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'Phosphoranes' in keywords
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1998 (1)
1990 (1)
1979 (1)
1Author    Johannes Breker, Reinhard Schmutzler, BerndD. Orbath, M. Arkus WieberRequires cookie*
 Title    Reaktionen von unsymmetrischen A5P -A 3P-Diphosphorverbindungen und von Diphosphinen (A3P -A 3P) mit ö-Chinonen Reactions of Unsymmetrical /i5P -/ 3P D iphosphorus Compounds and of Diphosphines (>l3P -A 3P) with o-Quinones  
 Abstract    The reaction o f A5P -x 3P diphosphorus com pounds with o-quinones, e.g. tetrachloro-o-benzoquinone or 2,5-di-te/7-butyl-o-benzoquinone, led not only to oxidative addition o f the o-quinone to A3P but also to insertion o f a further molecule o f o-quinone into the P -P bond (i.e. x5P -Ä 3P diphosphorus com pound and o-quinone reacted in a molar ratio 1:2). In the course o f these oxidative addition and insertion reactions the o-quinones were converted into the corresponding hydroquinones (i.e. catechols). The products o f these reactions were charac­ terized by N M R and mass spectrometric methods, and by elemental analysis. The hydrolysis o f the 1:2 addition products proceeded with cleavage o f a P -O -C (hydroquinone) bond and formation o f mononuclear products, involving Ä4P and A5P, respectively. A mechanism o f this hydrolysis is proposed and has been elucidated by independent synthesis o f some products. Diphosphines, i.e. symmetrical A3P -z 3P diphosphorus compounds, were found to react with o-quinones in the same fashion in a molar ratio 1:3, i.e. with oxidative addition o f the o-quinone to both x3P atom s and insertion o f tetrachloro-o-catechol into the P -P bond. 
  Reference    Z. Naturforsch. 45b, 1177—1186 (1990); eingegangen am 13. Oktober 1989 
  Published    1990 
  Keywords    Phosphoranes, Insertion, Oxidative Addition 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1177.pdf 
 Identifier    ZNB-1990-45b-1177 
 Volume    45 
2Author    Gert Bauer, Gerhard HageleRequires cookie*
 Title    Reaktionen polyhalogenierter Cyclobutene mit Trimethylphosphit Reactions of Polyhalogenated Cyclobutenes with Trimethylphosphite  
 Abstract    Structure and reactive behaviour of polyhalogenated cyclobutenes towards trimethyl-phosphite are studied in detail. Stable phosphoranes RP(F)(OCH3)3 as intermediates of Arbuzov-type reactions are obtained. Controlled decomposition of phosphoranes leads to highly reactive c-yclobutenyl substituted phosphonic acid esters RP(0)(0CH3)2. Substitu-tion reactions at aliphatic and vinylic positions of RP(0)(0CH3)2 are observed. Biphos-phonic acid esters R[P(0)(0CH3)2]2 are synthesized. Some routes to perhalogenated cyclo-butenes are described. NMR and MS data for the hitherto unknown cyclobutenyl-sub-stituted organophosphorus compounds are given. 
  Reference    Z. Naturforsch. 34b, 1252—1259 (1979); eingegangen am 3. April/10. Mai 1979 
  Published    1979 
  Keywords    Phosphoranes, Phosphonic Acid Esters, Synthesis, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1252.pdf 
 Identifier    ZNB-1979-34b-1252 
 Volume    34 
3Author    Reint Eujen, Ralf HaigesRequires cookie*
 Title    Reaktionen des donorfreien (C F 3 )2Cd mit Phosphor(V)halogeniden: Difluorcarben-Einschiebungen und Direktsynthese von (C F 3)3PF2 Reactions of Donor-Free (CF3)2Cd with Phosphorus(V) Halides: Insertion of Difluorocarbene and Direct Synthesis of (CF3)3PF2  
 Abstract    Difluorocarbene which is quantitatively eliminated from donor-free bis(trifluoromethyl)-cadmium below 0 °C inserts smoothly into the P-F bonds o f PF5 to form (CF3)3PF2 in high yield. Due to the fast conversion of P-Cl bonds into P-F bonds by cadmium fluoride, PC15 forms (CF3)3PF2 as well, and a direct synthesis of (CF3)3PF2 with ca. 70 % yield starting from CdEt2, CF3I and PC15 is reported. Whereas no insertion o f CF2 into the axial bonds o f (CF3)3PF2 has been detected, reaction o f (CF3)2Cd with (CF3)3PC12 gives the new tetra-kis(haloalkyl)fluorophosphoranes (CF3)3(CF2C1)PF, (CF3)3(CFC12)PF, (CF3) 2 (CF2C1)2PF and (CF3)3(CC13)PF. The NMR spectra of these and related compounds and of their hydrolysis products (CF3)3(CF3_"Cln)PO are reported. The formation of the higher chlorinated phos­ phoranes is discussed in terms o f an isomerization mechanism presumably involving carbene elimination-reinsertion processes. 
  Reference    Z. Naturforsch. 53b, 1455—1460 (1998); eingegangen am 3. Juli 1998 
  Published    1998 
  Keywords    Phosphoranes, Trifluoromethyl Compounds, Difluorocarbene, Cadmium, NM R Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1455.pdf 
 Identifier    ZNB-1998-53b-1455 
 Volume    53