Some ruthenium derivatives of penta-1,4-diyn-3-one

M.I. Bruce; A. Burgun; M.A. Fox; M. Jevric; Paul Low; B.K. Nicholson; C.R. Parker; Brian Skelton; Allan White; N.N. Zaitseva

doi:10.1021/om400208q

Some ruthenium derivatives of penta-1,4-diyn-3-one

M.I. Bruce, A. Burgun, M.A. Fox, M. Jevric, Paul Low, B.K. Nicholson, C.R. Parker, Brian Skelton, Allan White, N.N. Zaitseva

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Abstract

The reaction between Ru(C≡CH)(dppe)Cp* (1) and oxalyl chloride affords ({Ru(dppe)Cp*}C≡C)2CO (2) in 72% yield. Methylation (MeOTf) of 2 occurs first on the carbonyl oxygen, affording [({Ru(dppe)Cp*}C≡C)2C(OMe)]OTf ([3]OTf). A second methylation of [3]+ on the alkynyl Cβ proceeds slowly, affording [{Cp*(dppe)Ru}CCMeC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([4][OTf]2), whereas protonation of [3]+ occurs readily to give crystallographically characterized [{Cp*(dppe)Ru}CCHC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([5][OTf]2). The molecular structures of [3]OTf and [5][OTf]2 suggest that polarization by the CO group results in significant contributions from the alkynyl-allenylidene or alkynyl-carbyne mesomers, respectively. Reaction of 2 in refluxing MeOH containing [NH4]PF6 results in partial methanolysis to give Ru{C≡CC(O)CH═CH(OMe)}(dppe)Cp* (6). Knövenagel condensation of 2 with CH2(CN)2 affords {[Ru(dppe)Cp*]C≡C}2C═C(CN)2 (7). The related asymmetric complex {Cp*(dppe)Ru}C≡C[C═C(CN)2]C≡CC≡C{Ru(dppe)Cp*} (8) was obtained from the reaction between Ru{C≡CC(CN)═C(CN)2}(dppe)Cp* and lithiated Ru(C≡CC≡CH)(dppe)Cp*. Single-crystal structural determinations of 2, [3]OTf, [5][OTf]2, 6, 7, and 8 are reported, together with a supporting computational study of relevant electronic structures.

Original language	English
Pages (from-to)	3286-3299
Journal	Organometallics
Volume	32
Issue number	11
Early online date	16 May 2013
DOIs	https://doi.org/10.1021/om400208q
Publication status	Published - 10 Jun 2013

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This document is the Accepted Manuscript version of a Published Work that appeared in final form in Organometallics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see: http://dx.doi.org/10.1021/om400208q
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@article{d8bd83f0473f4f6a900392326ea0d485,

title = "Some ruthenium derivatives of penta-1,4-diyn-3-one",

abstract = "The reaction between Ru(C≡CH)(dppe)Cp* (1) and oxalyl chloride affords ({Ru(dppe)Cp*}C≡C)2CO (2) in 72% yield. Methylation (MeOTf) of 2 occurs first on the carbonyl oxygen, affording [({Ru(dppe)Cp*}C≡C)2C(OMe)]OTf ([3]OTf). A second methylation of [3]+ on the alkynyl Cβ proceeds slowly, affording [{Cp*(dppe)Ru}CCMeC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([4][OTf]2), whereas protonation of [3]+ occurs readily to give crystallographically characterized [{Cp*(dppe)Ru}CCHC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([5][OTf]2). The molecular structures of [3]OTf and [5][OTf]2 suggest that polarization by the CO group results in significant contributions from the alkynyl-allenylidene or alkynyl-carbyne mesomers, respectively. Reaction of 2 in refluxing MeOH containing [NH4]PF6 results in partial methanolysis to give Ru{C≡CC(O)CH═CH(OMe)}(dppe)Cp* (6). Kn{\"o}venagel condensation of 2 with CH2(CN)2 affords {[Ru(dppe)Cp*]C≡C}2C═C(CN)2 (7). The related asymmetric complex {Cp*(dppe)Ru}C≡C[C═C(CN)2]C≡CC≡C{Ru(dppe)Cp*} (8) was obtained from the reaction between Ru{C≡CC(CN)═C(CN)2}(dppe)Cp* and lithiated Ru(C≡CC≡CH)(dppe)Cp*. Single-crystal structural determinations of 2, [3]OTf, [5][OTf]2, 6, 7, and 8 are reported, together with a supporting computational study of relevant electronic structures.",

author = "M.I. Bruce and A. Burgun and M.A. Fox and M. Jevric and Paul Low and B.K. Nicholson and C.R. Parker and Brian Skelton and Allan White and N.N. Zaitseva",

year = "2013",

month = jun,

day = "10",

doi = "10.1021/om400208q",

language = "English",

volume = "32",

pages = "3286--3299",

journal = "Organometallics",

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publisher = "American Chemical Society",

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TY - JOUR

T1 - Some ruthenium derivatives of penta-1,4-diyn-3-one

AU - Bruce, M.I.

