Amino‐Modified Polymer Immobilized Ionic Liquid Stabilized Ruthenium Nanoparticles: Efficient and Selective Catalysts for the Partial and Complete Reduction of Quinolines

RuNPs stabilised by amino-decorated imidazolium-based polymer immobilized ionic liquids catalyse the dimethylamine borane mediated reduction of quinolines to 1,2-dihydroquinoline (DHQ) and 1,2,3,4-tetrahydroquinoline (THQ). Partial 3-substituted corresponding was achieved with 100% selectivity in toluene under mild conditions. This is first report selective partial 1,2-dihydroquinolines a heterogeneous nanoparticle-based catalyst. A wide range substituted have also been reduced high good yields adjusting reaction time. The readily release dihydrogen at 60 °C absence catalyst no evidence for disproportionation as such are potential organo-hydride reagents. initial TOF 610 mol quinoline converted Ru-1 h-1 among highest be reported metal conversion 96% obtained after 4 h 65 ºC significantly higher than its platinum nanoparticle counterpart [email protected] well 5 wt/% Ru/C, which only reached 9% 11% conversion, respectively, same Hot filtration experiments showed that active species heterogeneous.