5108

4798

كارشناسي ارشد

شيمي معدني

اصفهان: دانشگاه صنعتي اصفهان،دانشكده شيمي

1388

دوازده،231ص.:مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

كاظم كرمي

89/1/23

حسن حدادزاده،ولي ا.. ميرخاني

شيمي

ID4798

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

abstract The ligands Y1 and Y2 were synthesized by the reaction of triphenylphosphine with achloroform solution of 2 bromo 4 flouroacetophenone or 2 bromo 4 chloroacetophenone anddehydrogenated by NaOH Treatment of Y1 or Y2 with Pd OAc 2 1 1 in refluxing CH2Cl2 andfurther reactions of the dimeric acetato bridge intermediates with excess NaCl in methanol gavecomplexes D1 or D2 as the yellow precipitates The IR spectrum of Y1 andY2 shows a strong absorption at 1505 1512 cm 1 due to the carbonylstretch This band clearly appears at lower energies compared to those found in the phosphoniumsalts due to the charge delocalization present in this kind of compounds Treatment of a or b withPd OAc 2 1 1 in refluxing CH2Cl2 and further reaction of the acetate intermediate with excessNaCl in methanol gives a yellow solid whose corresponds to the complex 1 or 2 Scheme 1 Ylor Y2 can undergo a C H activation process at two different positions almost equivalents namelythe phenyl ring of the benzoyl fragment and the phenyl ring of the phosphine group Scheme 2 Reactions of Pd OAc 2 with the ylide in a 1 1 stoichiometry afforded the C C coordinatedcomplexes with a chlorobridged dimeric structure The ortho palladated dinuclear complexes Pd Cl C C CH P C6H4 2 Ph2 C O C6H4X 4 2 X F D1 and Br D2 are prepared by the reaction of phosphorus ylidesPh3PCH CO C6H4X 4 X F Y1 or Br Y2 using two different methods a b methods Complexes D1 and D2 react with various ligands L to give PdCl C C CH P C6H4 2 Ph2 C O C6H4X 4 L L PPh3 X F D1a Br D2a 3 methylpyridine MePy X F D1b Br D2b 2 4 6 tromethylpyridine Me3Py X F D1c At the following the application of complexes of D1 D1a and D2a as catalysts in Suzuki cross coupling reaction is examined

كاظم كرمي

حسن حدادزاده،ولي ا.. ميرخاني