7701

7173

كارشناسي ارشد

شيمي معدني

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1391

ده،81ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

كاظم كرمي

شادپور ملك پور

17/2/92

حسن حدادزاده، امير عبدالملكي

شيمي

ID7173

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Using of palladium nanoparticles supported on crosslinked polystyrene as a heterogeneous catalyst in coupling reactions and oxidation of alcohol application of an orthopalladated complex as a homogeneous catalyst in coupling reactions Mahdiyeh Ghasemi Mahdiyeh Ghasemi@ch iut ac ir Date of Submission 2012 12 19 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Kazem Karami Karami@cc iut ac irAbstract Palladium based catalysts particularly nanoscale palladium particles have recentlydrawn enormous attention due to their versatile role in organic synthesis In this thesis palladium nanoparticles supported on styrene divinylbenzene were synthesized and used asheterogeneous catalyst in organic synthesis For this reason at first tris dibenzyliden eacetone dipalladium 0 complex was prepared by treating the system PdCl2 dba NaOActo give a dark purple precipitate The precipitate was removed washed and recrystallized Pd NPs was synthesized using an in situ technique in which prepared Pd2 dba 3 butan 1 ol styrene divinylbenzene was used as the precursors of the catalyst The mixture wasstirred at 90 C for 6h and after cooling to r t AIBN initiator was added and the mixturewas further stirred at 90 C for 4h X ray diffraction XRD scanning electron microscopy SEM and transmission electron microscopy TEM showed that the palladium particleswere well dispersed within the polymer matrix and were typically about 50 nm indiameter The catalyst was crushed into a gray powder and used for Suzuki coupling andoxidation reaction of alcohols and showed excellent yields The recyclability of catalystwas tested and results indicated that S dvb stabilized pd 0 nanoparticles catalysts could bereused in several successive runs without significant loss of initial activity In the present study we have also investigated application of the palladacycle Pd C1 P OPh 2 OC6H4 2 as an efficient catalyst for the Suzuki and Heck cross coupling reactions of various aryl halides In the Suzuki reactions the correspondingproducts were obtained with yields in the range 40 100 and 25 100 in the Heckreactions It is the advantage of these methods that Suzuki reaction of aryl halides witharylboronic acid was done at room temperature and the Heck reaction was worked wellalso in air thus simplifying the work up of the catalytic process Keywords Heterogeneous catalyst Homogeneus catalyst Suzuki reaction Oxidation ofalcohols Heck reaction

كاظم كرمي

شادپور ملك پور

حسن حدادزاده، امير عبدالملكي