H)](NTf₂) (6). Furthermore, hydride abstraction yields di-cationic hydrido boron compounds [{(L¹)BH}₂(μ-H)₂](NTf₂)₂ (7) and [{(L²)BH}₂(μ-H)₂](NTf₂)₂ (8). Unique cationic boron compounds with CH₂BH₂(μ-H)BH₂CH₂ (5 and 6) and CH₂BH(μ-H)₂BHCH₂ (7 and 8) moieties feature a 3c-2e bond and have been fully characterized. Interesting electronic and structural features of compounds 5-8 are analysed using spectroscopic, crystallographic, and computational methods.

Original language	English
Pages (from-to)	14359-14367
Number of pages	9
Journal	Dalton Transactions
Volume	44
Issue number	32
DOIs	https://doi.org/10.1039/c5dt02237a
State	Published - 28 Aug 2015
Externally published	Yes

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title = "Mono- and di-cationic hydrido boron compounds",

abstract = "Br{\o}nsted acid HNTf2 (Tf = SO2CF3) mediated dehydrogenative hydride abstraction from (L1)BH3 (3) and (L2)BH3 (4) (L1 = IPrCH2 = 1,3-(2,6-di-isopropylphenyl)imidazol-2-methylidene (1); L2 = SIPrCH2 = 1,3-(2,6-di-isopropylphenyl)imidazolidin-2-methylidiene (2)) affords thermally stable hydride bridged mono-cationic hydrido boron compounds [{(L1)BH2}2(μ-H)](NTf2) (5) and [{(L2)BH2}2(μ-H)](NTf2) (6). Furthermore, hydride abstraction yields di-cationic hydrido boron compounds [{(L1)BH}2(μ-H)2](NTf2)2 (7) and [{(L2)BH}2(μ-H)2](NTf2)2 (8). Unique cationic boron compounds with CH2BH2(μ-H)BH2CH2 (5 and 6) and CH2BH(μ-H)2BHCH2 (7 and 8) moieties feature a 3c-2e bond and have been fully characterized. Interesting electronic and structural features of compounds 5-8 are analysed using spectroscopic, crystallographic, and computational methods.",

author = "Ghadwal, {Rajendra S.} and Sch{\"u}rmann, {Christian J.} and Andrada, {Diego M.} and Gernot Frenking",

note = "Publisher Copyright: {\textcopyright} 2015 The Royal Society of Chemistry.",

year = "2015",

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doi = "10.1039/c5dt02237a",

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AU - Ghadwal, Rajendra S.

AU - Schürmann, Christian J.

AU - Andrada, Diego M.

AU - Frenking, Gernot

PY - 2015/8/28

Y1 - 2015/8/28

N2 - Brønsted acid HNTf2 (Tf = SO2CF3) mediated dehydrogenative hydride abstraction from (L1)BH3 (3) and (L2)BH3 (4) (L1 = IPrCH2 = 1,3-(2,6-di-isopropylphenyl)imidazol-2-methylidene (1); L2 = SIPrCH2 = 1,3-(2,6-di-isopropylphenyl)imidazolidin-2-methylidiene (2)) affords thermally stable hydride bridged mono-cationic hydrido boron compounds [{(L1)BH2}2(μ-H)](NTf2) (5) and [{(L2)BH2}2(μ-H)](NTf2) (6). Furthermore, hydride abstraction yields di-cationic hydrido boron compounds [{(L1)BH}2(μ-H)2](NTf2)2 (7) and [{(L2)BH}2(μ-H)2](NTf2)2 (8). Unique cationic boron compounds with CH2BH2(μ-H)BH2CH2 (5 and 6) and CH2BH(μ-H)2BHCH2 (7 and 8) moieties feature a 3c-2e bond and have been fully characterized. Interesting electronic and structural features of compounds 5-8 are analysed using spectroscopic, crystallographic, and computational methods.

AB - Brønsted acid HNTf2 (Tf = SO2CF3) mediated dehydrogenative hydride abstraction from (L1)BH3 (3) and (L2)BH3 (4) (L1 = IPrCH2 = 1,3-(2,6-di-isopropylphenyl)imidazol-2-methylidene (1); L2 = SIPrCH2 = 1,3-(2,6-di-isopropylphenyl)imidazolidin-2-methylidiene (2)) affords thermally stable hydride bridged mono-cationic hydrido boron compounds [{(L1)BH2}2(μ-H)](NTf2) (5) and [{(L2)BH2}2(μ-H)](NTf2) (6). Furthermore, hydride abstraction yields di-cationic hydrido boron compounds [{(L1)BH}2(μ-H)2](NTf2)2 (7) and [{(L2)BH}2(μ-H)2](NTf2)2 (8). Unique cationic boron compounds with CH2BH2(μ-H)BH2CH2 (5 and 6) and CH2BH(μ-H)2BHCH2 (7 and 8) moieties feature a 3c-2e bond and have been fully characterized. Interesting electronic and structural features of compounds 5-8 are analysed using spectroscopic, crystallographic, and computational methods.

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DO - 10.1039/c5dt02237a

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Mono- and di-cationic hydrido boron compounds

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