Group 3 complexes incorporating (furyl)-substituted disilazide ligands |
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Authors: | Lloyd TJ Evans F Geoffrey N Cloke Peter B Hitchcock |
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Institution: | Department of Chemistry, University of Sussex, Falmer, Brighton BN1 9QJ, UK |
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Abstract: | A series of mono- and bis-amide scandium and yttrium compounds incorporating the furyl-substituted disilazide ligand, N{SiMe2R}2]− {i} (where R = 2-methylfuryl) have been synthesized. The compounds Sc{i}Cl2 (1), Sc{i}(CH2SiMe3)2 (2) and Sc{i}(OAr)2 (3) were made from suitable scandium starting materials employing either a salt metathesis protocol with Li{i} or via protonolysis of Sc-C bonds by the neutral amine H{i}. The thermally unstable bis-alkyl yttrium compound, ‘Y{i}(CH2SiMe3)2’ was isolated as the bis-THF adduct (4) and the bis-aryloxide Y{i}(OAr)2 (5) was synthesized by elimination of LiOAr from Y(OAr)3. The bis-amide complex Y{i}2Cl (6) and conversion to a rare example of an yttrium benzyl compound Y{i}2(CH2Ph) (7) are described. The yttrium cation, Y{i}2]+, was synthesized by benzyl abstraction from 7 using B(C6F5)3. Structural characterization of representative examples show variation in the coordination modes for amide ligand {i}, differing primarily in the number of furyl groups that coordinate to the metal, with examples in which zero, one or two M-Ofuryl bonds are present. Preliminary investigation in two areas of catalysis are presented. |
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Keywords: | Amide Scandium Yttrium Aryloxide Organolanthanide |
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