Boron-boron bond oxidative addition to rhodium(I) and iridium(I) centres

William Clegg, Fiona J. Lawlor, Todd B. Marder, Paul Nguyen, Nicholas C. Norman, A. Guy Orpen, Michael J. Quayle, Craig R. Rice, Edward G. Robins, Andrew J. Scott, Fabio E.S. Souza, Graham Stringer, George R. Whittell

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The reaction between the diborane(4) compound B2(1,2-O2C6H4)2 and either of the rhodium(I) complexes [RhCl(PPh3)3] or [{Rh(μ-Cl)(PPh3)2}2] afforded the colourless rhodium(III) bis(boryl) species [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2]. Similar reactions have been carried out with the diborane(4) compounds B2(1,2-O2-4-ButC6H3) 2, B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2, B2(1,2-O2-4-MeC6H3)2, B2(1,2-O2-3-MeOC6H3)2, B2(1,2-S2C6H4)2, B2(1,2-S2-4-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH(CO 2Me)]2 affording analogous rhodium complexes all of which have been characterised spectroscopically. The complexes derived from the reactions with B2(1,2-O2C6H4)2 and B2(1,2-O2-3-MeC6H3)2 have also been characterised by X-ray crystallography, the structures comprising a five-co-ordinate rhodium centre with a square-based-pyramidal geometry in which the apical site is occupied by a boryl group and the phosphines are mutually trims in basal positions. Reactivity studies have also been carried out for [RhCl(PPh3)2{B(1,2-O2C6H 4)}2]. Hydrolysis or alcoholysis with catechol afforded [RhH2Cl(PPh3)3] and either B2(1,2-O2C6H4)2(μ-O) or B2(1,2-O2C6H4)3 and addition of the phosphines PMe3, PEt3 and PMe2Ph afforded the new bis(boryl) compounds cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2], [RhCl(PEt3)2-{B(1,2-O2C6H 4)}2] and cis,mer-[RhCl(PMe2Ph)3{B(1,2-O2C 6H4)}2], the PEt3 complex having been characterised by X-ray crystallography and shown to be similar to the PPh3 complex. The iridium analogue [IrCl(PEt3)2-{B(1,2-O2C6H 4)}2] was also prepared from the reaction between [IrCl(PEt3)3] and B2(1,2-O2C6H4)2 and shown by X-ray crystallography to be isomorphous with the rhodium complex. Reactions between [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2] and the phosphines PPri 3, P(C6H11)3, 1,2-bis(diphenylphosphino)ethane (dppe) and 1,2-bis(dicyclohexylphosphino)ethane (dcpe) are also described although these do not result in new rhodium boryl complexes. The reaction between [{RhCl(dppe)}2] and B2(1,2-O2C6H4)2 afforded a compound tentatively assigned as [Rh(dppe)2{B(1,2-O2C6H4)}] with analogous compounds being formed with the diborane(4) compounds B2(1,2-O2-3-MeC6H3)2 and B2(1,2-O2-4-MeC6H3)2. Finally, the reaction between [Rh(PMe3)4]Cl and the diborane(4) compound B2(1,2-O2C6H4)2 is described which affords cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2]. Analogous reactions with B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH-(CO 2MeJ]2 afforded similar products.

LanguageEnglish
Pages301-309
Number of pages9
JournalJournal of the Chemical Society - Dalton Transactions
Issue number2
DOIs
Publication statusPublished - 21 Jan 1998
Externally publishedYes

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Iridium
Rhodium
Boron
Phosphines
Ethane
X ray crystallography
Carbon Monoxide
Hydrolysis
Geometry
diborane

