Co-ordination behaviour of N-carboxymethylpseudoephedrine: crystal structures of seven-co-ordinated cadmium(II) and fac-RS-octahedral copper(II) complexes
Asymmetric synthesis of new bicyclic phenylboronic esters containing configurationally stable chiral nitrogen and boron
作者:Teresa Mancilla、Rosalinda Contreras
DOI:10.1016/0022-328x(87)85038-6
日期:1987.3
The reaction between phenylboronic acid and N-alkyl-N-(ethyl-2-hydroxy)-aminoacetic acids leads stereoselectively to stable bicyclic esters containing chiral boron and nitrogen atoms.
Trinuclear cobalt(II) and copper(II) complexes of the deprotonated N-[2-hydroxy-1(R)-methyl-2(R)-phenylethyl]-N-methylglycine (R,R(−)(H2cpse)) or N-[2-hydroxy-1(S)-methyl-2(S)-phenylethyl]-N-methylglycine (S,S(+)(H2cpse)) were prepared from the corresponding mononuclear compounds [M(Hcpse)2]·nH2O with the acetyl amino alcohol derivative. The crystal structure of the trinuclear copper(II) [Cu3(R,R(−)cpse)3(H2O)3]·8H2O
MANCILLA T.; CONTRERAS R., J. ORGANOMET. CHEM., 321,(1987) N 2, 191-198
作者:MANCILLA T.、 CONTRERAS R.
DOI:——
日期:——
Co-ordination behaviour of N-carboxymethylpseudoephedrine: crystal structures of seven-co-ordinated cadmium(II) and fac-RS-octahedral copper(II) complexes
作者:Horacio C. López-Sandoval、Noráh Barba-Behrens、Sylvain Bernès、Norberto Farfán-García、Herbert Höpfl
DOI:10.1039/a704485b
日期:——
Co-ordination compounds of N-[2-hydroxy-1(R)-methyl-2(R)-phenylethyl]-N-methylglycine (N-carboxymethylpseudoephedrine, Hcpse) with copper(II), cobalt(II) and cadmium(II) have been prepared and characterised. Crystal structures of copper and cadmium complexes were obtained. In the compound [Cu(cpse)2]·H2O, two cpse are co-ordinated in a tridentate mode giving place to a fac-RS-octahedral geometry. The monomeric compound [Cd(cpse)2(H2O)] has an uncommon seven-co-ordinate geometry with one cpse bonded in a similar arrangement to that of the copper(II) compound, with an oxygen from the carboxylate group in an apical position. The second cpse molecule is co-ordinated with all three atoms in the equatorial plane, the remaining axial position of the distorted pentagonal bipyramid being occupied by a water molecule. As for the latter complex, the metal centre of [Cd(cpse)Cl(H2O)]·H2O·dmso (dmso = dimethyl sulfoxide) presents a distorted pentagonal-bipyramidal geometry where the apical positions are occupied by a water molecule and a chloride ion. The tridentate cpse ligand lies in the equatorial plane and the co-ordination sphere is completed by a chelating carboxylic group from another cpse ligand. Each carboxylate group of cpse is bridging two different cadmium atoms, forming a zigzag chain in a polymeric structure.