Sterically Demanding Diphosphonite Ligands–Synthesis and Application in Nickel-Catalyzed Isomerization of 2-Methyl-3-Butenenitrile
作者:Jarl Ivar van der Vlugt、Alison C. Hewat、Samuel Neto、Rafael Sablong、Allison M. Mills、Martin Lutz、Anthony L. Spek、Christian Müller、Dieter Vogt
DOI:10.1002/adsc.200303240
日期:2004.7
of these diphosphonite ligands towards Ni(II) and Ni(0) precursors is investigated, both by NMR spectroscopy as well as X-ray crystallography and compared with the behaviour of diphosphine ligands such as Xantphos. The molecular structure for complex 9, trans-[NiBr2(1)] is described in detail. The nickel-catalyzed isomerization of 2-methyl-3-butenenitrile to 3-pentenenitrile is studied, a relevant
一类新的空间要求的二亚膦酸酯的合成1 - 8,根据刚性骨架,进行说明。起始原料都是可商购的,并且该方法允许采用模块化方法。所有配体已被充分表征,包括X射线晶体结构为化合物1,4,5-双二[(2-叔丁基)苯基] phosphonito} -9,9-二甲基呫。通过NMR光谱以及X射线晶体学研究了这些二膦酸酯配体对Ni(II)和Ni(0)前体的配位,并与二膦配体(如Xantphos)的行为进行了比较。配合物9的分子结构,反式-[NiBr 2((1)]被详细描述。研究了2-甲基-3-丁烯腈在镍催化下异构化为3-戊烯腈的方法,这是丁二烯在工业上重要的氢氰化的重要步骤(杜邦己二腈工艺)。在这种可逆的CC键活化反应中,获得了对所需的3-戊烯腈的良好活性和选择性。