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1991 (1)
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1Author    Reiner Luckenbach, Klaus LorenzRequires cookie*
 Title    Das 2-Oxazolinsystem als Schutzgruppe für die sterisch gehinderte Carboxylfunktion bei Grignard-Reaktionen: Synthese phosphororganischer Verbindungen m it einem o-Carboxyphenylrest  
 Abstract    The efficiency of the 2-oxazoline system as a protecting group for the sterically hindered carboxyl function is demonstrated in the case of Grignard-reactions of certain organo­ phosphorus compounds. Thereby, organophosphorus species with an o-carboxyphenyl group are easily accessible. Additionally, the enantiomer separation of an unsymmetrically substituted tertiary phosphine oxide with an o-carboxyphenyl group is described. 
  Reference    (Z. Naturforsch. 32b, 1038—1047 [1977]; eingegangen am 26. April 1977) 
  Published    1977 
  Keywords    2-Oxazoline System, Organophosphorus Compounds, Chiral Phosphine Oxide 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-1038.pdf 
 Identifier    ZNB-1977-32b-1038 
 Volume    32 
2Author    F. I. Abdel-Hay, M. A. Omara, A. A. El-Barbary, M. El-BadawiRequires cookie*
 Title    Organophosphorus Compounds of Expected Biological Activity, Part II* Preparation of Thiourea Derivatives and N-Aryl-phosphorothiomonoamidates  
 Abstract    The examples of cyclodiphosphazanes so far studied do not contain any nuclei of biological interest [1]. In the present investigation we aimed to introduce ethyl p-amino-benzoate, 2-aminopyridine residues in the phosphazane molecule. For this purpose phos-phorus pentachloride was treated with ethyl p-aminobenzoate, p-anisidine, 2-amino-pyridine and 5-aminoquinoline to give l,3-di-j9-ethoxycarbonylphenyl-, l,3-di-j9-methoxy-phenyl-, l,3-di-2-pyridyl-and l,3-di-5-quinolinyl-2,2,2,4,4,4-hexachlorocyclo-diphos-phazane (la-d), respectively. The compounds la-d were treated with potassium thio-cyanate in acetone. The oily products formed were then treated with p-anisidine, ethyl-p-aminobenzoate and 2-aminopyridine whereupon solid products (2a-h) were obtained. The reaction probably takes place according to the following mechanism [2]. la: b: c: d: Ar 1 Ar C2H5OOCC6H4-(p) CH3OC6H4-(p) C5H4N-(2) C9H6N-(5) Ar Cl /N Cl ci >0< ci SCN NCS 2a: b: c: 
  Reference    Z. Naturforsch. 34b, 297—299 (1979); received October 16 1978 
  Published    1979 
  Keywords    Organophosphorus Compounds, Thiourea Derivatives, Biological Activity 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0297.pdf 
 Identifier    ZNB-1979-34b-0297 
 Volume    34 
3Author    Wolfgang KaimRequires cookie*
 Title    Zur Reaktion aromatischer Phosphanderivate mit Elektronen, I. On the Reaction of Aromatic Phosphane Derivatives with Electrons, I  
 Abstract    The compounds ;p-Me2P(X)-CeH4-P(X)Me2, X = O, S, Se, NPh undergo one-electron reduction at a mercury cathode or on reaction with solvated electrons in a K/18-crown-6/THF mixture. The radical anions formed are persistent and have been characterized by ESR. They may be described as complexes of the spin-bearing moiety £>-Me2P-C6H4-PMe2 r with the coordinated groups X. 
  Reference    Z. Naturforsch. 36b, 150—156 (1981); eingegangen am 15. August 1980 
  Published    1981 
  Keywords    Organophosphorus Compounds, Reduction to Radical Anions, ESR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0150.pdf 
 Identifier    ZNB-1981-36b-0150 
 Volume    36 
4Author    A. Ref, A. M. Alya, H. Ubert SchmidbaurRequires cookie*
 Title    Preparation and Properties of ß>-Phosphino-phosphoniocarboxylic Acids and their Betaines  
 Abstract    In an attempt to provide phosphorus analogues o f aminocarboxylic acids and their betaines, a , ft>-bis(diphenylphosphino)alkanes (dppm, dppe, dppp, dppb) were converted into aj-phosphino-phosphoniocarboxylates and diphosphonio-biscarboxylates. While the reac­ tions with haloacetic acids or haloacetates only lead to mcrAj/phosphonium derivatives ow ing to decarboxylation o f the intermediates, /?-chloropropionic acids converts Ph2P(CH2)"PPh2 com pounds into the target products Ph2PCH 2PPh2+(CH2)2CO O H CL (1) and C H 2[PPh2(C H 2)2COOH]22Cl~ (2), for n = 1. For n = 2, 3 and 4, only the analogues o f 2 could be prepared (3 -5). Treatment o f 1 and 2 with sodium bicarbonate afforded the corresponding betaines Ph2PCH 2PPh2+C H 2CH2COO~ (isolated as a dihydrate 6) and C H 2[PPh2+C H 2C H 2COO"]2 (isolated as the tetrahydrate 7). 
  Reference    Z. Naturforsch. 46b, 775—7 (1991); received January 25 1991 
  Published    1991 
  Keywords    co-Phosphino-phosphoniocarboxylic Acids, Phosphobetaines, Organophosphorus Compounds, Organophosphorus Ligands 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0775.pdf 
 Identifier    ZNB-1991-46b-0775 
 Volume    46