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- W2324100400 abstract "The yttrium carbene complex [Y(BIPM)(I)(THF)2] (1; BIPM = C(PPh2NSiMe3)2) was reacted with a range of unsaturated substrates. The reaction of 1 with the phosphaalkyne PCBut afforded the [2 + 2] cycloaddition product [Y{C(PPh2NSiMe3)2(PCBut)-κ4C,C′,N,N′}(I)] (2). Similarly, the reactions of 1 with the heteroallenes N,N′-dicyclohexylcarbodiimide and tert-butyl isocyanate gave the [2 + 2] cycloaddition products [Y{C(PPh2NSiMe3)2[C(NCy)2]-κ4C,N,N′,N″}(I)(THF)] (3) and [Y{C(PPh2NSiMe3)2[C(O)(NBut)]-κ4C,N,N′,O}(I)(THF)2] (4), respectively. In contrast, the reaction of 1 with tert-butyl isothiocyanate afforded the ketenimine ButN═C═C(PPh2NSiMe3)2 (5), with the concomitant formal elimination of “YSI(THF)n”. The sterically demanding arylamine 2,6-diisopropylphenylamine reacted with 1 via a 1,2-addition across the Y═C bond to yield the anilide–methanide complex [Y(BIPMH)(NHDipp)(I)(THF)] (6; Dipp = C6H3Pri2-2,6). The reaction of 1 with the benzopyrone coumarin affords the ring-opened dinuclear aryloxide–enolate complex [Y2{C(PPh2NSiMe3)2[C(O)(CHCHC6H4O-2)]-κ2-N,O:μ,κ-O′}2(I)(μ-I)(THF)] (7), which is postulated to form by sequential Y–O, C–C, and C═C bond formation and cleavage of the C–O ester linkage and the C═O and Y═C double bonds. Benzoyl fluoride reacts with 1 to afford 1/2 equiv of the bis-enolate complex [Y{C(PPh2NSiMe3)2[C(O)(Ph)]-κ2N,O}2(I)] (8) with formal elimination of “YF2I(THF)n” by ligand scrambling. Complexes 2–8 have been characterized by X-ray crystallography, multielement NMR spectroscopy, FTIR spectroscopy, and CHN microanalyses." @default.
- W2324100400 created "2016-06-24" @default.
- W2324100400 creator A5015509328 @default.
- W2324100400 creator A5039618848 @default.
- W2324100400 creator A5084750854 @default.
- W2324100400 creator A5086963679 @default.
- W2324100400 date "2013-02-12" @default.
- W2324100400 modified "2023-10-10" @default.
- W2324100400 title "Reactivity Studies of a T-Shaped Yttrium Carbene: C–F and C–O Bond Activation and C═C Bond Formation Promoted by [Y(BIPM)(I)(THF)<sub>2</sub>] (BIPM = C(PPh<sub>2</sub>NSiMe<sub>3</sub>)<sub>2</sub>)" @default.
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- W2324100400 doi "https://doi.org/10.1021/om301016j" @default.
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