Syntheses and Reactions with Lewis Bases of Ru4(CO)8(μ3-O2C6H2R2)2 (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru4(CO)8(O2C6H4)2•CH2Cl2, Ru4(CO)8(O2C6h2(t-bu)2)2. 2Ch2Cl2, Ru4(CO)8(O2C6H2(t-Bu)2)2(py)2, and Ru4(CO)7(O2C6H2(t-Bu)2)2(PhC≡CCO2Et)

Witold Paw; Jerome B. Keister; Charles H. Lake; Melvyn Rowen Churchill

doi:10.1021/om00002a026

Syntheses and Reactions with Lewis Bases of Ru₄(CO)₈(μ₃-O₂C₆H₂R₂)₂ (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru₄(CO)₈(O₂C₆H₄)₂•CH₂Cl₂, Ru₄(CO)₈(O₂C₆h₂(t-bu)₂)₂. 2Ch2Cl2, Ru₄(CO)₈(O₂C₆H₂(t-Bu)₂)₂(py)₂, and Ru₄(CO)₇(O₂C₆H₂(t-Bu)₂)₂(PhC≡CCO₂Et)

Witold Paw
, Jerome B. Keister
, Charles H. Lake
, Melvyn Rowen Churchill

Chemistry

SUNY Buffalo

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

The reactions of Ru₃(CO)₁₂ with catechol and with 3,5-di-tert-butyl-l,2-benzoquinone yield three clusters Ru₄(CO)₈(μ₃-O₂C₆H₂R₂)₂, R = H or t-Bu, which differ in the arrangement of metal atoms but which all contain μ₃-semiquinone ligands coordinated via terminal and bridging O atoms and a π-η⁶-C₆ ring. One isomer, designated 1:3, has a structure containing a linear array of three Ru atoms connected by metal-metal bonds and with each pair of metal atoms bridged by one dioxolene ligand through an oxygen atom and an η⁶-C₆ ring, while the fourth Ru atom is connected via bridging oxygen atoms from the two dioxolene ligands. The other isomer, designated 2:2, contains two diruthenium units, each pair of Ru atoms connected via a metal-metal bond and a dioxolene ligand bridge via an oxygen atom and a η⁶-C₆ ring, and the two Ru₂ units are connected via bridging oxygen atoms from both dioxolene ligands. The 1:3 isomer Ru₄(O₂C₆H₂(t-Bu)₂)₂(CO)₈ does not react directly with Lewis bases but reacts with trimethylamine N-oxide in THF or acetonitrile to form Ru₄(O₂C₆H₂-(t-Bu)₂)₂(CO)₇L, L = THF or NCMe, respectively. The THF complex reacts with L = PPh₃, trans-EtO₂CCH=CHCO₂Et, C₂(CO₂Me)₂, PhCCCO₂Et, or C₂Ph₂ to yield Ru₄(O₂C₆H₂(t-Bu)₂)₂-(CO)₇L. The analogous 2:2 isomer undergoes fragmentation in the presence of most Lewis bases but rapidly and reversibly reacts with pyridine to form Ru₄(O₂C₆H₂(t-Bu)₂)₂(CO)₈(py)₂. Four X-ray diffraction studies are reported. Ru₄(CO)₈(O₂C₆H₄)₂•CH₂Cl₂ crystallizes in the noncentrosymmetric orthorhombic space group Pnn2 with a = 13.9003(20)Å, b = 8.6481(21) Å, c = 10.6075(16) Å, V = 1275.1(4) Å³, and Z = 2. The structure was refined to R = 1.92% for 1572 reflections above 6σ. The molecule has C₂ symmetry with a close-to-linear array of three Ru atoms, the two terminal metal atoms being linked to η⁶-O₂C₆H₄ ligands and two CO ligands; the central Ru and the “lone” Ru atom are each bonded to two CO ligands and are bridged by the oxygen atoms of the O₂C₆H₄ ligands. Ru₄(CO)₈(O₂C₆H₂-(t-Bu)₂)₂•2CH₂Cl₂ crystallizes in space group P1 with a = 11.3503(13) Å, b = 11.4188(11) Å, c = 19.4541(19) Å, α = 93.680(8)°, β = 102.682(8)°, γ = 107.260(8)°, V = 2326.3(4) Å³, and Z = 2. The structure was refined to R = 4.34% for 3540 reflections above 6σ. The ruthenium-containing molecules have C_i symmetry. The molecule is composed of two [η⁶-O₂C₆H_2-(t-Bu)₂]Ru(CO)₂-Ru(CO)₂ units which are held together by additional Ru-O linkages. Ru₄-(CO)₈(O₂C₆H₂(t-Bu)₂)₂(py)₂ crystallizes in space group P2_1/n with a = 12.5406(16) Å, b = 23.9907(34) Å, c = 16.5219(19) Å, β= 91.989(10)°, V = 4967.8(11) Å³, and Z = 4. The structure was refined to R = 2.85% for 2833 reflections above 6a. The molecule is not symmetrical, but consists of [η⁶-O₂C₆H₂(t-Bu)₂](OC)₂Ru-Ru(CO)₂(py) and [η⁶-O₂C₆H₂-(t-Bu₂)](OC)Ru(μ-CO)₂Ru(CO)(py) units held together by Ru-I linkages. The ¹³C NMR spectrum indicates that the same structure is adopted in solution; surprisingly, even though pairwise bridge-terminal carbonyl exchange would interconvert the two Ru₂ subunits, the molecule is rigid on the NMR time scale at room temperature. Ru₄(CO)₇(O₂C₆H₂-(t-Bu)₂)₂(PhC≡CCO₂Et) crystallizes in the noncentrosymmetric orthorhombic space group P2₁2₁2₁ with a = 12.4149(19) Å, b = 16.0888(27) Å, c = 23.9674(31) Å, V = 4787.3(13) Å³, and Z = 4. The structure was refined to R = 5.01% for 3782 reflections above 6σ. The molecule has a connectivity similar to that of Ru₄(CO)₈(O₂C₆H₄)₂ but with an alkyne ligand substituting for a CO on the “lone” Ru atom.

