Tris(boratabenzene) Lanthanum Complexes: Synthesis, Structure, and Reactivity

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• 作者：Chunhong Wang ; Xuebing Leng ; Yaofeng Chen
• 刊名：Organometallics
• 出版年：2015
• 出版时间：July 13, 2015
• 年：2015
• 卷：34
• 期：13
• 页码：3216-3221
• 全文大小：360K
• ISSN：1520-6041

文摘

A series of tris(boratabenzene) lanthanum complexes were synthesized and structurally characterized. Salt elimination of anhydrous LaCl₃ with Li[C₅H₅BR] (R = H, NEt₂) provided tris(boratabenzene) lanthanum complexes [C₅H₅BH]₃LaLiCl (1) and [C₅H₅BNEt₂]₃LaLiCl(THF) (2) in high yields. Hydroboration of 1-hexene or 3-hexyne with 1 gave the alkyl- or alkenyl-functionalized boratabenzene lanthanum complexes, [C₅H₅B(CH₂)₅CH₃]₃LaLiCl(THF) (3) and [C₅H₅BC(C₂H₅)鈺怌H(C₂H₅)]₃LaLiCl(THF) (4), in good yields. Hydroboration of N,N鈥?diisopropylcarbodiimide with 1 gave the monohydroboration product [C₅H₅BN(ⁱPr)CHN(ⁱPr)][C₅H₅BH]₂La (5) due to the steric bulk of the [C₅H₅BN(ⁱPr)CHN(ⁱPr)]^{鈭?/sup> ligand. Complex 5 can undergo further hydroboration with 3-hexyne or dehydrogenative coupling with phenyl acetylene to afford [C₅H₅BN(iPr)CHN(iPr)][C₅H₅BC(C₂H₅)鈺怌H(C₂H₅)]₂La (6) or [C₅H₅BN(iPr)CHN(iPr)][C₅H₅BC鈮Ph)]₂La (7).}