AU - Burgun, A.

AU - Fox, M.A.

AU - Jevric, M.

AU - Low, Paul

AU - Nicholson, B.K.

AU - Parker, C.R.

AU - Skelton, Brian

AU - White, Allan

AU - Zaitseva, N.N.

PY - 2013/6/10

Y1 - 2013/6/10

N2 - The reaction between Ru(C≡CH)(dppe)Cp* (1) and oxalyl chloride affords ({Ru(dppe)Cp*}C≡C)2CO (2) in 72% yield. Methylation (MeOTf) of 2 occurs first on the carbonyl oxygen, affording [({Ru(dppe)Cp*}C≡C)2C(OMe)]OTf ([3]OTf). A second methylation of [3]+ on the alkynyl Cβ proceeds slowly, affording [{Cp*(dppe)Ru}CCMeC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([4][OTf]2), whereas protonation of [3]+ occurs readily to give crystallographically characterized [{Cp*(dppe)Ru}CCHC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([5][OTf]2). The molecular structures of [3]OTf and [5][OTf]2 suggest that polarization by the CO group results in significant contributions from the alkynyl-allenylidene or alkynyl-carbyne mesomers, respectively. Reaction of 2 in refluxing MeOH containing [NH4]PF6 results in partial methanolysis to give Ru{C≡CC(O)CH═CH(OMe)}(dppe)Cp* (6). Knövenagel condensation of 2 with CH2(CN)2 affords {[Ru(dppe)Cp*]C≡C}2C═C(CN)2 (7). The related asymmetric complex {Cp*(dppe)Ru}C≡C[C═C(CN)2]C≡CC≡C{Ru(dppe)Cp*} (8) was obtained from the reaction between Ru{C≡CC(CN)═C(CN)2}(dppe)Cp* and lithiated Ru(C≡CC≡CH)(dppe)Cp*. Single-crystal structural determinations of 2, [3]OTf, [5][OTf]2, 6, 7, and 8 are reported, together with a supporting computational study of relevant electronic structures.

AB - The reaction between Ru(C≡CH)(dppe)Cp* (1) and oxalyl chloride affords ({Ru(dppe)Cp*}C≡C)2CO (2) in 72% yield. Methylation (MeOTf) of 2 occurs first on the carbonyl oxygen, affording [({Ru(dppe)Cp*}C≡C)2C(OMe)]OTf ([3]OTf). A second methylation of [3]+ on the alkynyl Cβ proceeds slowly, affording [{Cp*(dppe)Ru}CCMeC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([4][OTf]2), whereas protonation of [3]+ occurs readily to give crystallographically characterized [{Cp*(dppe)Ru}CCHC(OMe)CC{Ru(dppe)Cp*}][OTf]2 ([5][OTf]2). The molecular structures of [3]OTf and [5][OTf]2 suggest that polarization by the CO group results in significant contributions from the alkynyl-allenylidene or alkynyl-carbyne mesomers, respectively. Reaction of 2 in refluxing MeOH containing [NH4]PF6 results in partial methanolysis to give Ru{C≡CC(O)CH═CH(OMe)}(dppe)Cp* (6). Knövenagel condensation of 2 with CH2(CN)2 affords {[Ru(dppe)Cp*]C≡C}2C═C(CN)2 (7). The related asymmetric complex {Cp*(dppe)Ru}C≡C[C═C(CN)2]C≡CC≡C{Ru(dppe)Cp*} (8) was obtained from the reaction between Ru{C≡CC(CN)═C(CN)2}(dppe)Cp* and lithiated Ru(C≡CC≡CH)(dppe)Cp*. Single-crystal structural determinations of 2, [3]OTf, [5][OTf]2, 6, 7, and 8 are reported, together with a supporting computational study of relevant electronic structures.

U2 - 10.1021/om400208q

DO - 10.1021/om400208q

M3 - Article

SN - 0276-7333

VL - 32

SP - 3286

EP - 3299

JO - Organometallics

JF - Organometallics

IS - 11

ER -

Some ruthenium derivatives of penta-1,4-diyn-3-one

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