Original language	English
Pages (from-to)	767-779
Number of pages	13
Journal	Organometallics
Volume	14
Issue number	2
DOIs	https://doi.org/10.1021/om00002a026
State	Published - Feb 1995

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Paw, W., Keister, J. B., Lake, C. H., & Churchill, M. R. (1995). Syntheses and Reactions with Lewis Bases of Ru₄(CO)₈(μ₃-O₂C₆H₂R₂)₂ (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru₄(CO)₈(O₂C₆H₄)₂•CH₂Cl₂, Ru₄(CO)₈(O₂C₆h₂(t-bu)₂)₂. 2Ch2Cl2, Ru₄(CO)₈(O₂C₆H₂(t-Bu)₂)₂(py)₂, and Ru₄(CO)₇(O₂C₆H₂(t-Bu)₂)₂(PhC≡CCO₂Et). Organometallics, 14(2), 767-779. https://doi.org/10.1021/om00002a026

Paw, Witold ; Keister, Jerome B. ; Lake, Charles H. et al. / Syntheses and Reactions with Lewis Bases of Ru₄(CO)₈(μ₃-O₂C₆H₂R₂)₂ (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru₄(CO)₈(O₂C₆H₄)₂•CH₂Cl₂, Ru₄(CO)₈(O₂C₆h₂(t-bu)₂)₂. 2Ch2Cl2, Ru₄(CO)₈(O₂C₆H₂(t-Bu)₂)₂(py)₂, and Ru₄(CO)₇(O₂C₆H₂(t-Bu)₂)₂(PhC≡CCO₂Et). In: Organometallics. 1995 ; Vol. 14, No. 2. pp. 767-779.

@article{5bfaca4f5b9c4a5da4ddcbab0a37404d,

title = "Syntheses and Reactions with Lewis Bases of Ru4(CO)8(μ3-O2C6H2R2)2 (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru4(CO)8(O2C6H4)2•CH2Cl2, Ru4(CO)8(O2C6h2(t-bu)2)2. 2Ch2Cl2, Ru4(CO)8(O2C6H2(t-Bu)2)2(py)2, and Ru4(CO)7(O2C6H2(t-Bu)2)2(PhC≡CCO2Et)",

