Phosphonium bis(glycolates) and phosphinoglycolates: Synthesis, solvolysis, oxidation to (thio)phosphinoylglycolates and use as ligands in Ni-catalyzed ethylene oligomerization
作者:Normen Peulecke、Markus K. Kindermann、Martin Köckerling、Joachim Heinicke
DOI:10.1016/j.poly.2012.04.019
日期:2012.6
the kinetic lability, the phosphonium compounds 1a–d are sensitive to oxidation by air, H2O2, or sulfur. The resulting phosphinoyl and thiophosphinoyl glycolates and glycolic acids 5–8 are kinetically stable. Precatalyst solutions formed from 1a, c, d and Ni(COD)2 in THF developed moderate to good activity in the oligo- or polymerization of ethylene to linear products containing methyl and vinyl end
仲膦,乙醛酸水合物和胺反应形成有机铵双(乙醇酸)phospho 1a – d。在CD 3 OD溶液中,二苯基乙醇酸双(乙醇酸酯)经历可逆的溶剂分解,生成膦酸乙醇酸酯2a,b和乙缩醛乙醛酸类物质。P-二烷基物质1c避免了这种情况,并在CD 3 OD(c Hex 2 P)中保持了双(乙醇酸)phospho结构,或进行了进一步的溶剂分解,部分形成了R 2 PH(R = t Bu)。缩合为膦基甘氨酸,例如3b在室温下,对于N-仲胺,不会观察到对N-仲胺的反应。加热导致缩合,但随后发生脱羧,如所示的2a到4a的转化。由于动力学上的不稳定性,compounds化合物1a – d对空气,H 2 O 2或硫的氧化敏感。将得到的膦和thiophosphinoyl甘醇酸酯和乙醇酸5 - 8是动力学稳定的。由1a,c,d和Ni(COD)2形成的预催化剂溶液在THF的低聚或聚合反应中,生成四氢呋喃的中间体具有中