[摘要]：Pd anchored on org.-inorg. (silica gel) hybrid materials behaves as a very efficient heterogeneous catalyst in the Heck reaction. Iodo- and bromo arenes react smoothly with alkenes to afford the corresponding cross-coupling products in good to excellent yields under phosphine- and amine-free conditions in the presence of a Pd anchored on L-proline-functionalized silica gel as catalyst. The SiO2-supported Pd catalyst can be recovered and recycled by simple filtration of the reaction soln., and used for >14 consecutive trials without significant loss of its catalytic activity.
