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Highly Twisted Ethylene Dianion Dilithium Stabilized by Phenyl and Silyl Groups

1995; Oxford University Press; Volume: 68; Issue: 11 Linguagem: Inglês

10.1246/bcsj.68.3215

1348-0634

Akira Sekiguchi, Masaaki Ichinohe, Tetsuo Nakanishi, Chizuko Kabuto, Hideki Sakurai,

Organometallic Complex Synthesis and Catalysis

Phenyl- and silyl-substituted ethylene dianion dilithiums, [1-phenyl-1,2,2-tris(trimethylsilyl)ethylene]{bis[(dimethoxyethane)lithium(I)]} (2) and [1,1-diphenyl-2,2-bis(trimethylsilyl)ethylene][tris(tetrahydrofuran)dilithium(I)] (4), were prepared and characterized by X-ray crystallography as well as NMR spectra. The crystal structures of 2 and 4 revealed interesting structural features. One of the lithium cations was located near to the two central carbon atoms, ipso and ortho carbons of the phenyl ring, while the other one was found above the benzene ring. The central C–C bond is twisted by ca. 90° for 2 and ca. 70° for 4.