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'Amino acids' in keywords Facet   section ZfN Section B  [X]
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1Author    Wolfgang Heinzel, Thomas Kronbach, Wolfgang VoelterRequires cookie*
 Title    Klassische Synthese von Thymopoietin 32-36 (TP 5) unter Verwendung der säurelabilen 1-(1 -Adamantyl) -1 -methylethoxycarbonyl-Schutzgruppe + Conventional Synthesis of Thymopoietin 32-36 (TP 5) Using the 1 -(1 -Adamantyl)-1 -methylethoxycarbonyl Group +  
 Abstract    A synthesis of high yields of TP 5 is described. The a-amino functions were blocked by the acid-labile 1-(1 -adamantyl)-l-methylethoxycarbonyl-(Adpoc)group. The Adpoc group is cleaved under mild acidolytic conditions with 3% TFA in CH2CI2 while the £er<-butyl residues remained intact. This selective cleavage of the Adpoc group compared with the Boc and £er£-butyl residues allows new strategies for the synthesis of large peptides. 
  Reference    Z. Naturforsch. 37b, 1652—1658 (1982); eingegangen am 16. September 1982 
  Published    1982 
  Keywords    Adpoc, Amino Acids, Thymopoietin 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1652.pdf 
 Identifier    ZNB-1982-37b-1652 
 Volume    37 
2Author    S.Requires cookie*
 Title    Kinetics and Possible Mechanisms o f the Ce(IY) Oxidation of EDTA, CDTA, DTPA and NTA in Perchloric Acid Media  
 Abstract    a m ir B. H a n n a , W i l l i a m R . C a r r o l l , S a l e m A. A t t i g a , a n d W i l l i a m H . W e b b The rates of oxidation of four chelating agents with Ce(IV) in HC104 solutions, have been studied by the stopped-flow technique. The rates first increase with increasing acidity, reach maxima which are characteristic of the chelating agent and the medium, then progressively decrease with further increasing acid concentration. A t their maximum reactivities, the tendencies for oxidation decrease in the following order: 2rans-l,2-dia-minocyclohexane tetraacetic acid (CDTA) > ethylenedinitrilotetraacetic acid (EDTA) > diethylenetriaminepentaacetic acid (DTPA) > nitrilotriacetic acid (NTA). A mech­ anism for the oxidation of EDTA, involving Ce4+ and Ce(OH)3+ and both unprotonated and monoprotonated chelating agent, is proposed. 
  Reference    (Z. Naturforsch. 30b, 409—415 [1975]; received December 27 1974) 
  Published    1975 
  Keywords    Oxidation, Amino Acids, Kinetics, Mechanisms, Cerium(IY) 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0409.pdf 
 Identifier    ZNB-1975-30b-0409 
 Volume    30 
3Author    H. A. Daboun, A. M. Abd-Elfattah, M. M. Hussein, A.F A ShalabyRequires cookie*
 Title    Reactions of Amino Acids on 2-Methylmercaptohydantoin Derivatives. Synthesis of Imidazoimidazoline and Imidazoquinazoline Derivatives  
 Abstract    Treatment of 5-arylidene-2-methylmercaptohydantoins (la-d) and 
  Reference    Z. Naturforsch. 36b, 366—369 (1981); received October 29 1980 
  Published    1981 
  Keywords    Amino Acids, 2-Methylmercaptohydantoins, Imidazoimidazolines, Imidazoquinazolines 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0366.pdf 
 Identifier    ZNB-1981-36b-0366 
 Volume    36 
4Author    A. Marston, E. HeckerRequires cookie*
 Title    Structure-Activity Relationships of Polyfunctional Diterpenes of the Tigliane Type, V* Preparation and Irritant Activities of Amino Acid and Peptide Esters of Phorbol  
 Abstract    The synthesis of a series of 12-O-amino acyl-and 12-0-peptidyl-13-acetate and -13,20-diacetate esters of the tetracyclic diterpene alcohol phorbol is described. These esters, which include amino acid moieties with both N-protected and free amino functions, were all tested for irritant activity on mouse ear. The highest activities were observed for esters with N-9-fluorenylmethyloxycarbonyl-protected leucine and 11-aminoundecanoic acid. 
  Reference    Z. Naturforsch. 38b, 1015—1021 (1983); received March 28 1983 
  Published    1983 
  Keywords    Amino Acids, Peptides, Phorbol Esters, Irritants, Tumour Promoters 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1015.pdf 
 Identifier    ZNB-1983-38b-1015 
 Volume    38 
5Author    Dirk Steinbom, Olaf Gravenhorst, Henrik Junicke, FrankW. HeinemannRequires cookie*
 Title    Synthese und Charakterisierung von kronenetherstabilisierten Platin(IV)- Komplexen mit Aminosäureliganden Synthesis and Characterization of Amino Acid Complexes of Platinum(IV) Stabilized by Crown Ethers  
 Abstract    Crown ether complexed pentachloro(aqua)platinic acid, (H30)[PtCl5(H20)]-2(18-cr-6) • 6H20 (1) reacts with glycine, L-alanine, and DL-2-aminobutyric acid to give ds-[PtCl4(0-glyH)(H20)](1 8 -cr-6)H 20 (4a)1 and ds-[PtCl4(0-amacH)(H2O)](18-cr-6) (amacH = alaH 4b, abuH 4c), respectively, as well as (amacH2)2[PtCl6]-2(18-cr-6) (amacH = glyH 5a, alaH 5b, abuH 5c). The crown ether complexed hexachloroplatinic acid, (H30) 2[PtCl6]-2(18-cr-6) (2), reacts with glycine to afford (glyH2)[PtCl4(yV,0-gly)]-2(18-cr-6)1.25H20 (6). The structures of 4b and 6 were determined by X-ray diffraction. The alanine ligand in 4b is a zwitterion that is coordinated to platinum by one oxygen atom of the carboxylate group only. The other oxygen atom is engaged in a strong hydrogen bond to the ds-coordinated aqua ligand. The glycinato ligand in 6 is /V,(9-coordinated at platinum forming an anion [PtCl4(/V,0-gly)]_ . The other oxygen atom of the carboxylate group is involved in a strong hydrogen bridge to the cation (glyH2)+. In both complexes hydrogen bridges are formed between the -N+H3 and -NH2 groups of the amino acid ligands and the oxygen atoms of the crown ether molecules. 1 Abbreviations: amacH = amino acid, glyH = glycine, alaH = L-alanine, abuH = DL-2-amino-butyric acid. 
  Reference    Z. Naturforsch. 53b, 581—586 (1998); eingegangen am 16. Januar 1998 
  Published    1998 
  Keywords    Platinum(IV) Complexes, Crown Ethers, Amino Acids, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0581.pdf 
 Identifier    ZNB-1998-53b-0581 
 Volume    53