characterized by 1H NMR spectroscopic analyses. The structures of complexes 2, 3, 4, and 6 were determined by single‐crystal X‐ray analyses. Study of the catalytic activities of the complexes showed that these rare earth metal amido complexes were excellent catalysts for hydrophosphonylations of aldehydes and unactivated ketones. The catalyzed reactions between diethylphosphite and aldehydes in the presence
通过甲硅烷基胺消除反应制备了一系列带有亚甲基连接的吡咯基-酰胺基配体的稀土金属酰胺配合物,在无溶剂条件下,液态底物在醛和未活化酮的氢膦酰化反应中显示出很高的催化活性。的治疗[(ME 3 Si)的2 N] 3 LN(μ-Cl)的锂(THF)3与2-(2,6--ME 2 ç 6 ħ 3 NHCH 2)C 4 H ^ 3 NH(1,1个当量)在甲苯,得到相应的式三价稀土金属酰胺(μ-η 5:η 1):η 1-2-[(2,6-Me 2 C 6 H 3)NCH 2 ](C 4 H 3 N)LnN(SiMe 3)2 } 2 [Ln = Y(2),Nd(3),Sm(4),Dy(5),Yb(6)],产量适中。所有化合物均通过光谱法和元素分析充分表征。钇配合物的特征还在于1 H NMR光谱分析。复合物的结构 2,3,4,和6由单晶X射线分析确定。配合物催化活性的研究表明,这些稀土金属酰胺配合物是醛和未活化
The Preparation of Dialkyl 1-Hydroxyalkylphosphonates in the Reaction of Trialkyl Phosphites with Oxonium Salts Derived from Aldehydes or Ketones
作者:Mirosław Soroka、Waldemar Goldeman
DOI:10.1055/s-2006-950200
日期:——
The reaction of trialkylphosphites with aldehydes or ketones in the presence of hydrogen chloride gives dialkyl 1-hydroxy-alkylphosphonates via Arbusov-like reaction of oxonium salts derived from aldehydes or ketones. This reaction is a very convenient instant method for the preparation of dialkyl 1-hydroxyalkyl-phosphonates with a good yield as an alternative to the well-known Abramov reaction.
Rare-earth metal amido complexes supported by bridged bis(β-diketiminato) ligand as efficient catalysts for hydrophosphonylation of aldehydes and ketones
A series of rare-earth metal amides supported by a cyclohexyl-linked bis(β-diketiminato) ligand were synthesized, and their catalytic activities for hydrophosphonylation of aldehydes and ketones were developed. Reaction of [(Me3Si)2N]3RE(µ-Cl)Li(THF)3 with the cyclohexyl-linked bis(β-diketimine) H2L (1) (L = Cy[NC(Me)CHC(Me)NAr]2, Cy = cyclohexyl, Ar = 2, 6-i-Pr2C6H3) gave the rare-earth metal amides
合成了一系列由环己基连接的双(β-二酮亚胺基)配体负载的稀土金属酰胺,并开发了它们对醛和酮进行氢膦酰化的催化活性。[(Me 3 Si)2 N] 3 RE(µ-Cl)Li(THF)3与环己基连接的双(β-二酮亚胺)H 2 L(1)(L = Cy [NC(Me)CHC (Me)NAr] 2,Cy =环己基,Ar = 2,6 - i -Pr 2 C 6 H 3)得到稀土金属酰胺LREN(SiMe 3)2(RE = Nd(2),Sm(3),Dy(4),Er(5),Y(6))。所有复合物均通过元素,光谱和单晶X射线分析得到充分表征。配合物的催化性能研究表明,在稀土金属酰胺(0.1-1 mol%)的室温下,负载量非常低的情况下,这些配合物对醛和酮的氢膦酰化反应显示出高催化活性。短时间。