Reactions of nickelocene with benzylmagnesium compounds phenyltris(π-cyclopentadienylnickel)methane

New insights into the reaction of nickelocene with methyllithium: the isolation and crystal structure of (NiCp)3(μ3-CH)

“…While the origin of the two-carbon unit in cluster 2 remains to be elucidated, we assume that it does not involve a solvent molecule. 1 H NMR spectrum of (NiCp) 3 (l 3 -CH) (1) features two singlets at 12.85 and 5.17 ppm corresponding to the methylidyne and cyclopentadienyl protons, respectively [15]. The chemical shift of the methylidyne proton is in the same range as reported for [Co(CO) 3 ] 3 (l 3 -CH) [16] and the analogous methylidyne mixed-metal clusters [17].…”

“…1 H NMR (C 6 D 6 , d, ppm): 5.04 (s, Cp, 5H), 3.53 (bs, @CH, 1H), 2.93 (bs, @CH, 1H), 2.78 (bs, @CH, 1H), 1.31 (m, CH 2 , 6H), 0.88 (bs, CH 3 , 3H), À0.71 (s, Ni-CH 3 , 3H).…”

“…The first eluted fraction was identified as (NiCp) 3 (l 3 -CCH 3 ) (2). 1 [5,10,15]. The second fraction consisted of a mixture of (NiCp) 3 (l 3 CCH 3 ) (2) and (NiCp) 3 (l 3 -CH) (1).…”

“…a Estimated standard deviations in parentheses. 1 To the best of our knowledge, only one hexameric cyclopentadienylnickel cluster, i.e. (NiCp) 6 , has been characterised by X-ray diffraction so far [20].…”

Alkyne-substituted homo- and heterometallic carbonyl clusters of the iron, cobalt and nickel triads

“…47,62 Nickel derivatives like those above have also been obtained from (Cp)2Ni and (C6H5CH2)MgCl. 103 Finally the reaction of Fe3(CO)12 with HC2R alkynes affords complexes Fe3(CO)8(HC2R)4 (10), which, upon internal hydrogen shift within the alkyne, are characterized by CR apical ligands.26 Also, the reactions of (Cp)2Ni2(HC2R) with iron carbonyls gave complexes with apical ligands, upon intermolecular hydrogen transfer.62…”