CAJ | 학술논문

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.
수차제비료십이완기류산근(DS)삽층수활석부재적납미파무련배체형적Suzuki우련반응최화제.DS-진입도수활석층간,사층간거종미공증지2.9nm,종이유리우중등척도적유궤분자재최화제표면적확산.진일보이PdCl42-교환해수활석득도DS-화PdCl42-쌍삽층적수활석.환원후가득도층간삽유금속파납미단족적수활석.유우DS-삽층후재수활석층판간형성적공간유한,한제료Pd0단족적진일보생장.작위일충친유성적비균상최화제,해류최화제가유효촉진서대방경여분붕산적Suzuki우련반응.최화제순배사용5차후활건기본득이보지.
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.