U-C bond

Finally a carbene compound with a U=C bond is Cp3U=CHPMe3.61 Various alkyl and hydrido Cp species can catalyze oligomerization of terminal acetylenes, activate C-H bonds, hydrogenate alkenes, and so on.62... 

Thorium(III) and uranium(III) indenyl compounds, (C9H7)3An, are also known and the molecular stmcture of U(C9H7)3 has been reported. The uranium coordination geometry is approximately trigonal, with U-C bond distances ranging from ca. 2.75(2) to 2.81(2) A. ... 

The U—C bond length in the metallacyclic unit is unusually long (2.752(11) A), and is susceptible to protonation by alcohols, amines, and terminal alkynes reaction with pyridine leads to the generation of a r/ -pyridyl complex. 

The reactivity of U-H and U-C bonds in electron-poor tris(cyclopentadienyl)uranium complexes has been investigated. The compounds (C5H4PPh2-BH3)3UX (X = C1, Me) have been synthesized.81 The series of new tris(cylopentadienyl)uranium complexes also includes the borohydride derivatives Cp 3U(BH4) (Cp = Gp, C5H4PPh2, C5Me4PPh2-BH3, G5H4PPh2 BH3, C5Me4H, C5Me4PPh2).57 81... 

Analysis of the ELF has also been used to understand the bonding in the uranium methylidyne complexes XjUCH (X=F, Cl, Br) [9]. The ELF of each of these complexes was characterized by a ring-shaped disynaptic basin lying perpendicular to the U-C bond, a defining feature of the ELF in the prototypical C-C triple bond of ethyne, leading the authors to assert the existence of an unprecedented U-C triple bond. 

Transition metal-methyl bonds tend to be stronger than those of higher alkyl ligands. For example, the U-C bond in (Cp"),U-CH, (Cp"=T -Me3SiC5HJ is 49 kcal/mol, but the... 

A logical explanation for the short uranium-carix)n bond and wide U-C-P angle involves multiple U=C bonding. Two limiting resonance forms can be written for the [CHFR3] ligand ... 

The structure of the polynuclear product has been established by X-ray diffraction and is formally derived from Insertion of an iron-bound carbonyl ligand into the "U C bond, followed by CO-CO coupling. 

Isonitrile (RNC) insertion into the U-C bond of UBu Cp3 results in the n -iminoacyl 4 (R o Bu, CgH] 2 , and CgH3Me2-2,6). However only a single insertion proceeds for UMe2Cp2 where the product is 5. The remaining methyl is unreactive towards further Bu -NC but is replaced by Cl upon treatment with CCl. ... 

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