abstract = "The reactions of Ru3(CO)12 with catechol and with 3,5-di-tert-butyl-l,2-benzoquinone yield three clusters Ru4(CO)8(μ3-O2C6H2R2)2, R = H or t-Bu, which differ in the arrangement of metal atoms but which all contain μ3-semiquinone ligands coordinated via terminal and bridging O atoms and a π-η6-C6 ring. One isomer, designated 1:3, has a structure containing a linear array of three Ru atoms connected by metal-metal bonds and with each pair of metal atoms bridged by one dioxolene ligand through an oxygen atom and an η6-C6 ring, while the fourth Ru atom is connected via bridging oxygen atoms from the two dioxolene ligands. The other isomer, designated 2:2, contains two diruthenium units, each pair of Ru atoms connected via a metal-metal bond and a dioxolene ligand bridge via an oxygen atom and a η6-C6 ring, and the two Ru2 units are connected via bridging oxygen atoms from both dioxolene ligands. The 1:3 isomer Ru4(O2C6H2(t-Bu)2)2(CO)8 does not react directly with Lewis bases but reacts with trimethylamine N-oxide in THF or acetonitrile to form Ru4(O2C6H2-(t-Bu)2)2(CO)7L, L = THF or NCMe, respectively. The THF complex reacts with L = PPh3, trans-EtO2CCH=CHCO2Et, C2(CO2Me)2, PhCCCO2Et, or C2Ph2 to yield Ru4(O2C6H2(t-Bu)2)2-(CO)7L. The analogous 2:2 isomer undergoes fragmentation in the presence of most Lewis bases but rapidly and reversibly reacts with pyridine to form Ru4(O2C6H2(t-Bu)2)2(CO)8(py)2. Four X-ray diffraction studies are reported. Ru4(CO)8(O2C6H4)2•CH2Cl2 crystallizes in the noncentrosymmetric orthorhombic space group Pnn2 with a = 13.9003(20){\AA}, b = 8.6481(21) {\AA}, c = 10.6075(16) {\AA}, V = 1275.1(4) {\AA}3, and Z = 2. The structure was refined to R = 1.92\% for 1572 reflections above 6σ. The molecule has C2 symmetry with a close-to-linear array of three Ru atoms, the two terminal metal atoms being linked to η6-O2C6H4 ligands and two CO ligands; the central Ru and the “lone” Ru atom are each bonded to two CO ligands and are bridged by the oxygen atoms of the O2C6H4 ligands. Ru4(CO)8(O2C6H2-(t-Bu)2)2•2CH2Cl2 crystallizes in space group P1 with a = 11.3503(13) {\AA}, b = 11.4188(11) {\AA}, c = 19.4541(19) {\AA}, α = 93.680(8)°, β = 102.682(8)°, γ = 107.260(8)°, V = 2326.3(4) {\AA}3, and Z = 2. The structure was refined to R = 4.34\% for 3540 reflections above 6σ. The ruthenium-containing molecules have Ci symmetry. The molecule is composed of two [η6-O2C6H2-(t-Bu)2]Ru(CO)2-Ru(CO)2 units which are held together by additional Ru-O linkages. Ru4-(CO)8(O2C6H2(t-Bu)2)2(py)2 crystallizes in space group P21/n with a = 12.5406(16) {\AA}, b = 23.9907(34) {\AA}, c = 16.5219(19) {\AA}, β= 91.989(10)°, V = 4967.8(11) {\AA}3, and Z = 4. The structure was refined to R = 2.85\% for 2833 reflections above 6a. The molecule is not symmetrical, but consists of [η6-O2C6H2(t-Bu)2](OC)2Ru-Ru(CO)2(py) and [η6-O2C6H2-(t-Bu2)](OC)Ru(μ-CO)2Ru(CO)(py) units held together by Ru-I linkages. The 13C NMR spectrum indicates that the same structure is adopted in solution; surprisingly, even though pairwise bridge-terminal carbonyl exchange would interconvert the two Ru2 subunits, the molecule is rigid on the NMR time scale at room temperature. Ru4(CO)7(O2C6H2-(t-Bu)2)2(PhC≡CCO2Et) crystallizes in the noncentrosymmetric orthorhombic space group P212121 with a = 12.4149(19) {\AA}, b = 16.0888(27) {\AA}, c = 23.9674(31) {\AA}, V = 4787.3(13) {\AA}3, and Z = 4. The structure was refined to R = 5.01\% for 3782 reflections above 6σ. The molecule has a connectivity similar to that of Ru4(CO)8(O2C6H4)2 but with an alkyne ligand substituting for a CO on the “lone” Ru atom.",

