Direct preparation of benzylic manganese reagents from benzyl halides, sulfonates, and phosphates and their reactions: applications in organic synthesis
作者:YoungSung Suh、Jun-sik Lee、Seoung-Hoi Kim、Reuben D Rieke
DOI:10.1016/s0022-328x(03)00500-x
日期:2003.11
The use of highly active manganese (Mn)*, prepared by the Rieke method, was investigated for the direct preparation of benzylic manganese reagents. The oxidative addition of the highly active manganese to benzylic halides was easily completed under mild conditions. Moreover, benzylic manganese sulfonates and phosphates were prepared by direct oxidative addition of Mn* to the carbon–oxygen bonds of
An efficient protocol for the hydrophosphonylation of aromatic and aliphatic aldehydes catalyzed by PS-BEMP under solvent-free conditions (SolFC) has been reported. Addition reactions were performed by using equimolar amounts of reagents and the resulting α-hydroxyphosphonates were isolated with simple workup procedures. A large scale protocol for the preparation of a representative α-hydroxyphosphonate
Coordination properties of diethyl (pyridin-2-ylmethyl)phosphate (2-pmOpe) ligand with perchlorate transition metal salts: Crystal structure of [Co(2-pmOpe)2(H2O)2](ClO4)2
chelate ligands and two coordinated water molecules. Every mononuclear unit is linked to other ones via two extended Co O H⋯O Cl O⋯H O Co bridges, forming one-dimensional (1D) hydrogen bond system. Additionally, weak C H⋯O and π–π interactions link the chains resulting in a three-dimensional (3D) (supramoleculararchitecture) polymeric network arrangement. Spectroscopic and magnetic results are presented
A new ethyl bis(pyridin-2-ylmethyl)phosphate (2-bis(pm)Ope) ligand has been synthesized and used for synthesis of copper(II) and zinc(II) complexes of the formula [MCl2(2-bis(pm)Ope)] [M = Cu(II), Zn(II)]. Despite having the same general formula, Cu(II) and Zn(II) complexes are not isostructural. The Zn(II) complex is four coordinated (MCl2N2) forming probably tetrahedral structure whereas the Cu(II) complex of distorted square pyramidal geometry is five coordinated (MCl2ON2). The later compound not only coordinates by two nitrogen atoms of pyridine rings but also by the oxygen atom of pyridin-2-ylmethoxyl residue. The compound (2-bis(pm) Ope) has been obtained as the product of diethyl (pyridin-2ylmethyl)phosphate's (2-pmOpe) transestrification. The compounds have been identified and characterized by IR, far-IR, H-1 NMR, P-31 NMR and elemental analyses. The crystal structure of copper(II) complex i.e. [CuCl2(2-bis(pm)Ope)] has been determined by the X-ray diffraction method. The low temperature magnetic study reveals significant antiferromagnetic interaction between copper centers through the H-bond system. (C) 2011 Elsevier B. V. All rights reserved.