New cyclobutadiene complexes of cobalt

Helling, John F.; Rennison, S. C.; Merijan, Ashot

doi:10.1021/ja01002a069

Cited by 37 publications

(5 citation statements)

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“…It is difficult to differentiate between 1,2- and 1,3-diphenylcyclobutadiene ligands by NMR spectroscopy, so 5 was identified as the 1,2-isomer by a single-crystal X-ray diffraction study (Figure ). The β carbons of the phospholyl ligand are not perfectly resolved, but the 3.2° dihedral angle between the best planes of the phospholyl and cyclobutadiene rings is sufficiently small to imply little strain in the molecule, presumably because the two phenyl substituents are oriented well away from the tert- butyl groups of the phospholyl ring.…”

Section: Resultsmentioning

confidence: 99%

Reactivity of a (η⁵-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co₂(η⁵-PC₄H₂^tBu₂)₂(CO)₂] and [Co₂(η⁵-PC₄H₂^tBu₂)₂(μ-CHCO₂Et)(CO)₂]

et al. 1997

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Thermolysis of 2,2‘,5,5‘-tetra-tert-butyl-1,1‘-biphosphole with Co2(CO)8 gives good yields of (2,5-di-tert-butylphospholyl)dicarbonylcobalt (1), a compound which provided access to a range of cobalt phospholyl complexes. Thermolysis with trimethyl phosphite produced C12H20PCo(CO)P(OMe)3 (2), while photolysis with 1,3-cyclohexadiene and 1,5-cyclooctadiene gave the corresponding complexes C12H20PCo(diene) (3, 4). In the absence of a donor ligand, a metal−metal doubly bridged dimer 6 was obtained; this reacted classically with ethyl diazoacetate to give the bridging complex {C12H20PCo(CO)}2(μ-CHCO2Et) (7). Prolonged heating of 1 with 3-hexyne in xylene gave the cyclotrimerization product C6Et6; an initial attempt to prepare pyridines by cocyclization of PrCN with PhC⋮CΗ gave the cyclobutadiene complex C12H20PCo(1,2-C4H2Ph2) (5).

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Section: Resultsmentioning

confidence: 99%

Reactivity of a (η⁵-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co₂(η⁵-PC₄H₂^tBu₂)₂(CO)₂] and [Co₂(η⁵-PC₄H₂^tBu₂)₂(μ-CHCO₂Et)(CO)₂]

et al. 1997

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“…These dianions were also useful for the synthesis of corresponding cyclobutadiene derivatives (D and E) on reaction with 1, 2-dibromoethane in THF at room temperature [142]. compounds [144,145] …”

Section: Cobalt Sandwich Compounds Of the Type (η 5 -Cp)co(η 4 -C 4 Rmentioning

confidence: 99%

“…Synthesis of cyclobutadiene dianions from tetrasilyl derivatives of )triphenyltin with CpCo(COD) in 53% yield[144]. Compound 353 undergoes stepwise transmetallation reaction on treatment with phenyllithium and provided an organolithium route for the synthesis of substituted η 4 -cyclobutadienecobalt complexes of type 354 and 355 in good yields (Scheme 74)[145].…”

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confidence: 99%

Chemistry of the highly stable hindered cobalt sandwich compound (η5-Cp)Co(η4-C4Ph4) and its derivatives

Kumar

Deb

Singh

et al. 2016

Coordination Chemistry Reviews

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“…(D) CsHsCoChHjo (IV, m = 4, « = 6). CTLCoCiJLcC (100), C5H6CoCnH13+ (21), Ci4H16Co+ (18), C14H13Co+ (18), C14HnCo+ (30), C5H5Co+(24), and Co+ (28).…”

mentioning

confidence: 99%

“…C4R4.22-24 The macrocyclic alkadiynes 1,7-cyclotri-similarly with C5H5C0QH12 to give the corresponding tricyclic cyclobutadiene derivatives IV.…”

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confidence: 99%

Reactions of transition metal compounds with macrocyclic alkadiynes. I. Intramolecular transannular cyclizations with cyclopentadienyldicarbonylcobalt

King¹,

Efraty²

1972

J. Am. Chem. Soc.

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The macrocyclic alkadiynes 1,7-cyclododecadiyne, 1,7-cyclotridecadiyne, 1,7-and 1,8-cyclotetradecadiyne, and 1,8-cyclopentadecadiyne react with C5H5Co(CO)2 or, in some cases, C6H5Co(l ,5-C8Hi2) in boiling octane or cyclooctane to give yellow to orange volatile compounds of the composition C5H5Co(alkadiyne) in which the macrocyclic alkadiyne has undergone an intramolecular transannular cyclization to form a tricyclic cyclobutadiene derivative. The reaction of 1,8-cyclotetradecadiyne with C5H5Co(CO)2 also gives the black trimetallic derivative (C6H5)aCo3(CO)(Ci4H2o). The infrared, proton nmr, and mass spectra of these new cyclopentadienylcobalt derivatives are discussed. Since 1958 extensive studies have been carried out on (5) H.

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New cyclobutadiene complexes of cobalt

Cited by 37 publications

References 1 publication

Reactivity of a (η⁵-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co₂(η⁵-PC₄H₂^tBu₂)₂(CO)₂] and [Co₂(η⁵-PC₄H₂^tBu₂)₂(μ-CHCO₂Et)(CO)₂]

Reactivity of a (η⁵-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co₂(η⁵-PC₄H₂^tBu₂)₂(CO)₂] and [Co₂(η⁵-PC₄H₂^tBu₂)₂(μ-CHCO₂Et)(CO)₂]

Chemistry of the highly stable hindered cobalt sandwich compound (η5-Cp)Co(η4-C4Ph4) and its derivatives

Reactions of transition metal compounds with macrocyclic alkadiynes. I. Intramolecular transannular cyclizations with cyclopentadienyldicarbonylcobalt

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New cyclobutadiene complexes of cobalt

Cited by 37 publications

References 1 publication

Reactivity of a (η5-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co2(η5-PC4H2tBu2)2(CO)2] and [Co2(η5-PC4H2tBu2)2(μ-CHCO2Et)(CO)2]

Reactivity of a (η5-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co2(η5-PC4H2tBu2)2(CO)2] and [Co2(η5-PC4H2tBu2)2(μ-CHCO2Et)(CO)2]

Chemistry of the highly stable hindered cobalt sandwich compound (η5-Cp)Co(η4-C4Ph4) and its derivatives

Reactions of transition metal compounds with macrocyclic alkadiynes. I. Intramolecular transannular cyclizations with cyclopentadienyldicarbonylcobalt

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Reactivity of a (η⁵-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co₂(η⁵-PC₄H₂^tBu₂)₂(CO)₂] and [Co₂(η⁵-PC₄H₂^tBu₂)₂(μ-CHCO₂Et)(CO)₂]

Reactivity of a (η⁵-Phospholyl)cobalt Dicarbonyl Complex. Synthesis of [Co₂(η⁵-PC₄H₂^tBu₂)₂(CO)₂] and [Co₂(η⁵-PC₄H₂^tBu₂)₂(μ-CHCO₂Et)(CO)₂]