1,4-Bis(trimethylsilyl)-1,4-diaza-2,5-cyclohexadienes as Strong Salt-Free Reductants for Generating Low-Valent Early Transition Metals with Electron-Donating Ligands
作者:Teruhiko Saito、Haruka Nishiyama、Hiromasa Tanahashi、Kento Kawakita、Hayato Tsurugi、Kazushi Mashima
DOI:10.1021/ja501313s
日期:2014.4.2
reduction of Cp2TiCl2, for which compounds 2a and 4 gave the corresponding one-electron reduced products, pyrazine-bridged and 4,4'-bipyridyl-bridged dimeric Ti(III) complexes 5 and 6, and compounds 2b and 2c afforded the same double chloride-bridged dimeric Ti(III) complex, [Cp2Ti]2(μ-Cl)2 (7), though 1a and 1b could not reduce Cp2TiCl2. Application of the organosilicon compounds as reducing agents for catalytic
富电子有机硅化合物,例如 1,4-双(三甲基甲硅烷基)-1,4-二氮杂-2,5-环己二烯 (2a)、2,5-二甲基-1,4-双(三甲基甲硅烷基)-1,4 -二氮杂-2,5-环己二烯(2b)、2,3,5,6-四甲基-1,4-双(三甲基甲硅烷基)-1,4-二氮杂-2,5-环己二烯(2c)和1,1 '-bis(trimethylsilyl)-1,1'-dihydro-4,4'-bipyridine (4), 作为 4-6 族金属氯化物络合物的通用还原剂,如 Cp2TiCl2、Cp*2TiCl2 (Cp* = η (5)-C5Me5)、Cp*TiCl3、Cp*TaCl4 和 WCl4(PMe2Ph)2,以无盐方式生成相应的低价金属物种。含氮还原剂,如 2a-c 和 4,比母体有机硅还原剂 3,6-双(三甲基甲硅烷基)-1,4-环己二烯 (1a) 和 1-甲基-3,6-双具有更强的还原能力(三甲基甲硅烷基)-1