highest reactivity to its derivative (complex 1A). The most surprising issue was however represented by the olefin which seems to affect heavily the reactivity of the starting substrate thereby increasing the overall reactionrate. The most active olefins were ma and fn. In the case of the reaction between the complex 1A and tributyl-phenylethynyl-stannane in the presence of fn an exhaustive kinetic study
Several new allenyl and propargyl complexes have been obtained by oxidative addition with propargyl chlorides of palladium (0) olefin complexes stabilized by N−N, P−P, N−P, N−S. and N−C homo− and hetero−ditopic spectator ligands. The oxidative addition of some of the isolated palladium(0) olefin derivatives with 3−chloro−1−propyne and 3−chloro−1− phenyl−propyne has been investigated and the ensuing
the allyl dimers [Pd(μ-Cl)(η3-C3H5)]2 and [Pd(μ-Cl)(η3-C3H3Me2)]2, yielding palladiumallyl phosphanylquinoline complexes whose structure is strongly influenced by the ancillary ligand and the presence or the absence of chloride ion in solution. Thus, the allyl fragments in the DPPQ derivatives assume η3-hapticity in the absence of chloride and display monohapto coordination when the chloride is not
bidentate P,N-chelating or monodentate P-donating quinolylphosphine ligands in the cis(P,P) configuration. A large steric requirement from the Me or Ph substituent introduced at the 2-position of the quinoline ring gives the resulting complexes severe distortion. The PtII and PdII complex cations maintained the square-planar coordination geometry, but the MII center was displaced from the chelating ligand
合成了几个带有8-(二苯基膦基)喹啉(PQ H)或其2-甲基或2-苯基衍生物(PQ Me或PQ Ph)的铂(II),钯(II)和镍(II)配合物系列,研究了它们的晶体结构和在溶液中的行为。在这项研究中表征的大多数络合物[M(PQ R)2 ] X 2(M II = Pt II,Pd II或Ni II; R = H,Me或Ph; X =单阴离子)具有两个双齿P,N螯合或单齿P的平面配位几何-顺式(P,P)构型的供体喹啉基膦配体。喹啉环2位上引入的Me或Ph取代基对空间的要求很高,导致所得络合物严重变形。Pt II和Pd II配位阳离子保持方形平面配位几何,但M II中心从螯合配体平面移开。螯合配位基团的这种弯曲使M–N(喹啉)键变弱,如更长的M–N键所示。随着键的减弱,PQ H或PQ Me的部分解离通过紫外可见光谱和X射线晶体学观察到被卤化物阴离子取代的螯合剂。相反,PQ Ph络合物在溶液中对
Insertion of Isocyanides across the Pd−C Bond in Alkyl or Aryl Palladium(II) Complexes Bearing Mixed Nitrogen−Sulfur and Nitrogen−Phosphorus Ancillary Ligands. The Mechanism of Reaction
and arylpalladium complexes bearing pyridyl−thioethers (NS−R) and quinoline−phosphines (NP) as ancillary ligands when reacting with 2,6-dimethyl isocyanide (DIC) and tosylmethyl isocyanide (TosMIC) was undertaken. In these reactions some differently substituted isocyanides insert into the palladium−carbon bond of alkyl and aryl complexes bearing mixed (NS or NP) ligands. The reactions were carried out
详尽研究了与2,6-二甲基异氰化物(DIC)和甲苯磺酰基甲基异氰化物反应时带有吡啶基-硫醚(NS-R)和喹啉-膦(NP)作为辅助配体的烷基和芳基钯配合物的动力学和机理(TosMIC)进行了。在这些反应中,一些不同取代的异氰酸酯插入带有混合(NS或NP)配体的烷基和芳基络合物的钯碳键中。反应是在等分子条件下进行的,因为这种限制性方法可以确定与异氰酸酯插入攻击有关的速率常数。还考虑了在非化学计量条件下进行的反应,并对反应产物进行了表征。通常观察到插入的钯(II)的双取代的异氰化物卤化物衍生物的形成。在特定情况下,检测到酰亚胺基二聚体的形成。单插入[Pd(NSt -Bu)(C(Tol)NR 2)I](NS t -Bu = 2-(叔丁基硫甲基)吡啶)和二聚体[Pd(CNR 2)(C(NR 2)Me)Cl] 2据报道(R 2= 2,6-Me 2 C 6 H 3)。