title: Synthesis and NMR-study of the 2,3,4,5-tetraethylsilole dianion [SiC₄Et₄]²⁻•2[Li]⁺.
abstract: The previously unknown silole dianion [SiC(4)Et(4)]²⁻•2[Li]+ (3) was prepared by the sonication of 1,1-dichloro-2,3,4,5-tetraethyl-1-silacyclopentadiene [Cl(2)SiC(4)Et(4), 2] with more than four equivalent of lithium in THF. 1H-, 13C-, and 29Si-NMR data of 3 are compared with those of the reported silole dianion [SiC(4)Ph(4)]²⁻. Trapping of 3 with trimethylchlorosilane gave 1,1-bis(trimethylsilyl)-2,3,4,5-tetraethyl-1-silacyclopentadiene [(Me(3)Si)(2)SiC(4)Et(4), 4] in high yield. The silole of 2 was synthesized in high yield in three steps by a modified procedure using Cp(2)ZrCl(2) via Cp(2)ZrC(4)Et(4) and 1,4-dibromo-1,2,3,4-tetraethyl-1,3-butadiene.
authors.affiliation: Department of Nanopolymer Material Engineering, Pai Chai University, 155-40 Baejae-ro (Doma-Dong), Seo-Gu, Daejon 302-735, Korea. jhong@pcu.ac.kr
authors.forename: Jang-Hwan
authors.initials: JH
authors.lastname: Hong
mesh_terms: D000838:Anions; D005663:Furans / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D017646:Organosilicon Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D012997:Solvents
chemical_list: C568728:2,3,4,5-tetraethylsilole dianion (SiC4Et4)(2).2(Li)+; D000838:Anions; D005663:Furans; D017646:Organosilicon Compounds; D012997:Solvents; C018674:tetrahydrofuran