Synthesis and insertion reactions of the cyclometalated palladium-alkyl complexes Pd(CH2CMe2-o-C6H4)L-2. Observation of a pentacoordinated intermediate in the insertion of SO2

Campora J; Lopez JA; Palma P; del Rio D; Carmona E; Valerga P; Graiff C; Tiripicchio A

Inorganic Chemistry, Vol.40, No.17, 4116-4126, 2001

Campora J, Lopez JA, Palma P, del Rio D, Carmona E, Valerga P, Graiff C, Tiripicchio A

Palladacycles of the type Pd(CH2CMe2-o-C6H4)L-2, 2, have been synthesized by treatment of the corresponding chloroalkylcomplexes Pd(CH(2)cMe(2)C(6)H(5))ClL2 (L-2 = (PMe3)(2), 2a, or 1,5-cyclooctadiene (cod), 2b) with suitable bases, or by simple ligand exchange reactions from the cyclooctadiene derivative 2b. The metallacycles 2 react with activated alkynes and with sulfur dioxide, giving rise to different insertion products.