Synthesis and structures of dinuclear iron, molybdenum and tungsten complexes derived from (PhCHCHPh)-coupled bis(cyclopentadiene)

Li, Bin; Wang, Baiquan; Xu, Shansheng; Zhou, Xiuzhong

doi:10.1016/j.jorganchem.2005.05.004

Cited by 5 publications

(2 citation statements)

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“…Lithiation of ligand CpPhCHCHPhCp and addition of (MeCN)3M(CO)3 (M = Mo, W) followed by oxidation with 2 equiv. of ferrocenium tetrafluoroborate, afford (PhCHCHPh)-coupled bis(cyclopentadienyl) dinuclear molybdenum and tungsten complexes [186].…”

Section: Scheme 45mentioning

confidence: 99%

The chemistry of group-VIb metal carbonyls

Kaushik¹,

Singh²,

Kumar³

2012

Eur. J. Chem.

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KEYWORDSThe special interest attached to the chemistry of metal carbonyls arises from several causes. While quite distinct from the metal carbonyls in the organometallic compounds, they differ in physical properties (e.g., their volatility) from all other compounds of the transition metals. Chemically, they constitute a group of compounds in which the formal valency of the metal atoms is zero, and in this respect (apart, perhaps, from the ammoniates of the alkali metals) they are comparable only with the recently discovered compounds. As a class, the carbonyls are reactive compounds, and a number of new types of inorganic compounds have been discovered. In the concepts for new products, performance, product safety, and product economy criteria are equally important. They are taken into account already when the raw material base for a new industrial product development is defined. Since the discovery of nickel carbonyl by Mond and Langer in 1888, the carbonyls of the iron group and of chromium, molybdenum and tungsten have found important technical applications, e.g., in the Mond nickel process, and for the preparation of the metals in a state of subdivision and of purity suitable for powder metallurgy, for catalysts, etc. The reaction mechanism of the processes developed for producing the carbonyls technically has only recently received its interpretations. Within the space of review it is necessary to limit discussion to a few topics. Particular stress has accordingly laid upon (a) the chemical bonding in metal carbonyls, (b) importance of IR and NMR spectroscopy in characterization of metal carbonyls, (c) substitution reactions of G-VIb metal carbonyls, (d) kinetics and mechanism of substitution reactions in metal carbonyls, (e) substituted complexes of G-VIb metal carbonyl, (f) chelate complexes of G-VIb metal carbonyls, (g) uses of G-VIb metal carbonyl complexes and (h) studies done on G-VIb metal carbonyls.

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Section: Scheme 45mentioning

confidence: 99%

The chemistry of group-VIb metal carbonyls

Kaushik¹,

Singh²,

Kumar³

2012

Eur. J. Chem.

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“…For the structural parameters of mono-alkyl substituted cyclopentadienes (organic structures only), see: Tacke et al (2001); Liebling & Marsh (1965); Haumann et al(1996); Deck et al (2004); Malpass et al (2004); Cheung et al (2005); Bauer et al (2001); Huerlander et al (2002); Millelr & Bercaw (2004); Li et al (2005); Brunner et al (2004); Otero et al (2007); Hutton et al (2008). For the structural parameters of 1,2dialkyl-1H-imidazoles (organic structures only, not bi-or oligocyclic, non-ionic), see: Bruijnincx et al (2005); Aakeroy et al (2006); Zhang et al (2007); Upadhyaya et al (1997); Braussaud et al (2001); Peters et al (2005); Laus et al (2008).…”

Section: Related Literaturementioning

confidence: 99%

2-[(Cyclopenta-1,3-dien-2-yl)diphenylmethyl]-1-methyl-1H-imidazole

2010

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The title compound, C22H20N2, (Ib), forms along with 2-[(cyclopenta-1,3-dien-1-yl)diphenylmethyl]-1-methyl-1H-imidazole, (Ia), which differs with respect to the position of the double-bonds in the C5H5 ring, in an approximately 3:7 ratio (Ia:Ib; NMR spectroscopy data). However, in a single crystal, only compound (Ib) is present. H atoms of the CH2 group (C5H5 ring) were found from the difference Fourier synthesis and refined isotropically using the riding model. Hypothesis on possible presence of the (Ia) isomer in crystal lattice (model with a C5H5 ring disordered between two positions) was especially checked and rejected due to its inconsistency. In the crystal structure, no significant hydrogen-bonding interactions between the CH2 groups of the C5H5 rings and nonsubstituted N-atoms of the imidazole rings were observed. Despite the fact that the chemically achiral compound (I) crystallizes in a chiral space group P212121, neither the absolute structure determination nor assignment of the inversion twinning was possible in the absence of a heavy atom.

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