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- W2010051410 abstract "The reaction of the heteroleptic Nd(III) iodide, [Nd(L′)(N″)(μ-I)] with the potassium salts of primary aryl amides [KN(H)Ar′] or [KN(H)Ar∗] affords heteroleptic, structurally characterised, low-coordinate neodymium amides [Nd(L′)(N″)(N(H)Ar′)] and [Nd(L′)(N″)(N(H)Ar∗)] cleanly (L′ = t-BuNCH2CH2[C{NC(SiMe3)CHNt-Bu}], N″ = N(SiMe3)2, Ar′ = 2,6-Dipp2C6H3, Dipp = 2,6-Pri2C6H3, Ar∗ = 2,6-(2,4,6-Pri3C6H2)2C6H3). The potassium terphenyl primary amide [KN(H)Ar∗] is readily prepared and isolated, and structurally characterised. Treatment of these primary amide-containing compounds with alkali metal alkyl salts results in ligand exchange to give alkali metal primary amides and intractable heteroleptic Nd(III) alkyl compounds of the form [Nd(L′)(N″)(R)] (R = CH2SiMe3, Me). Attempted deprotonation of the Nd-bound primary amide in [Nd(L′)(N″)(N(H)Ar∗)] with the less nucleophilic phosphazene superbase ButNP{NP(NMe2)3}3 resulted in indiscriminate deprotonations of peripheral ligand CH groups. La synthèse de complexes hétéroleptiques de néodyme à ligands amido-carbène [Nd(L′)(N″)(N(H)Ar′)] et [Nd(L′)(N″)(N(H)Ar∗)], réalisée par réaction de [KN(H)Ar′] ou de [KN(H)Ar∗] avec les amidures de potassium [KN(H)Ar′] ou [KN(H)Ar∗], est décrite (L′ = t-BuNCH2CH2[C{NC(SiMe3)CHNt-Bu}], N″ = N(SiMe3)2, Ar′ = 2,6-Dipp2C6H3, Dipp = 2,6-Pri2C6H3, Ar∗ = 2,6-(2,4,6-Pri3C6H2)2C6H3). La synthèse et la structure d'un nouvel amidure de potassium [KN(H)Ar∗] sont présentées. Les études structurales ont démontré que les complexes sont hétéroleptiques de coordination quatre. Des études de substitution ou de déprotonation sont présentées. Des expériences ont montré que les complexes hétéroleptiques de néodyme sont détruits lorsqu'ils sont mis en présence d'alkyls lithium ou potassium ; les complexes [Nd(L′)(N″)(R)] (R = CH2SiMe3, Me) sont alors isolés. La déprotonation du complexe d'arylamide avec le « superbase » ButNP{NP(NMe2)3}3 a démontré le caractère non régiospécifique de la déprotonation du ligand." @default.
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- W2010051410 date "2008-06-01" @default.
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- W2010051410 title "Synthesis and reactivity of neodymium(III) amido-tethered N-heterocyclic carbene complexes" @default.
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- W2010051410 doi "https://doi.org/10.1016/j.crci.2008.01.012" @default.
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