Preparation and application of air-stable P,N-bidentate ligands for the selective synthesis of δ-lactone via the palladium-catalyzed telomerization of 1,3-butadiene with carbon dioxide
作者:Yao Dai、Xiujuan Feng、Bin Wang、Ren He、Ming Bao
DOI:10.1016/j.jorganchem.2011.10.011
日期:2012.1
L1–L7 with cyclic secondary amine moieties linked to the benzene rings of triphenylphosphine were designed and prepared. The chelating coordination mode of the P,N-bidentate ligands to the Pd(II) center was confirmed by determining the X-ray structures of the Pd(II) complexes C1 and C2 derived from ligands L1 and L2, respectively. The ligands were used for the selective synthesis of δ-lactone through the
设计并制备了具有环仲胺部分与三苯膦苯环连接的P,N形的空气稳定的P,N齿状配体L1 - L7。通过确定分别衍生自配体L1和L2的Pd(II)配合物C1和C2的X射线结构,证实了P,N-二齿配体与Pd(II)中心的螯合配位模式。配体用于选择性合成δ-钯通过钯(Pd)催化1,3-丁二烯与二氧化碳的端粒化反应。使用Pd 2(dba)3 / 4-(2-(2-(二苯基膦基)苯基)吗啉(L2)催化剂体系观察到最高收率(60%,选择性为79%)。