author = "Witold Paw and Keister, \{Jerome B.\} and Lake, \{Charles H.\} and Churchill, \{Melvyn Rowen\}",

year = "1995",

month = feb,

doi = "10.1021/om00002a026",

language = "English",

volume = "14",

pages = "767--779",

journal = "Organometallics",

issn = "0276-7333",

publisher = "American Chemical Society",

number = "2",

}

Paw, W, Keister, JB, Lake, CH & Churchill, MR 1995, 'Syntheses and Reactions with Lewis Bases of Ru₄(CO)₈(μ₃-O₂C₆H₂R₂)₂ (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru₄(CO)₈(O₂C₆H₄)₂•CH₂Cl₂, Ru₄(CO)₈(O₂C₆h₂(t-bu)₂)₂. 2Ch2Cl2, Ru₄(CO)₈(O₂C₆H₂(t-Bu)₂)₂(py)₂, and Ru₄(CO)₇(O₂C₆H₂(t-Bu)₂)₂(PhC≡CCO₂Et)', Organometallics, vol. 14, no. 2, pp. 767-779. https://doi.org/10.1021/om00002a026

Syntheses and Reactions with Lewis Bases of Ru₄(CO)₈(μ₃-O₂C₆H₂R₂)₂ (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru₄(CO)₈(O₂C₆H₄)₂•CH₂Cl₂, Ru₄(CO)₈(O₂C₆h₂(t-bu)₂)₂. 2Ch2Cl2, Ru₄(CO)₈(O₂C₆H₂(t-Bu)₂)₂(py)₂, and Ru₄(CO)₇(O₂C₆H₂(t-Bu)₂)₂(PhC≡CCO₂Et). / Paw, Witold; Keister, Jerome B.; Lake, Charles H. et al.
In: Organometallics, Vol. 14, No. 2, 02.1995, p. 767-779.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Syntheses and Reactions with Lewis Bases of Ru4(CO)8(μ3-O2C6H2R2)2 (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru4(CO)8(O2C6H4)2•CH2Cl2, Ru4(CO)8(O2C6h2(t-bu)2)2. 2Ch2Cl2, Ru4(CO)8(O2C6H2(t-Bu)2)2(py)2, and Ru4(CO)7(O2C6H2(t-Bu)2)2(PhC≡CCO2Et)

AU - Paw, Witold

AU - Keister, Jerome B.

AU - Lake, Charles H.