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Clegg, W., Lawlor, F. J., Marder, T. B., Nguyen, P., Norman, N. C., Orpen, A. G., ... Whittell, G. R. (1998). Boron-boron bond oxidative addition to rhodium(I) and iridium(I) centres. Journal of the Chemical Society - Dalton Transactions, (2), 301-309. https://doi.org/10.1039/A705374F
Clegg, William ; Lawlor, Fiona J. ; Marder, Todd B. ; Nguyen, Paul ; Norman, Nicholas C. ; Orpen, A. Guy ; Quayle, Michael J. ; Rice, Craig R. ; Robins, Edward G. ; Scott, Andrew J. ; Souza, Fabio E.S. ; Stringer, Graham ; Whittell, George R. / Boron-boron bond oxidative addition to rhodium(I) and iridium(I) centres. In: Journal of the Chemical Society - Dalton Transactions. 1998 ; No. 2. pp. 301-309.
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title = "Boron-boron bond oxidative addition to rhodium(I) and iridium(I) centres",
abstract = "The reaction between the diborane(4) compound B2(1,2-O2C6H4)2 and either of the rhodium(I) complexes [RhCl(PPh3)3] or [{Rh(μ-Cl)(PPh3)2}2] afforded the colourless rhodium(III) bis(boryl) species [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2]. Similar reactions have been carried out with the diborane(4) compounds B2(1,2-O2-4-ButC6H3) 2, B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2, B2(1,2-O2-4-MeC6H3)2, B2(1,2-O2-3-MeOC6H3)2, B2(1,2-S2C6H4)2, B2(1,2-S2-4-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH(CO 2Me)]2 affording analogous rhodium complexes all of which have been characterised spectroscopically. The complexes derived from the reactions with B2(1,2-O2C6H4)2 and B2(1,2-O2-3-MeC6H3)2 have also been characterised by X-ray crystallography, the structures comprising a five-co-ordinate rhodium centre with a square-based-pyramidal geometry in which the apical site is occupied by a boryl group and the phosphines are mutually trims in basal positions. Reactivity studies have also been carried out for [RhCl(PPh3)2{B(1,2-O2C6H 4)}2]. Hydrolysis or alcoholysis with catechol afforded [RhH2Cl(PPh3)3] and either B2(1,2-O2C6H4)2(μ-O) or B2(1,2-O2C6H4)3 and addition of the phosphines PMe3, PEt3 and PMe2Ph afforded the new bis(boryl) compounds cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2], [RhCl(PEt3)2-{B(1,2-O2C6H 4)}2] and cis,mer-[RhCl(PMe2Ph)3{B(1,2-O2C 6H4)}2], the PEt3 complex having been characterised by X-ray crystallography and shown to be similar to the PPh3 complex. The iridium analogue [IrCl(PEt3)2-{B(1,2-O2C6H 4)}2] was also prepared from the reaction between [IrCl(PEt3)3] and B2(1,2-O2C6H4)2 and shown by X-ray crystallography to be isomorphous with the rhodium complex. Reactions between [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2] and the phosphines PPri 3, P(C6H11)3, 1,2-bis(diphenylphosphino)ethane (dppe) and 1,2-bis(dicyclohexylphosphino)ethane (dcpe) are also described although these do not result in new rhodium boryl complexes. The reaction between [{RhCl(dppe)}2] and B2(1,2-O2C6H4)2 afforded a compound tentatively assigned as [Rh(dppe)2{B(1,2-O2C6H4)}] with analogous compounds being formed with the diborane(4) compounds B2(1,2-O2-3-MeC6H3)2 and B2(1,2-O2-4-MeC6H3)2. Finally, the reaction between [Rh(PMe3)4]Cl and the diborane(4) compound B2(1,2-O2C6H4)2 is described which affords cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2]. Analogous reactions with B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH-(CO 2MeJ]2 afforded similar products.",
author = "William Clegg and Lawlor, {Fiona J.} and Marder, {Todd B.} and Paul Nguyen and Norman, {Nicholas C.} and Orpen, {A. Guy} and Quayle, {Michael J.} and Rice, {Craig R.} and Robins, {Edward G.} and Scott, {Andrew J.} and Souza, {Fabio E.S.} and Graham Stringer and Whittell, {George R.}",
year = "1998",
month = "1",
day = "21",
doi = "10.1039/A705374F",
language = "English",
pages = "301--309",
journal = "Journal of the Chemical Society. Dalton Transactions",
issn = "1472-7773",
publisher = "Royal Society of Chemistry",
number = "2",

