Rhodium(I) carbonyl complexes of tetradentate chalcogen functionalized phosphines, [P′(X)(CH2CH2P(X)Ph2)3] {X = O, S, Se}: Synthesis, reactivity and catalytic carbonylation reaction
作者:Biswajit Deb、Podma Pollov Sarmah、Kokil Saikia、Amy L. Fuller、Rebecca A.M. Randall、Alexandra M.Z. Slawin、J. Derek Woollins、Dipak Kumar Dutta
DOI:10.1016/j.jorganchem.2011.07.014
日期:2011.10
The reaction of [Rh(CO)2Cl]2 with 0.5 mol equivalent of the ligands [P′(X)(CH2–CH2P(X)Ph2)3](P′P3X4) where X = O(a), S(b) and Se(c)} affords tetranuclear complexes of the type [Rh4(CO)8Cl4(P′P3X4)] (1a–1c). The complexes 1a–1c have been characterized by elemental analyses, mass spectrometry, IR and multinuclear NMR spectroscopy, and the ligands b and c are structurally determined by single crystal
的[Rh(CO)的反应2 CL] 2用0.5摩尔当量的配位体[P的“ (X)(CH 2 -CH 2 P(X)PH 2)3 ](P ' P 3 X 4)其中X = O(一),S(b)和Se(C ^)},得到式[Rh中的四核配合物4(CO)8氯4(P ' P 3 X 4)](1A - 1C)。配合物1a - 1c通过元素分析,质谱,IR和多核NMR光谱对其进行了表征,并通过单晶X射线衍射在结构上确定了配体b和c。1a - 1c与CH 3 I进行氧化加成(OA)反应,生成Rh(III)氧化产物。1a和1b与过量CH 3 I反应的动力学数据表明是假一级反应。1a - 1c对甲醇羰基化为乙酸及其酯的催化活性显示出更高的转换频率(TOF = 1349–1748 h -1)与相似实验条件下的著名物种[Rh(CO)2 I 2 ] -(TOF = 1000 h -1)进行比较。但是,1b和1c的TOF低于