AU - Churchill, Melvyn Rowen

PY - 1995/2

Y1 - 1995/2

N2 - The reactions of Ru3(CO)12 with catechol and with 3,5-di-tert-butyl-l,2-benzoquinone yield three clusters Ru4(CO)8(μ3-O2C6H2R2)2, R = H or t-Bu, which differ in the arrangement of metal atoms but which all contain μ3-semiquinone ligands coordinated via terminal and bridging O atoms and a π-η6-C6 ring. One isomer, designated 1:3, has a structure containing a linear array of three Ru atoms connected by metal-metal bonds and with each pair of metal atoms bridged by one dioxolene ligand through an oxygen atom and an η6-C6 ring, while the fourth Ru atom is connected via bridging oxygen atoms from the two dioxolene ligands. The other isomer, designated 2:2, contains two diruthenium units, each pair of Ru atoms connected via a metal-metal bond and a dioxolene ligand bridge via an oxygen atom and a η6-C6 ring, and the two Ru2 units are connected via bridging oxygen atoms from both dioxolene ligands. The 1:3 isomer Ru4(O2C6H2(t-Bu)2)2(CO)8 does not react directly with Lewis bases but reacts with trimethylamine N-oxide in THF or acetonitrile to form Ru4(O2C6H2-(t-Bu)2)2(CO)7L, L = THF or NCMe, respectively. The THF complex reacts with L = PPh3, trans-EtO2CCH=CHCO2Et, C2(CO2Me)2, PhCCCO2Et, or C2Ph2 to yield Ru4(O2C6H2(t-Bu)2)2-(CO)7L. The analogous 2:2 isomer undergoes fragmentation in the presence of most Lewis bases but rapidly and reversibly reacts with pyridine to form Ru4(O2C6H2(t-Bu)2)2(CO)8(py)2. Four X-ray diffraction studies are reported. Ru4(CO)8(O2C6H4)2•CH2Cl2 crystallizes in the noncentrosymmetric orthorhombic space group Pnn2 with a = 13.9003(20)Å, b = 8.6481(21) Å, c = 10.6075(16) Å, V = 1275.1(4) Å3, and Z = 2. The structure was refined to R = 1.92% for 1572 reflections above 6σ. The molecule has C2 symmetry with a close-to-linear array of three Ru atoms, the two terminal metal atoms being linked to η6-O2C6H4 ligands and two CO ligands; the central Ru and the “lone” Ru atom are each bonded to two CO ligands and are bridged by the oxygen atoms of the O2C6H4 ligands. Ru4(CO)8(O2C6H2-(t-Bu)2)2•2CH2Cl2 crystallizes in space group P1 with a = 11.3503(13) Å, b = 11.4188(11) Å, c = 19.4541(19) Å, α = 93.680(8)°, β = 102.682(8)°, γ = 107.260(8)°, V = 2326.3(4) Å3, and Z = 2. The structure was refined to R = 4.34% for 3540 reflections above 6σ. The ruthenium-containing molecules have Ci symmetry. The molecule is composed of two [η6-O2C6H2-(t-Bu)2]Ru(CO)2-Ru(CO)2 units which are held together by additional Ru-O linkages. Ru4-(CO)8(O2C6H2(t-Bu)2)2(py)2 crystallizes in space group P21/n with a = 12.5406(16) Å, b = 23.9907(34) Å, c = 16.5219(19) Å, β= 91.989(10)°, V = 4967.8(11) Å3, and Z = 4. The structure was refined to R = 2.85% for 2833 reflections above 6a. The molecule is not symmetrical, but consists of [η6-O2C6H2(t-Bu)2](OC)2Ru-Ru(CO)2(py) and [η6-O2C6H2-(t-Bu2)](OC)Ru(μ-CO)2Ru(CO)(py) units held together by Ru-I linkages. The 13C NMR spectrum indicates that the same structure is adopted in solution; surprisingly, even though pairwise bridge-terminal carbonyl exchange would interconvert the two Ru2 subunits, the molecule is rigid on the NMR time scale at room temperature. Ru4(CO)7(O2C6H2-(t-Bu)2)2(PhC≡CCO2Et) crystallizes in the noncentrosymmetric orthorhombic space group P212121 with a = 12.4149(19) Å, b = 16.0888(27) Å, c = 23.9674(31) Å, V = 4787.3(13) Å3, and Z = 4. The structure was refined to R = 5.01% for 3782 reflections above 6σ. The molecule has a connectivity similar to that of Ru4(CO)8(O2C6H4)2 but with an alkyne ligand substituting for a CO on the “lone” Ru atom.

