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1992 (1)
1990 (1)
1Author    Dirk Petersen, M. Artina Lemmrich, M. Atthias Altrogge, Jürgen VossRequires cookie*
 Title    Electroreduction o f Organic Com pounds, XV [1] Electrochemical Dehalogenation of Chlorinated Benzenes and Biphenyls in M ethanol  
 Abstract    The twelve possible chlorinated benzenes and the three isomeric m onochlorobiphenyls are elec-trochemically reduced in a divided cell in meth­ anol at a lead cathode. Chlorobenzene and ben­ zene or biphenyl, respectively, are formed with acceptable current yields and very good chemical yields. 
  Reference    Z. Naturforsch. 45b, 1105—1107 (1990); eingegangen am 11. Dezember 1989 
  Published    1990 
  Keywords    Electroreduction, Chlorinated Benzenes and Biphenyls, D ehalogenation 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1105_n.pdf 
 Identifier    ZNB-1990-45b-1105_n 
 Volume    45 
2Author    DavidJ. Brauer, F. Rank, D. Örrenbach, Jörg Fischer, O. Thm, Ar StelzerRequires cookie*
 Title    Synthese von Phosphaalkenclustern durch reduktive Phosphinidenfragmentierung zweizähniger Halogenphosphane R X P -C H 2-P X R mit Fe2(CO) 9 Synthesis of Phosphaalkene Clusters by Reductive Phosphinidene Fragm entation of Bidentate Halogenphosphines R X P -C H 2-P X R with Fe2(CO)9 F rank Bitterer  
 Abstract    Reaction o f halogen functional m ethylenebisphosphines 1 X R P -C H 2-P R X (X = CI, Br) with excess Fe2(CO)9 affords /^-phosphinidene clusters (5) containing phosphaalkene ligands R -P = C H 2. The fragmentation o f the P -C -P skeletons in 1 proceeds stepwise, phosphido complexes 2 and novel Fe3 clusters 3 with R P -C H 2-P R bridging units being formed as inter­ mediates o f the oxidative addition reductive elim ination process. The X-ray structural analysis for 5 b (R = N E t2) reveals an Fe3(C O)9PR butterfly core to which the phosphaalkene ligand R -P = C H 2 (P = C bond length 1.766(4) Ä) is coordinated in a //3,^-m anner. In case o f meth­ ylenebisphosphines 1 with bulky substituents (R = 2,4,6-/Pr3C6H 2) the phosphinidene frag­ mentation o f the P -C -P skeleton is accompanied by the form ation o f 2,3-dihydrobenzo[b]-phosphole ligands. 
  Reference    Z. Naturforsch. 47b, 1529 (1992); eingegangen am 7. Januar 1992 
  Published    1992 
  Keywords    Phosphinidene Fragmentation, Bifunctional Chlorophosphines, D ehalogenation, Phosphaalkenes, Clusters 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1529.pdf 
 Identifier    ZNB-1992-47b-1529 
 Volume    47