Synthesis and properties of dimethyl-and monomethylbis(phosphite) palladium(II) complexes

Yoshihito Kayaki, Isao Shimizu, Akio Yamamoto

研究成果: Article

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New dimethylpalladium complexes having alkyl and aryl phosphites as the supporting ligands, cis-[PdMe2{P-(OR)3}2] (R = Me, 1a; Ph, 1b), have been prepared by two routes, (1) by the reaction of [Pd(acac)2] with [AlMe2(OEt)] in the presence of the phosphite ligands, and (2) by the ligand exchange reaction of [PdMe 2(cod)] (COD= 1,5-cyclooctadiene) with two molar amounts of the phosphites. Monomethylpalladium chloride complexes, [PdMe(Cl){P(OR) 3}2] (R = Me, 2a; Ph, 2b; Pri, 2c) have been prepared by ligand exchange reaction of [PdMe(Cl)(cod)] with two molar amounts of the phosphites, whereas [PdMe(OAc){P(OR)3}2] (R = Me, 3a; Ph, 3b) has been synthesized by treatment of 1 with acetic acid. Strong influence of the coordinated phosphite ligand on the cis or trans configuration of the monomethylpalladium complexes was observed, the results being in contrast with those of complexes having the trimethylphosphine ligands that give preferentially trans complexes. Removal of the chloride ligand in 2 with an equimolar amount of AgBF4 or treatment of the dimethylpalladium complex 1 with HBF4 in the expectation of obtaining a bis(phosphite)-coordinated complex led to formation of a mixture of the tris(phosphite) complex, [PdMe{P(OR)3}3] +BF4 - and the mono-phosphite complex [PdMe{P(OR)3}(s)2]+BF4 - (s = solvent), presumably through the rapid disproportionation of an unstable intermediate [PdMe{P(OR)3}2(s)]+BF 4 -.

元の言語English
ページ(範囲)1141-1147
ページ数7
ジャーナルBulletin of the Chemical Society of Japan
70
発行部数5
DOI
出版物ステータスPublished - 1997

ASJC Scopus subject areas

  • Chemistry(all)

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