The stoichiometric reactions of phosphinimino-amino (PIA)-supported magnesium hydride complex 1, [L₁MgH]₂ (L₁ = (2,6-ⁱPr₂-C₆H₃)NC(Me)CHP(Cy₂)N(2,6-Me₂-C₆H₃)), with pyridine N-oxide and 2-phenylpyridine N-oxide afforded 2,4-pentadiene-1-oximate complex 2 and 5-phenyl-2,4-pentadiene-1-oximate complex 3, respectively. The reaction of 1 with 2-methylpyridine N-oxide showed a unique regioselectivity to produce 2,4-hexadiene-1-oximate 4a in toluene and 3,5-hexadiene-2-oximate 4b in THF, respectively. Treatment of β-diketiminato (BDI)-supported magnesium hydride complex 5, [L₂MgH]₂ (L₂ = (2,6-ⁱPr₂-C₆H₃)NC(Me)CHC(Me)N(2,6-ⁱPr₂-C₆H₃)), with quinoline N-oxide gave 1,2-dihydroquinoline type product 6, while treatment of complex 5 with 2-methylpyridine N-oxide either in toluene or THF afforded 1-methyl-2,4-pentadiene-1-oximate complex 7 as the only product. All these complexes were fully characterized by NMR spectroscopy and X-ray diffraction analyses, and mechanism researches were conducted to understand the ring-opening reaction of pyridine N-oxide.

中文翻译：

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氢化镁配合物的吡啶N-氧化物类似物的区域选择性开环反应

磷氨基氨基（PIA）负载的氢化镁配合物1，[L ₁ MgH] ₂（L ₁ =（2,6- ⁱ Pr ₂ -C ₆ H ₃）NC（Me）CHP（Cy ₂）的化学计量反应N（2,6-Me ₂ -C ₆ H ₃）），用吡啶N-氧化物和2-苯基吡啶N-氧化物得到2,4-戊二烯-1-肟酸酯络合物2和5-苯基-2,4-戊二烯-1-肟酸络合物3。1与2-甲基吡啶N的反应-氧化物显示出独特的区域选择性，以分别在甲苯中产生2,4-己二烯-1-肟基酯4a和在THF中产生3,5-己二烯-2-肟基酯4b。β-二酮基亚氨基（BDI）负载的氢化镁复合物5，[L ₂ MgH] ₂（L ₂ =（2,6- ⁱ Pr ₂ -C ₆ H ₃）NC（Me）CHC（Me）N（2）的处理，6- ⁱ Pr ₂ -C ₆ H ₃）），用喹啉N-氧化物得到1,2-二氢喹啉型产物6，同时用2-甲基吡啶处理配合物5在甲苯或THF中的N-氧化物提供作为唯一产物的1-甲基-2,4-戊二烯-1-肟酸酯络合物7。通过NMR光谱和X射线衍射分析充分表征了所有这些配合物，并进行了机理研究以了解吡啶N-氧化物的开环反应。