Anionic initiated coupling of tungsten carbene complexes

synthesis of the first (μ-tris(carbene))trimetallic complex

David W Macomber, Mu Huang Hung

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Treatment of (CO)5W[C(OCH3)C(CH3CH2] (1) with C2H5(CH3)2CONa in THF at -78°C followed by HCl produced: (CO)5W[C(OCH3)CH(CH3)CH2OC(CH3)2C2H5] (3) (1%), C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]CH2C(CH3)CH(OCH3) (5) (<1%), C2H5(CH3)2CO (CO)5W[C(OCH3)C(CH3)CH2]2H (6) (<1%), and the (μ-tris(carbene))trimetallic complex C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]3CH2C(CH3)CH(OCH3) (9) (15%) as well as several, as yet, unidentified compounds. Complex 9 was characterized by analytical and spectroscopic methods; moreover, it was converted to the corresponding triester (10) upon PDC/DMSO oxidation. Upon standing at 0°C for long periods complex 1 was converted into a new (μ-bis(carbene))ditungsten complex (CO)5WC(OCH3)[CH(CH3)CH2CH2C(CH2)]C(OCH3)W(CO)5 (11) in low yield.

Original languageEnglish (US)
Pages (from-to)147-154
Number of pages8
JournalJournal of Organometallic Chemistry
Volume366
Issue number1-2
DOIs
StatePublished - Apr 25 1989
Externally publishedYes

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Tungsten
carbenes
tungsten
methylidyne
Oxidation
synthesis
Dimethyl Sulfoxide
carbene

Cite this

Anionic initiated coupling of tungsten carbene complexes : synthesis of the first (μ-tris(carbene))trimetallic complex. / Macomber, David W; Hung, Mu Huang.

In: Journal of Organometallic Chemistry, Vol. 366, No. 1-2, 25.04.1989, p. 147-154.

Research output: Contribution to journalArticle

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title = "Anionic initiated coupling of tungsten carbene complexes: synthesis of the first (μ-tris(carbene))trimetallic complex",
abstract = "Treatment of (CO)5W[C(OCH3)C(CH3CH2] (1) with C2H5(CH3)2CONa in THF at -78°C followed by HCl produced: (CO)5W[C(OCH3)CH(CH3)CH2OC(CH3)2C2H5] (3) (1{\%}), C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]CH2C(CH3)CH(OCH3) (5) (<1{\%}), C2H5(CH3)2CO (CO)5W[C(OCH3)C(CH3)CH2]2H (6) (<1{\%}), and the (μ-tris(carbene))trimetallic complex C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]3CH2C(CH3)CH(OCH3) (9) (15{\%}) as well as several, as yet, unidentified compounds. Complex 9 was characterized by analytical and spectroscopic methods; moreover, it was converted to the corresponding triester (10) upon PDC/DMSO oxidation. Upon standing at 0°C for long periods complex 1 was converted into a new (μ-bis(carbene))ditungsten complex (CO)5WC(OCH3)[CH(CH3)CH2CH2C(CH2)]C(OCH3)W(CO)5 (11) in low yield.",
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N2 - Treatment of (CO)5W[C(OCH3)C(CH3CH2] (1) with C2H5(CH3)2CONa in THF at -78°C followed by HCl produced: (CO)5W[C(OCH3)CH(CH3)CH2OC(CH3)2C2H5] (3) (1%), C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]CH2C(CH3)CH(OCH3) (5) (<1%), C2H5(CH3)2CO (CO)5W[C(OCH3)C(CH3)CH2]2H (6) (<1%), and the (μ-tris(carbene))trimetallic complex C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]3CH2C(CH3)CH(OCH3) (9) (15%) as well as several, as yet, unidentified compounds. Complex 9 was characterized by analytical and spectroscopic methods; moreover, it was converted to the corresponding triester (10) upon PDC/DMSO oxidation. Upon standing at 0°C for long periods complex 1 was converted into a new (μ-bis(carbene))ditungsten complex (CO)5WC(OCH3)[CH(CH3)CH2CH2C(CH2)]C(OCH3)W(CO)5 (11) in low yield.

AB - Treatment of (CO)5W[C(OCH3)C(CH3CH2] (1) with C2H5(CH3)2CONa in THF at -78°C followed by HCl produced: (CO)5W[C(OCH3)CH(CH3)CH2OC(CH3)2C2H5] (3) (1%), C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]CH2C(CH3)CH(OCH3) (5) (<1%), C2H5(CH3)2CO (CO)5W[C(OCH3)C(CH3)CH2]2H (6) (<1%), and the (μ-tris(carbene))trimetallic complex C2H5(CH3)2CO(CO)5W[C(OCH3)C(CH3)CH2]3CH2C(CH3)CH(OCH3) (9) (15%) as well as several, as yet, unidentified compounds. Complex 9 was characterized by analytical and spectroscopic methods; moreover, it was converted to the corresponding triester (10) upon PDC/DMSO oxidation. Upon standing at 0°C for long periods complex 1 was converted into a new (μ-bis(carbene))ditungsten complex (CO)5WC(OCH3)[CH(CH3)CH2CH2C(CH2)]C(OCH3)W(CO)5 (11) in low yield.

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