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Clegg, W, Lawlor, FJ, Marder, TB, Nguyen, P, Norman, NC, Orpen, AG, Quayle, MJ, Rice, CR, Robins, EG, Scott, AJ, Souza, FES, Stringer, G & Whittell, GR 1998, 'Boron-boron bond oxidative addition to rhodium(I) and iridium(I) centres', Journal of the Chemical Society - Dalton Transactions, no. 2, pp. 301-309. https://doi.org/10.1039/A705374F

Boron-boron bond oxidative addition to rhodium(I) and iridium(I) centres. / Clegg, William; Lawlor, Fiona J.; Marder, Todd B.; Nguyen, Paul; Norman, Nicholas C.; Orpen, A. Guy; Quayle, Michael J.; Rice, Craig R.; Robins, Edward G.; Scott, Andrew J.; Souza, Fabio E.S.; Stringer, Graham; Whittell, George R.

In: Journal of the Chemical Society - Dalton Transactions, No. 2, 21.01.1998, p. 301-309.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Boron-boron bond oxidative addition to rhodium(I) and iridium(I) centres

AU - Clegg, William

AU - Lawlor, Fiona J.

AU - Marder, Todd B.

AU - Nguyen, Paul

AU - Norman, Nicholas C.

AU - Orpen, A. Guy

AU - Quayle, Michael J.

AU - Rice, Craig R.

AU - Robins, Edward G.

AU - Scott, Andrew J.

AU - Souza, Fabio E.S.

AU - Stringer, Graham

AU - Whittell, George R.

PY - 1998/1/21

Y1 - 1998/1/21

N2 - The reaction between the diborane(4) compound B2(1,2-O2C6H4)2 and either of the rhodium(I) complexes [RhCl(PPh3)3] or [{Rh(μ-Cl)(PPh3)2}2] afforded the colourless rhodium(III) bis(boryl) species [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2]. Similar reactions have been carried out with the diborane(4) compounds B2(1,2-O2-4-ButC6H3) 2, B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2, B2(1,2-O2-4-MeC6H3)2, B2(1,2-O2-3-MeOC6H3)2, B2(1,2-S2C6H4)2, B2(1,2-S2-4-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH(CO 2Me)]2 affording analogous rhodium complexes all of which have been characterised spectroscopically. The complexes derived from the reactions with B2(1,2-O2C6H4)2 and B2(1,2-O2-3-MeC6H3)2 have also been characterised by X-ray crystallography, the structures comprising a five-co-ordinate rhodium centre with a square-based-pyramidal geometry in which the apical site is occupied by a boryl group and the phosphines are mutually trims in basal positions. Reactivity studies have also been carried out for [RhCl(PPh3)2{B(1,2-O2C6H 4)}2]. Hydrolysis or alcoholysis with catechol afforded [RhH2Cl(PPh3)3] and either B2(1,2-O2C6H4)2(μ-O) or B2(1,2-O2C6H4)3 and addition of the phosphines PMe3, PEt3 and PMe2Ph afforded the new bis(boryl) compounds cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2], [RhCl(PEt3)2-{B(1,2-O2C6H 4)}2] and cis,mer-[RhCl(PMe2Ph)3{B(1,2-O2C 6H4)}2], the PEt3 complex having been characterised by X-ray crystallography and shown to be similar to the PPh3 complex. The iridium analogue [IrCl(PEt3)2-{B(1,2-O2C6H 4)}2] was also prepared from the reaction between [IrCl(PEt3)3] and B2(1,2-O2C6H4)2 and shown by X-ray crystallography to be isomorphous with the rhodium complex. Reactions between [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2] and the phosphines PPri 3, P(C6H11)3, 1,2-bis(diphenylphosphino)ethane (dppe) and 1,2-bis(dicyclohexylphosphino)ethane (dcpe) are also described although these do not result in new rhodium boryl complexes. The reaction between [{RhCl(dppe)}2] and B2(1,2-O2C6H4)2 afforded a compound tentatively assigned as [Rh(dppe)2{B(1,2-O2C6H4)}] with analogous compounds being formed with the diborane(4) compounds B2(1,2-O2-3-MeC6H3)2 and B2(1,2-O2-4-MeC6H3)2. Finally, the reaction between [Rh(PMe3)4]Cl and the diborane(4) compound B2(1,2-O2C6H4)2 is described which affords cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2]. Analogous reactions with B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH-(CO 2MeJ]2 afforded similar products.

