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  • 1
    Electronic Resource
    Electronic Resource
    Metallkomplexe mit biologisch wichtigen Liganden, LXVII[1]. Synthese von α-Aminosäuren aus Palladium(II)- und Rhodium(III)-koordinierten Iminen und Oximen von α-OxocarboxylatenHerrn Professor Dr. Wolfgang Steglich zum 60. Geburtstag gewidmet. (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2421-2427 
    Details
    ISSN: 0009-2940
    Keywords: Palladium complexes ; Rhodium complexes ; α-Amino acids ; 2-Iminocarboxylate as ligand ; Chiral glycine ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal Complexes of Biologically Important Ligands, LXVII[1]. - Synthesis of α-Amino Acids from Palladium(II)- and Rhodium(III)-Coordinated Imines and Oximes of α-OxocarboxylatesThe bis-chelate complexes Pd[O2CC(R1)=NOR2]2 (1) and Pd[O2CC(R1)=NR2]2 (2, R2 optically active substituent) are synthesized by template condensation of an α-oxocarboxylic acid with a hydroxylamine or amine component, respectively. Similarly, the Rh(III) complexes Cp*Rh(Cl)[O2CC(R)=N(CHMePh)] (3a: R = H, 3b: R = Me) were obtained from α-oxocarboxylic acids and optically active 1-phenylethylamine. Catalytic hydrogenation of 1 and 2 gives directly the free α-amino acids with, in case of 2, ee's between 0 and 36%. Nucleophilic attack by the carbanions of RC(O)CH2CO2Et and H2NCH(CO2Et)2 at the imino carbon atom of 3a leads to the α-amino carboxylato complexes 4 and 5. - Compounds 4a and 5 have been characterized by X-ray diffraction. Reaction of 3a with NaBH4 or NaBD4 followed by decomposition of the complex with HCl yields N-substituted glycine and N-substituted α-deuterio-glycine, respectively. The diastereoselectivity (70:30) of the α-deuteration could be determined by NMR spectroscopy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931261113
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrocarbon-Bridged Complexes, XL. Polyene-Bridged Iridium(III), Palladium(II), and Platinum(II) Complexes of Schiff Bases from α,ω-Polyene Dialdehydes and α-Amino Acids or o-AminophenolDedicated to Professor Dieter Seebach on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1467-1473 
    Details
    ISSN: 0009-2940
    Keywords: Schiff bases ; Polyene dialdehydes ; α-Amino acids ; Pantamethylcyclopentadienyl complexes ; P ligands ; Iridium ; Palladium ; Platinum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Schiff bases 1—11 were synthesized from α-amino acids or o-aminophenol and crocetindialdehyde, 2,7-dimethyloctatrienedial, terephthalaldehyde, or β,β′ -p-phenylendiacroleine. The reactions of these Schiff bases with chloro-bridged complexes [(R3P)(Cl)M(η-Cl)]2 (M = Pd, Pt) and [(C5Me5)(Cl)Ir(°Cl)]2 gave the dinuclear complexes 12-31.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971301018
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  • 3
    Electronic Resource
    Electronic Resource
    Metallkomplexe mit biologisch wichtigen Liganden, LXX. Synthese, Stereochemie und Reaktionen von Ruthenium(II) und Osmium(II)-Komplexen mit α-Aminocarboxylat-LigandenHerrn Professor Helmut Werner zum 60. Geburtstag gewidmet. (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 615-620 
    Details
    ISSN: 0009-2940
    Keywords: Ruthenium complexes ; Osmium complex ; Hydrido complexes ; α-Amino acids ; Oxidative Addition ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal Complexes of Biologically Important Ligands, LXX[1].- Synthesis, Stereochemistry and Reactions of Ruthenium(II) and Osmium(II) Complexes with α-Amino CarboxylatesHerrn Professor Helmut Werner zum 60. Geburtstag gewidmet.The reactions of MHCl(CO)(PPh3)3 with salts of α-amino acids give the hydrido-N,O-chelate complexes MH(CO)(NH2CHR-COO)(PPh3)2 (1a-g;) M = Ru, Os). Complexes 1a-c can alternatively be prepared by oxidative addition of the appropriate α-amino acid to Ru(CO)3(PPh3)2. The crystal structure of 1b has been determined by an X-ray structural analysis. The leucinato compound 1c is an effective catalyst for the decomposition of formic acid. In contrast, reactions of RuHCl-(CO)(PPh3)3 with α-amino acids afford the chloro-N,O-che-late complexes RuCl(CO)(NH2CHRCOO)(PPh3)2 2a-h. The decomposition reactions of 2c, 2g and2h have been investigated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270406
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  • 4
    Electronic Resource
    Electronic Resource
    Metallkomplexe mit biologisch wichtigen Liganden, LI. Reaktionen von α-Aminosäuren mit Hexachloropalladat(IV). Stabilisierung von 1-Pyrrolin an Palladium(II) (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1031-1034 
    Details
    ISSN: 0009-2940
    Keywords: Hexachloropalladate(IV) ; α-Amino acids ; 1-Pyrroline and 1-pyrroline-2-carboxylate as ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Complexes of Biologically Important Ligands, LI. - Reactions of α-Amino Acids with Hexachlorpalladate(IV). Stabilization of 1-Pyrroline at Palladium(II)Hexachloropalladate(IV) reacts with an excess of α-amino acids under reduction of the metal to give palladium(II) chelate complexes PdL2 (1) (L = anion of L-Val, L-Leu, L-Phe, L-Glu, L-Gln, DL-indoline-2-carboxylic acid). Chloro-bridged complexes LPd(μ-Cl)2PdL (2) are obtained from [PdCl6]2- and L-Asp, L-Asn, and L-thioproline, respectively. With L-Met, L-Cys, L-LeuOMe, and L-PheOMe Pd(II) complexes 3-5 are also isolated. L-Pro is dehydrogenated and decarboxylated by [PdCl6]2- to yield the Pd(II) complex 6 with 1-pyrroline-2-carboxylate and 1-pyrroline as ligands. L-Cys-Cys and L-Ala yield Pd(IV) complexes 8, 9.
    Notes: Hexachloropalladat(IV) setzt sich mit α-Aminosäuren im Überschuß unter Reduktion des Metalls zu Palladium(II)-Chelatkomplexen PdL2 (1) um (L = Anion von L-Val, L-Leu, L-Phe, L-Glu, L-Gln, DL-Indolin-2-carbonsäure). Chloro-verbrückte Palladium(II)-Komplexe LPd(μ-Cl)2PdL (2) bilden sich bei der Umsetzung von [PdCl6]2- mit L-Asp, L-Asn, und L-Thioprolin. Auch mit L-Met, L-Cys, L-LeuOMe und L-PheOMe werden Palladium(II)-Komplexe (3-5) isoliert. L-Pro wird durch [PdCl6]2- dehydriert bzw. decarboxyliert, wobei der Palladium(II)-Komplex 6 mit 1-Pyrrolin-2-carboxylat und dem in freiem Zustand instabilen 1-Pyrrolin als Liganden erhalten wird. L-Cys-Cys und L-Ala bilden Palladium(IV)-Komplexe (8, 9).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220603
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