Frustrated β-Chloride Elimination. Selective Arene Alkylation by α-Chloronorbornene Catalyzed by Electrophilic Metallocenium Ion Pairs
作者:Aswini K. Dash、Tryg R. Jensen、Charlotte L. Stern、Tobin J. Marks
DOI:10.1021/ja047828w
日期:2004.10.1
Single-site polymerization catalysts generated in situ via activation of Cp*MMe3 (Cp* = C5Me5; M = Ti, Zr), (CGC)MMe2 (CGC = C5Me4SiMe2NBut; M = Ti, Zr), and Cp2ZrMe2 with Ph3C+B(C6F5)4- catalyze alkylation of aromatic molecules (benzene, toluene) with α-chloronorbornene at room temperature, to regioselectively afford the 1:1 addition products exo-1-chloro-2-arylnorbornane (aryl = C6H5 (1a), C6H4CH3
通过活化 Cp*MMe3 (Cp* = C5Me5; M = Ti, Zr)、(CGC)MMe2 (CGC = C5Me4SiMe2NBut; M = Ti, Zr) 和 Cp2ZrMe2 与 Ph3C+B( C6F5)4- 在室温下催化芳香分子(苯、甲苯)与 α-氯降冰片烯的烷基化反应,区域选择性地提供 1:1 加成产物外型-1-氯-2-芳基降冰片烷(芳基 = C6H5 (1a)、C6H4CH3 ( 1b)) 收益良好。类似的氘标记产物 exo-1-chloro-2-aryl-dn-norbornane-7-d1 (aryl-dn = C6D5 (1a-d6), C6D4CD3 (1b-d8)) 通过 α-氯代降冰片烯的催化芳基化获得在苯-d6 或甲苯-d8 中。分离的离子对复合物如 (CGC)ZrMe(甲苯)+B(C6F5)4- 和 Cp*2ThMe+B(C6F5)4- 也催化 α-氯降冰片烯在甲苯-d8