首次制备了十二烷基硫酸根(DS)插层水滑石负载的纳米钯无膦配体型的Suzuki偶联反应催化剂.DS-进入到水滑石层间,使层间距从微孔增至2.9nm,从而有利于中等尺度的有机分子在催化剂表面的扩散.进一步以PdCl42-交换该水滑石得到DS-和PdCl42-双插层的水滑石.还原后可得到层间插有金属钯纳米团簇的水滑石.由于DS-插层后在水滑石层板间形成的空间有限,限制了Pd0团簇的进一步生长.作为一种亲油性的非均相催化剂,该类催化剂可有效促进卤代芳烃与苯硼酸的Suzuki偶联反应.催化剂循环使用5次后活件基本得以保持.
The dodeeylsulfate anion(DS-)embedded layered double hydroxide(LDH)supported nanopalladium catalyst(LDH-DS·Pdu)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 nn])range,which favors the diffusion of average sized organic molecules.The pd0 clusters obtained from the reduction of PdCl42-interlayered LDH were intercalated between the LDH layers and hence the growth of pd0 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 phenylbomnic acid.As a heterogene-Oils nanocatalyst.LDH.DS.Pd0 could be reused five times without significant loss ofcatalytic activity.
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