1982
DOI: 10.1021/ja00389a040
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Activation of reducing agents. Sodium hydride containing complex reducing agents. 18. Study of the nature of complex reducing agents prepared from nickel and zinc salts

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Cited by 27 publications
(10 citation statements)
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“…2b) surrounded by potassium. Caubère, 37 Fort Q5 38 and Hartwig 30 have previously indicated that base can stabilize nickel nanoparticles and this phenomenon is observed in our system as well. In contrast to KOH, the specimen obtained using K 2 CO 3 showed particles with markedly different morphology, with more agglomeration and poor dispersion (≈2%) of Ni nanoparticles (Fig.…”
Section: Characterization and Nature Of The Catalystsupporting
confidence: 83%
“…2b) surrounded by potassium. Caubère, 37 Fort Q5 38 and Hartwig 30 have previously indicated that base can stabilize nickel nanoparticles and this phenomenon is observed in our system as well. In contrast to KOH, the specimen obtained using K 2 CO 3 showed particles with markedly different morphology, with more agglomeration and poor dispersion (≈2%) of Ni nanoparticles (Fig.…”
Section: Characterization and Nature Of The Catalystsupporting
confidence: 83%
“…This may suggest that the role of NaH is at least in part similar to that of Zn 0 , a reductant, and that they reinforce each other. This is supported by Caubère’s work on NiCRA56-63 (See Section 2.2.1), where NaH mediated hydridic reduction of Ni II species was shown to be a contributing reaction. Regardless of the mechanism of this transformation, a variety of α-iodo-α, β-unsaturated ketones, as well as 2-bromopyridine, α-bromostyrene, and β-bromostyrene were compatible with this catalytic system.…”
Section: Nickel-catalyzed Reactions Of Aryl and Vinyl Sulfonates Amentioning
confidence: 60%
“…The absence of ligand in our hydroarylation reaction makes the formation of nanoparticles likely, and we observe an immediate formation of particles upon the addition of the alkoxide to the reaction mixture. Mixtures of alkoxides and reducing reagents have previously been used to generate highly reactive nickel nanoparticle catalysts, and sodium alkoxide has been proposed to stabilize “ligandless” nickel catalysts 25,26. Furthermore, in the hydroarylation reaction, we observed a burst of initial activity (64% yield after 10 minutes), followed by a very slow reaction over the next 14 h when the maximum yield is achieved.…”
mentioning
confidence: 66%
“…Mixtures of alkoxides and reducing reagents have previously been used to generate highly reactive nickel nanoparticle catalysts, and sodium alkoxide has been proposed to stabilize “ligandless” nickel catalysts. 25 , 26 Furthermore, in the hydroarylation reaction, we observed a burst of initial activity (64% yield after 10 minutes), followed by a very slow reaction over the next 14 h when the maximum yield is achieved. Finally, we found that the addition of mercury significantly lowers the yield of the hydroarylation (56% vs. 89% GC yields) ( Scheme 2e ).…”
mentioning
confidence: 77%