Lanthanide anilido complexes: synthesis, characterization, and use as highly efficient catalysts for hydrophosphonylation of aldehydes and unactivated ketones
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
Synthesis and characterization of ytterbium guanidinates stabilized by bridged bis(phenolate) ligand and their application for the hydrophosphonylation reaction of aldehydes
gave the expected ytterbium guanidinato complexes LYb[R2NC(NR1)2] [R1 = Cy, R2N = N(TMS)2 (1), N(CH2)5 (2); R1 = iPr, R2N = N(TMS)2 (3), NPh2 (4)]. These ytterbiumcomplexes were well characterized by elemental analyses, IR spectroscopy and single-crystal X-ray structure determination. The metal ion is six-coordinated by two oxygen and two nitrogen atoms from the bis(phenolate) ligand, and two nitrogen
制备了一系列由胺桥联的双酚盐配体稳定的胍基配合物,并探讨了其对醛的羰基化反应的催化性能。复分解胺桥连的双反应(酚盐)镱氯化物LYbCl(THF)[L =我2 NCH 2 CH 2 N CH 2 - (2-OC 6 H ^ 2吨卜2 -3,5-)} 2 ]与相应的胍基锂在THF中的摩尔比为1:1,得到了预期的胍基络合物LYb [R 2 NC(NR 1)2 ] [R 1 = Cy,R 2 N = N(TMS)2(1),N(CH 2)5(2); R 1 = i Pr,R 2 N = N(TMS)2(3),NPh 2(4)]。这些element配合物通过元素分析,红外光谱和单晶X射线结构测定得到了很好的表征。金属离子由双(酚盐)配体的两个氧和两个氮原子与一个胍基的两个氮原子六配位。around周围的配位几何可描述为扭曲的八面体。已发现这些these胍基络合物是在温和条件下用于各种醛的氢膦酰化反应的高效催化剂。
Copper-Catalyzed Synthesis of α-Hydroxy Phosphonates from<i>H</i>-Phosphonates and Alcohols or Ethers
Easy PC: α‐Hydroxy phosphonates were synthesized by copper/tert‐butyl hydroperoxide (TBHP)‐catalyzed oxidative addition reactions of H‐phosphonates with alcohols or ethers. Diverse α‐hydroxy phosphonates were obtained from substituted benzyl alcohols or alkyl alcohols and alkyl ethers in moderate to good yields.
Unusual Reactivity of Aryl Aldehydes with Triethyl Phosphite and Zinc Bromide: A Facile Preparation of Epoxides, Benzisoxazoles, and α-Hydroxy Phosphonate Esters
作者:Potharaju Raju、Ganesan Gobi Rajeshwaran、Meganathan Nandakumar、Arasambattu K. Mohanakrishnan
DOI:10.1002/ejoc.201500332
日期:2015.6
A facilepreparation of trans-epoxides was achieved by a (EtO)3P–ZnBr2-mediated deoxygenation reaction of the corresponding 2-nitrobenzaldehydes. The sterically hindered analogues of 2-nitrobenzaldehyde underwent a reaction with triethylphosphite in the presence of ZnBr2 as the catalyst to form benzisoxazoles as the sole product. Under identical conditions, the reactions of electron-rich as well as
MgO-coated-Fe3O4 nanoparticles as a magnetically recoverable and reusable catalyst for the synthesis of 1-hydroxyphosphonates
作者:Babak Kaboudin、Foad Kazemi、Fereshteh Habibi
DOI:10.1007/s13738-014-0504-9
日期:2015.3
Nanosize magnetic particles coated with magnesium oxide (core/shell nanoparticles) have been prepared and used for the synthesis of 1-hydroxyalkyl phosphonates. Catalytic activity studies show that the magnetic particles coated with magnesium oxide have highly catalytic activity toward the phosphorylation of aldehydes for the synthesis of 1-hydroxyalkyl phosphonates under solvent-free conditions. Reusability of the prepared magnetic nanoparticles was successfully examined five times with a very slight loss of catalytic activity.