The new PPA ligands 3‐[5‐methyl‐3‐(trifluoromethyl)‐1H‐pyrazol‐1‐yl]propanamide (CF₃MePPA; 3) and 3‐[3,5‐bis(trifluoromethyl)‐1H‐pyrazol‐1‐yl]propanamide ((CF₃)₂PPA; 4) were synthesized by Aza‐Michael addition of the specific pyrazole derivatives to acrylamide. Both products were characterized by elemental analyses, IR and NMR spectroscopy, and mass spectrometry. X‐Ray structure determination of 3 revealed the presence of a one‐dimensional hydrogen‐bonded structure in the solid state. The ligating ability of the new ligands towards PdCl₂ was studied, showing that 3 behaves similar to Me₂PPA and reacts cleanly with PdCl₂ to afford the sparingly soluble complex PdCl₂(CF₃MePPA‐κN)₂. By contrast, the donor ability of pyrazolyl group in 4 was found to be considerably reduced, thus resulting in the formation of the unusual complex PdCl₂{(CF₃)₂PPA‐κN}{(CF₃)₂PPA‐κO}.

中文翻译：

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三氟甲基化3-（吡唑-1-基）丙酰胺（PPA）配体

新配体PPA 3- [5-甲基-3-（三氟甲基）-1 ħ -吡唑-1-基]丙酰胺（CF ₃ MePPA; 3）和3- [3,5-二（三氟甲基）-1 ħ -吡唑-1-基]丙酰胺（（CF ₃）₂ PPA; 4）通过氮杂合成迈克尔加成的特定吡唑衍生物，以丙烯酰胺。两种产品均通过元素分析，IR和NMR光谱以及质谱进行表征。X射线结构测定值3揭示了固态存在一维氢键结构。研究了新配体与PdCl ₂的连接能力，结果表明3行为类似于Me ₂ PPA，并与PdCl ₂干净反应，得到微溶的复合物PdCl ₂（CF ₃ MePPA- κN）₂。相比之下，发现4中的吡唑基的供体能力大大降低，从而导致形成异常的复杂PdCl ₂ {（CF ₃）₂ PPA‐ κN } {（CF ₃）₂ PPA‐ κO }。