摘要:
Ferrocene reacts with hexafluoroacetone trihydrate in refluxing octane to afford > 80% yields of [CpFe(eta(5)-C5H4C(CF3)(2)OH)] (X-ray), carrying out the reactions at 180 degrees C gives an additional 5% yield of [Fe(eta(5)-C5H4C(CF3)(2)OH)(2)] (X-ray). The mono alcohol is lithiated with Bu'OK/Bu"Li/TMEDA affording partial conversion to mixtures of [CpFe(1,2-eta(5)-C5H3C(CF3)(2)OH)(X)] and [Fe(eta(5)-C5H4X)(1,2-eta(5)- C5H3C(CF3)(2)OH)(X)] (X = SMe, CPh2OH) upon reaction with Me2S2 or O=CPh2. For X = CPh2OH both structures are crystallographically characterised. Enantiopure [CpFe(1,2-eta(5)-C5H3C(CF3)(2)OH)(SMe)] can be prepared from (R)-[CpFe(eta(5)-C5H4S(O)C6H4Me)] via [CpFe(1,2-eta(5)-C5H3S(O)C6H4Me)(C(CF3)(2)OH)] (X-ray) or [CpFe(1,2-eta(5)-C5H3S(O)C6H4Me)(SMe)]. Related procedures allow the preparation of [CpFe(1,2-eta(5)-C5H3CPh2OH)(Y)] (Y = SMe, CHO (X-ray), C(CF3)(2)OH) and (CpFe(1,2-eta(5)-C5H3C(CF3)(2)OH)(CHO)]. (c) 2005 Elsevier B.V. All rights reserved.