AB - The reactions of Ru3(CO)12 with catechol and with 3,5-di-tert-butyl-l,2-benzoquinone yield three clusters Ru4(CO)8(μ3-O2C6H2R2)2, R = H or t-Bu, which differ in the arrangement of metal atoms but which all contain μ3-semiquinone ligands coordinated via terminal and bridging O atoms and a π-η6-C6 ring. One isomer, designated 1:3, has a structure containing a linear array of three Ru atoms connected by metal-metal bonds and with each pair of metal atoms bridged by one dioxolene ligand through an oxygen atom and an η6-C6 ring, while the fourth Ru atom is connected via bridging oxygen atoms from the two dioxolene ligands. The other isomer, designated 2:2, contains two diruthenium units, each pair of Ru atoms connected via a metal-metal bond and a dioxolene ligand bridge via an oxygen atom and a η6-C6 ring, and the two Ru2 units are connected via bridging oxygen atoms from both dioxolene ligands. The 1:3 isomer Ru4(O2C6H2(t-Bu)2)2(CO)8 does not react directly with Lewis bases but reacts with trimethylamine N-oxide in THF or acetonitrile to form Ru4(O2C6H2-(t-Bu)2)2(CO)7L, L = THF or NCMe, respectively. The THF complex reacts with L = PPh3, trans-EtO2CCH=CHCO2Et, C2(CO2Me)2, PhCCCO2Et, or C2Ph2 to yield Ru4(O2C6H2(t-Bu)2)2-(CO)7L. The analogous 2:2 isomer undergoes fragmentation in the presence of most Lewis bases but rapidly and reversibly reacts with pyridine to form Ru4(O2C6H2(t-Bu)2)2(CO)8(py)2. Four X-ray diffraction studies are reported. Ru4(CO)8(O2C6H4)2•CH2Cl2 crystallizes in the noncentrosymmetric orthorhombic space group Pnn2 with a = 13.9003(20)Å, b = 8.6481(21) Å, c = 10.6075(16) Å, V = 1275.1(4) Å3, and Z = 2. The structure was refined to R = 1.92% for 1572 reflections above 6σ. The molecule has C2 symmetry with a close-to-linear array of three Ru atoms, the two terminal metal atoms being linked to η6-O2C6H4 ligands and two CO ligands; the central Ru and the “lone” Ru atom are each bonded to two CO ligands and are bridged by the oxygen atoms of the O2C6H4 ligands. Ru4(CO)8(O2C6H2-(t-Bu)2)2•2CH2Cl2 crystallizes in space group P1 with a = 11.3503(13) Å, b = 11.4188(11) Å, c = 19.4541(19) Å, α = 93.680(8)°, β = 102.682(8)°, γ = 107.260(8)°, V = 2326.3(4) Å3, and Z = 2. The structure was refined to R = 4.34% for 3540 reflections above 6σ. The ruthenium-containing molecules have Ci symmetry. The molecule is composed of two [η6-O2C6H2-(t-Bu)2]Ru(CO)2-Ru(CO)2 units which are held together by additional Ru-O linkages. Ru4-(CO)8(O2C6H2(t-Bu)2)2(py)2 crystallizes in space group P21/n with a = 12.5406(16) Å, b = 23.9907(34) Å, c = 16.5219(19) Å, β= 91.989(10)°, V = 4967.8(11) Å3, and Z = 4. The structure was refined to R = 2.85% for 2833 reflections above 6a. The molecule is not symmetrical, but consists of [η6-O2C6H2(t-Bu)2](OC)2Ru-Ru(CO)2(py) and [η6-O2C6H2-(t-Bu2)](OC)Ru(μ-CO)2Ru(CO)(py) units held together by Ru-I linkages. The 13C NMR spectrum indicates that the same structure is adopted in solution; surprisingly, even though pairwise bridge-terminal carbonyl exchange would interconvert the two Ru2 subunits, the molecule is rigid on the NMR time scale at room temperature. Ru4(CO)7(O2C6H2-(t-Bu)2)2(PhC≡CCO2Et) crystallizes in the noncentrosymmetric orthorhombic space group P212121 with a = 12.4149(19) Å, b = 16.0888(27) Å, c = 23.9674(31) Å, V = 4787.3(13) Å3, and Z = 4. The structure was refined to R = 5.01% for 3782 reflections above 6σ. The molecule has a connectivity similar to that of Ru4(CO)8(O2C6H4)2 but with an alkyne ligand substituting for a CO on the “lone” Ru atom.

UR - https://www.scopus.com/pages/publications/0000119065

U2 - 10.1021/om00002a026

DO - 10.1021/om00002a026

M3 - Article

AN - SCOPUS:0000119065

SN - 0276-7333

VL - 14

SP - 767

EP - 779

JO - Organometallics

JF - Organometallics

IS - 2

ER -

Paw W, Keister JB, Lake CH, Churchill MR. Syntheses and Reactions with Lewis Bases of Ru₄(CO)₈(μ₃-O₂C₆H₂R₂)₂ (R = H, t-Bu), Complexes Containing 1,2-Semiquinone Ligands Which Bridge through Oxygen and η6-c6 Rings. Crystal Structures of Ru₄(CO)₈(O₂C₆H₄)₂•CH₂Cl₂, Ru₄(CO)₈(O₂C₆h₂(t-bu)₂)₂. 2Ch2Cl2, Ru₄(CO)₈(O₂C₆H₂(t-Bu)₂)₂(py)₂, and Ru₄(CO)₇(O₂C₆H₂(t-Bu)₂)₂(PhC≡CCO₂Et). Organometallics. 1995 Feb;14(2):767-779. doi: 10.1021/om00002a026

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