Preparation and Functionalization of a Range of Main-Group Trifluoropropynyl Organometallic Compounds: The Application of Metalloid-Directed Carbolithiation to the Selective Synthesis of Novel Fluorocarbon Fragments
作者:Alan K. Brisdon、Ian R. Crossley、Robin G. Pritchard、Ghazala Sadiq、John E. Warren
DOI:10.1021/om034146t
日期:2003.12.1
with 3 equiv of n-butyllithium at −10 °C leads to the generation of trifluoropropynyllithium in excellent yields. This reagent reacts readily with a range of group 14 electrophiles R4-nEXn (R = Ph, Et; E = C, Si, Ge, Sn, Pb; X = Cl, Br) to yield the organometalloid trifluoropropynyl compounds R4-nE(C⋮CCF3)n. Three of these compounds, Ph3EC⋮CCF3 (E = C, Si, Ge), have been crystallographically characterized
1,1,1,1,3,3-五氟丙烷(CF 3 CH 2 CF 2 H,HFC-245fa)与3当量的正丁基锂在-10°C的反应导致三氟丙炔基锂的产生,产率极高。该试剂容易与一系列第14组亲电试剂R 4 - n EX n(R = Ph,Et; E = C,Si,Ge,Sn,Pb; X = Cl,Br)反应生成有机金属三氟丙炔基化合物R 4 - ñ è(C⋮CCF 3)ñ。其中的三种化合物,Ph 3 EC⋮CCF 3(E = C,Si,Ge)在晶体学上已经表征,代表了对这些材料的首次此类研究。硅烷博士3的SiC⋮CCF 3已经通过与反应的LiAlH衍生4和一系列有机锂试剂(RLi的,R =的Ñ -Bu,PH,吨-Bu),得到一个新的系列的β-CF 3 -取代的乙烯基硅烷类型为Ph 3 SiCH C(CF 3)R,在双键处主要为E几何形状。在R =n- Bu,t- Bu和Ph的情况下,这些材料已经