Organometallic chemistry of the transition metals XXI. Some π-pentamethylcyclopentadienyl derivatives of various transition metals

King, R. B.; Bisnette, M. B.

doi:10.1016/s0022-328x(00)91042-8

Cited by 330 publications

(126 citation statements)

References 35 publications

Supporting

Mentioning

118

Contrasting

Unclassified

Order By: Relevance

“…[6,9] Treatment of Li[MoCpBz(CO) 3 3 ], which, upon dimerisation and a thermally induced Mo-CO bond cleavage, [10] finally gives [MoCpBz(CO) 2 )] may, however, be excluded, as it goes against the usual reactivity trend that affords π-allyl coordination by thermal or photochemical activation of σ-allyl precursors. [11,12] [10,13] should reflect extensive Mo-CO backbonding. [14,15] The hydrido resonances in 6 appear at δ = -4.85 ppm and in 7 at δ = -6.31 ppm.…”

Section: Resultsmentioning

confidence: 99%

(Pentabenzylcyclopentadienyl)molybdenum Complexes: Synthesis, Structures and Redox Properties

Namorado¹,

Cui²,

Azevedo³

et al. 2007

Eur J Inorg Chem

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

(Pentabenzylcyclopentadienyl)molybdenum Complexes: Synthesis, Structures and Redox Properties

Namorado¹,

Cui²,

Azevedo³

et al. 2007

Eur J Inorg Chem

View full text Add to dashboard Cite

“…The IR spectra of all the new complexes reported show characteristic absorptions at 1019-1030 cm-I, (Pc-c) [14]; 1249-929 cm -t, (Pc-o) [5,15] and 596-497 cm -I, (vTa_ o) [5,16]. IR absorptions at 329-276 cm -~ for 1-7 can be assigned to VTa_ a stretching vibrations [17], suggesting the presence of only terminal metal-chlorine bonds, consistent with the observed NMR data and leading to the proposed formulation.…”

Section: Introductionmentioning

confidence: 95%

Pentamethylcyclopentadienyl halo- and alkyl-alkoxo tantalum(V) complexes. Crystal structure of

Castro

Galakhov

Gómez

et al. 1996

Journal of Organometallic Chemistry

View full text Add to dashboard Cite

Reaction of TaCp" C! 4 with MOR (M -Li, Na) in different molar ratios gives halo alkoxides TaCp" CI,(OR)4_,, (n -3: R -tBu 1; $iPh 3 2; 2,6-Me2C6H 3 3; n --2: R -~Bu 4; SiPh 3 5; 2,6-Me2C6H3 6; a -!: R -SiMe 3 7) in good yields. The alkylidene complex TaCp'(CH2SiMe,02(CHSiMe ~) is hydrolyzed in the presence of traces of water to give the oxo dialkyl derivative [TaCp'(CH2SiM¢3)~O],, 8, and reacts with I equivalent of 2,6-MezC6H~NC affording a new 'q2-iminoacyi compound TaCp" (CH 2$iMe3XCHSiMe3){~ 2"C(CH 2SiMe3 ) = N(2,6"MeaC6 H 3)} 9. Reactions of TaCp "(CH 2SiMe3)a(CHSiMe3 ) with I equivalent of C6HsOH and 4-MeC6H3(OH) 2 result in the formation of the alkyl phenoxo TaCp'(CH2SiMe3)3(OC6Hs) 10 and 4-methyl pyrocatecholate TaCp'(CH2SiMe~)2(O2C6H3Me) 11, whereas the related re,",,:don with 2,6-Me2C6H 3OH leads to the cyclic alkyi-aikoxo compound TaCp (CH2SiMej)2(~2-O(2-CH2-6-MeC6H3)) 12. All the complexes were characterized by IR and NMR (tH and 13C) spectroscopy. The crystal and molecular structure of 12 has been determine~i. C~ystals of 12 are triclinic, space group P'[ with Z -2 in a unit cell of dimensions a-9.

show abstract

“…The prediction is that sterically more demanding ligands would afford a higher percentage transisomer, for example pentamethylcyclopentadienyliron dicarbonyl dimer, XI, exists predominantly as the transisomer [25]. Unexpectedly, the percentage of trans-isomer for complexes VIa-VIc with the more bulky cyclopentadienyl ligands is decreased relative to VII.…”

Section: Substituted Cyclopentadienyliron Dicarbonyl Dimersmentioning

confidence: 99%

Synthesis and properties of sterically congested cyclopentadienes and their transition metal complexes

Clark

Killian

Luthra

et al. 1993

Journal of Organometallic Chemistry

View full text Add to dashboard Cite

Abstract:The synthesis of 1,3-dialkyl substituted cyclopentadienes, C 5 H 4 RR', Cp'H (Va-g) (where R and R' are tert-butyl, isopropyl, neo-pentyl, cyclohexyl, or 1-methylcyclohexyl) is reported. These are synthesized by the nucleophilic addition of methyl or hydride anions to the corresponding 2-alkyl-6,6-dialkylfulvenes (IIIa-f) followed by hydrolysis. These substituted 1,3-cyclopentadienes have been converted to organometallic derivatives such as [Cp'Fe(CO) 2 ] 2 , [Cp'M(CO) 3 Me] (M = Mo or W) and Cp' 2 Fe. The spectroscopic and electrochemical properties of selected complexes have been investigated to probe the steric and electronic properties of the substituted cyclopentadienyl ligands.Article:

show abstract

Organometallic chemistry of the transition metals XXI. Some π-pentamethylcyclopentadienyl derivatives of various transition metals

Cited by 330 publications

References 35 publications

(Pentabenzylcyclopentadienyl)molybdenum Complexes: Synthesis, Structures and Redox Properties

(Pentabenzylcyclopentadienyl)molybdenum Complexes: Synthesis, Structures and Redox Properties

Pentamethylcyclopentadienyl halo- and alkyl-alkoxo tantalum(V) complexes. Crystal structure of

Synthesis and properties of sterically congested cyclopentadienes and their transition metal complexes

Contact Info

Product

Resources

About