Synthesis, complexation behavior and application of a new diphosphite ligand in rhodium-catalyzed hydroformylation
作者:Igor S. Mikhel、Natalia V. Dubrovina、Ivan A. Shuklov、Wolfgang Baumann、Detlef Selent、Haijun Jiao、Andrea Christiansen、Robert Franke、Armin Börner
DOI:10.1016/j.jorganchem.2011.05.004
日期:2011.9
Oxidative coupling of 3-(3-tert-butyl-4-hydroxyphenyl)propionic acid methyl ester (2) gave dimethyl 3,3′-(5,5′-di-tert-butyl-6,6′-dihydroxybiphenyl-3,3′-diyl)-dipropionate (1c), which upon phosphorylation/transesterification with a phosphochloridite derived from (R)-binaphthol, formed the new unsymmetrical binaphthol-bridged diphosphite 4. A rhodium catalyst based on 4 as ligand gave predominantly
3-(3-叔丁基-4-羟苯基)丙酸甲酯(2)的氧化偶联得到二甲基3,3'-(5,5'-二叔丁基-6,6'-二羟基联苯-3 ,3'-二基)-二丙酸酯(1c),在磷酸化/酯交换反应中衍生自(R)-联萘酚的次氯酸盐,形成了新的不对称联萘酚桥联的二亚磷酸酯4。基于4作为配体的铑催化剂在选择的苯乙烯的加氢甲酰化反应中主要产生等选择性,但与2,6-二取代的衍生物的区域选择性相反。通过使4与(acac)Rh(CO)反应合成了新的螯合金属配合物(acac)RhL,PdCl 2 L和PtCl 2 L如图2所示,分别为PdCl 2(MeCN)2和PtCl 2(COD)。所得化合物的结构基于1 H,13 C,31 P和195 Pt NMR光谱法和质谱数据确定。