Palladium complexes of bis(acyclic diaminocarbene) ligands with chiral N-substituents and 8-membered chelate rings
作者:Yoshitha A. Wanniarachchi、Sri S. Subramanium、LeGrande M. Slaughter
DOI:10.1016/j.jorganchem.2009.06.007
日期:2009.9
with N,N′-bis[(R)-1-(1-naphthyl)ethyl]-1,3-diaminopropane did not lead to an isolable bis(carbene) complex, instead forming significant amounts of bis(ammonium) salt as a decomposition product. However, reaction of the same palladium isocyanide precursor with a mixture of all diastereomers of N,N′-bis[1-(1-naphthyl)ethyl]-1,3-diaminopropane provided an achiral, Cs-symmetric palladium bis(acyclic diaminocarbene)
的反应顺-dichloridobis(p -trifluoromethylphenylisocyanide)钯(II)与Ñ,Ñ ' -双[([R)-1-苯乙基] -1,3-二氨基丙烷,得到对映体纯,c ^ 1 -对称双(无环diaminocarbene) PdCl 2络合物的产率为41%。该配合物的X射线晶体结构表明,四个卡宾氮中的三个被扭出了与卡宾单元的共轭,这显然是由于一个苯基与螯合物的丙烯主链之间的空间相互作用所致。用类似的反应Ñ,Ñ ' -双[(ř)-1-(1-萘基乙基)-1,3-二氨基丙烷不会生成可分离的双(卡宾)络合物,而是形成大量的双(铵)盐作为分解产物。然而,相同的钯异氰化物前体与N,N'-双[1-(1-(萘基)乙基] -1,3-二氨基丙烷的所有非对映异构体的混合物的反应提供了一个非手性,C s-对称的钯双(无环)二氨基卡宾)络合物仅由(R,S)二胺衍生而来,产率为20%。