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Start Over Author "Nishiura, Masayoshi" Journal organometallics
14 results on '"Nishiura, Masayoshi"'

4. Aluminum Effects in the Syndiospecific Copolymerization of Styrene with Ethylene by Cationic Fluorenyl Scandium Alkyl Catalysts

Author

Li, Xiaofang, primary, Wang, Xiaoying, additional, Tong, Xin, additional, Zhang, Hongxia, additional, Chen, Yuanyuan, additional, Liu, Ying, additional, Liu, Hui, additional, Wang, Xiaojie, additional, Nishiura, Masayoshi, additional, He, Huan, additional, Lin, Zhenguo, additional, Zhang, Shaowen, additional, and Hou, Zhaomin, additional

Published
2013
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13. Hydrogenolysis and Protonation of Polymetallic LutetiumMethylidene and Methyl Complexes.

Author

Li, Tingting, Nishiura, Masayoshi, Cheng, Jianhua, Zhang, Wenxiong, Li, Yang, and Hou, Zhaomin

Subjects
*HYDROGENOLYSIS, *PROTON transfer reactions, *LUTETIUM compounds, *METHYL groups, *METAL complexes, *AMMONIUM compounds, *X-ray diffraction
Abstract

We report the hydrogenolysis andprotonation reactions of a tetrametalliclutetium tetramethylidene complex [Cp′Lu(μ3-CH2)]4(Cp′ = C5Me4SiMe3) (1) and a trimetallic lutetium hexamethylcomplex [Cp′Lu(μ2-CH3)2]3(2) with H2and ammonium boratecompounds. The hydrogenolysis of 1with H2afforded the corresponding tetrahydride tetramethyl complex [Cp′4Lu4(μ4-H)(μ3-H)(μ2-H)2(μ2-Me)4] (3) in 87% yield. In this transformation, each of the four[Lu-μ2-CH2] methylidene groups in 1reacted with one molecule of H2to give a mixedmethyl/hydride “Lu(H)CH3” unit. The reactionof 1with [PhMe2NH][B(C6F5)4] gave the cationic tetrametallic lutetium monomethyltrimethylidene complex [Cp′4Lu4(μ3-CH2)3(μ3-CH3)][B(C6F5)4] (4) in85% yield, through protonation of one of the four methylidene unitsin 1with the anilinium borate. In contrast, the reactionof the trimetallic hexamethyl complex 2with H2led to formation of a tetrametallic lutetium monohydride heptamethylcomplex [Cp′4Lu4(μ4-H)(μ3-Me)(μ2-Me)6] (5)in 65% yield, while the protonation reaction of 2with3 equiv of [Et3NH][BPh4] gave a monometalliclutetium monomethyl contact-ion-pair complex [Cp′LuMe(η6-Ph)(η1-Ph)BPh2] (6) in 81% yield. Complexes 3–6werefully characterized by 1H and 13C NMR, single-crystalX-ray diffraction, and micro elemental analyses. [ABSTRACT FROM AUTHOR]

Published
2013
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