Abstract
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 -.
| Original language | English |
|---|---|
| Pages (from-to) | 1141-1147 |
| Number of pages | 7 |
| Journal | Bulletin of the Chemical Society of Japan |
| Volume | 70 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1997 |
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Synthesis and properties of dimethyl-and monomethylbis(phosphite) palladium(II) complexes. / Kayaki, Yoshihito; Shimizu, Isao; Yamamoto, Akio.
In: Bulletin of the Chemical Society of Japan, Vol. 70, No. 5, 1997, p. 1141-1147.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Synthesis and properties of dimethyl-and monomethylbis(phosphite) palladium(II) complexes
AU - Kayaki, Yoshihito
AU - Shimizu, Isao
AU - Yamamoto, Akio
PY - 1997
Y1 - 1997
N2 - 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 -.
AB - 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 -.
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U2 - 10.1246/bcsj.70.1141
DO - 10.1246/bcsj.70.1141
M3 - Article
VL - 70
SP - 1141
EP - 1147
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
SN - 0009-2673
IS - 5
ER -