氟化环己烷衍生物的生产是通过在分子改性的二氧化硅载体(Rh @ Si–R)上作为高效且可回收的催化剂,使用Rh纳米粒子对易得的氟化芳烃进行选择性氢化来完成的。催化剂制备包括将非极性分子实体接枝在SiO 2表面上,从而产生疏水性环境,以控制从简单的有机金属前体中沉淀出明确的铑颗粒。各种氟化环己烷衍生物被证明具有出色的功效(0.05–0.5 mol%Rh,10–55 bar H 2,80–100°C,1-2小时),包括与工业相关的构建基块。添加CaO作为痕量HF的清除剂可大大提高催化体系的可回收性,并防止与HF存在相关的风险,而不会影响反应的活性和选择性。
Methods of halogenating a carbon containing compound having an sp3 C—H bond are provided. Methods of fluorinating a carbon containing compound comprising halogenation with Cl or Br followed by nucleophilic substitution with F are provided. Methods of direct oxidative C—H fluorination of a carbon containing compound having an sp3 C—H bond are provided. The halogenated products of the methods are provided.
arenes using Rh nanoparticles on molecularly modified silica supports (Rh@Si–R) as highly effective and recyclable catalysts. The catalystpreparation comprises grafting non-polar molecular entities on the SiO2 surface generating a hydrophobic environment for controlled deposition of well-defined rhodium particles from a simple organometallic precursor. A broad range of fluorinated cyclohexane derivatives
氟化环己烷衍生物的生产是通过在分子改性的二氧化硅载体(Rh @ Si–R)上作为高效且可回收的催化剂,使用Rh纳米粒子对易得的氟化芳烃进行选择性氢化来完成的。催化剂制备包括将非极性分子实体接枝在SiO 2表面上,从而产生疏水性环境,以控制从简单的有机金属前体中沉淀出明确的铑颗粒。各种氟化环己烷衍生物被证明具有出色的功效(0.05–0.5 mol%Rh,10–55 bar H 2,80–100°C,1-2小时),包括与工业相关的构建基块。添加CaO作为痕量HF的清除剂可大大提高催化体系的可回收性,并防止与HF存在相关的风险,而不会影响反应的活性和选择性。