Metal-Free Hydrogen Activation by the Frustrated Lewis Pairs of ClB(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub> and HB(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub> and Bulky Lewis Bases
作者:Chunfang Jiang、Olivier Blacque、Heinz Berke
DOI:10.1021/om900517d
日期:2009.9.14
[TMPH][Cl2B(C6F5)2] (1a), [t-Bu3PH][Cl2B(C6F5)2] (2a), and [Mes3PH][Cl2B(C6F5)2] (3a). [HB(C6F5)2]n forms Lewis adducts with TMP and t-Bu3P: TMP-BH(C6F5)2 (1b) and t-Bu3P-BH(C6F5)2 (2b). The Lewis adduct t-Bu3P-BH(C6F5)2 was found capable of generating a FLP at elevated temperature and was reacted with H2, producing the splitting product [t-Bu3PH][H2B(C6F5)2] (2c). Mes3P forms no Lewis adduct with [HB(C6F5)2]n
沮丧的路易斯对(FLP)从CLB(C衍生6 ˚F 5)2和笨重的路易斯碱-2,2,6,6-四甲基哌(TMP),三-叔丁基膦,和三(2,4,6-三甲基苯基)膦杂化裂解H 2形成中间体阴离子[HClB(C 6 F 5)2 ] -,该阴离子迅速与其余ClB(C 6 F 5)2进行氢化物/氯化物交换,得到已知化合物[HB( C 6 F 5)2 ] n(n= 1或2)和阴离子[Cl 2 B(C 6 F 5)2 ] -存在于产物[ TMP H] [Cl 2 B(C 6 F 5)2 ](1a),[ t -Bu 3 PH] [Cl 2 B(C 6 F 5)2 ](2a)和[Mes 3 PH] [Cl 2 B(C 6 F 5)2 ](3a)。[HB(C 6 F 5)2 ] Ñ与形式路易斯加合物TMP和吨-Bu 3,P:TMP -BH(C 6 ˚F 5)2(图1b)和吨-Bu 3 P-BH(C 6 ˚F 5)2(图2b)。发现路易斯加合物t