Dodecylsulfate Anion Embedded Layered Double Hydroxide Supported Nanopalladium Catalyst for the Suzuki Reaction

The dodecylsulfate anion (DS-) embedded layered double hydroxide (LDH) supported nanopalladium catalyst (LDH-DS-Pd-0) is a novel phosphine free recyclable heterogeneous catalytic system for palladium catalyzed Suzuki coupling reactions and has been prepared for the first time. The intercalation of DS(-)changed the interlayer spacing of LDH from a microsize to a mesosize (2.9 nm) range, which favors the diffusion of average sized organic molecules. The Pd-0 clusters obtained from the reduction of PdCl42--interlayered LDH were intercalated between the LDH layers and hence the growth of Pd-0 clusters was effectively hindered by the limited space created by the intercalation of DS-. This lipophilic catalyst was highly efficient in promoting the Suzuki reaction of aryl halides with phenylboronic acid. As a heterogeneous nanocatalyst, LDH-DS-Pd-0 could be reused five times without significant loss of catalytic activity.