AB - The reaction between the diborane(4) compound B2(1,2-O2C6H4)2 and either of the rhodium(I) complexes [RhCl(PPh3)3] or [{Rh(μ-Cl)(PPh3)2}2] afforded the colourless rhodium(III) bis(boryl) species [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2]. Similar reactions have been carried out with the diborane(4) compounds B2(1,2-O2-4-ButC6H3) 2, B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2, B2(1,2-O2-4-MeC6H3)2, B2(1,2-O2-3-MeOC6H3)2, B2(1,2-S2C6H4)2, B2(1,2-S2-4-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH(CO 2Me)]2 affording analogous rhodium complexes all of which have been characterised spectroscopically. The complexes derived from the reactions with B2(1,2-O2C6H4)2 and B2(1,2-O2-3-MeC6H3)2 have also been characterised by X-ray crystallography, the structures comprising a five-co-ordinate rhodium centre with a square-based-pyramidal geometry in which the apical site is occupied by a boryl group and the phosphines are mutually trims in basal positions. Reactivity studies have also been carried out for [RhCl(PPh3)2{B(1,2-O2C6H 4)}2]. Hydrolysis or alcoholysis with catechol afforded [RhH2Cl(PPh3)3] and either B2(1,2-O2C6H4)2(μ-O) or B2(1,2-O2C6H4)3 and addition of the phosphines PMe3, PEt3 and PMe2Ph afforded the new bis(boryl) compounds cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2], [RhCl(PEt3)2-{B(1,2-O2C6H 4)}2] and cis,mer-[RhCl(PMe2Ph)3{B(1,2-O2C 6H4)}2], the PEt3 complex having been characterised by X-ray crystallography and shown to be similar to the PPh3 complex. The iridium analogue [IrCl(PEt3)2-{B(1,2-O2C6H 4)}2] was also prepared from the reaction between [IrCl(PEt3)3] and B2(1,2-O2C6H4)2 and shown by X-ray crystallography to be isomorphous with the rhodium complex. Reactions between [RhCl(PPh3)2-{B(1,2-O2C6H 4)}2] and the phosphines PPri 3, P(C6H11)3, 1,2-bis(diphenylphosphino)ethane (dppe) and 1,2-bis(dicyclohexylphosphino)ethane (dcpe) are also described although these do not result in new rhodium boryl complexes. The reaction between [{RhCl(dppe)}2] and B2(1,2-O2C6H4)2 afforded a compound tentatively assigned as [Rh(dppe)2{B(1,2-O2C6H4)}] with analogous compounds being formed with the diborane(4) compounds B2(1,2-O2-3-MeC6H3)2 and B2(1,2-O2-4-MeC6H3)2. Finally, the reaction between [Rh(PMe3)4]Cl and the diborane(4) compound B2(1,2-O2C6H4)2 is described which affords cis,mer-[RhCl(PMe3)3{B(1,2-O2C 6H4)}2]. Analogous reactions with B2(1,2-O2-3,5-But 2C 6H2)2, B2(1,2-O2-3-MeC6H3)2 and B2[R,R-1,2-O2CH(CO2Me)CH-(CO 2MeJ]2 afforded similar products.

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DO - 10.1039/A705374F

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JO - Journal of the Chemical Society. Dalton Transactions

T2 - Journal of the Chemical Society. Dalton Transactions

JF - Journal of the Chemical Society. Dalton Transactions

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