The ligands Y1 and Y2 were synthesized by the reaction of triphenylphosphine with a chloroform solution of 2-bromo-4-flouroacetophenone or 2-bromo-4-chloroacetophenone and dehydrogenated by NaOH. Treatment of Y1 or Y2 with Pd(OAc) 2 (1:1) in refluxing CH 2 Cl 2 , and further reactions of the dimeric acetato-bridge intermediates with excess NaCl in methanol gave complexes D1 or D2 as the yellow precipitates . The IR spectrum of Y 1 andY 2 shows a strong absorption at 1505-1512 cm -1 due to the carbonyl stretch. This band clearly appears at lower energies compared to those found in the phosphonium salts due to the charge delocalization present in this kind of compounds. Treatment of a or b with Pd(OAc) 2 (1:1)in refluxing CH 2 Cl 2 , and further reaction of the acetate intermediate with excess NaCl in methanol gives a yellow solid, whose corresponds to the complex 1 or 2 (Scheme 1). Y l or Y 2 can undergo a C-H activation process at two different positions, almost equivalents, namely the 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-coordinated complexes with a chlorobridged dimeric structure. The ortho-palladated dinuclear complexes [Pd(µ-Cl){ C,C -{CH[P(C 6 H 4 -2)Ph 2 ][C(O)C 6 H 4 X-4}}] 2 (X = F( D1 ) and Br( D2)) are prepared by the reaction of phosphorus ylides Ph 3 PCH(CO)C 6 H 4 X-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(C 6 H 4 -2)Ph 2 ][C(O)C 6 H 4 X-4]}}L] (L= PPh 3 (X = F ( D1 a ), Br ( D2 a )), 3-methylpyridine (MePy) (X = F ( D1 b ), Br ( D2 b )), 2,4,6-tromethylpyridine (Me 3 Py) (X = F ( D1 c ) At the following, the application of complexes of D1 , D1 a and D2 a as catalysts in Suzuki cross-coupling reaction is examined.
