Go toArchive
Browse byFacets
Bookbag ( 0 )
'2' in keywords Facet   section ZfN Section B  [X]
Facet   Publication Year 1994  [X]
Results  6 Items
Sorted by   
Publication Year
1994[X]
1Author    Bromo, P. Prillwitz, W. PreetzRequires cookie*
 Title    Darstellung, Schwingungsspektren und Normalkoordinatenanalyse der  
 Abstract    The IR and Raman spectra of the ten brom o-iodo-rhenates(IV) [ReBr"I6_"]2 -, n = 0 -6 , including the geometrical isomers for n -2,3,4, have been recorded at 80 K. The vibrational spectra are com pletely assigned according to point groups O h, D 4h, C4v, C3v, and C2v, as supported by normal coordinate analyses based on a general valence force field. Due to the different mms-influences Br < I in asymmetric axes B r '-R e -I ', the R e -I ' bonds are strengthened and the R e -B r ' bonds are weakened, as indicated by valence force constants, for R e -I ' on average 8,5% higher and for O s -B r ' 8,3% lower, as compared with the values calculated for symmetric I -R e -I and B r -R e -B r axes, respectively 
  Reference    Z. Naturforsch. 49b, 753—7 (1994); eingegangen am 7. März 1994 
  Published    1994 
  Keywords    -Iodo-Rhenate(IV), [ReBr, !^, ]2-, n = 0 -6 Brom o-Iodo-Rhenates(IV ), Stereoisomers, rra/is-Influence, Vibrational Spectra, Normal Coordinate Analysis 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0753.pdf 
 Identifier    ZNB-1994-49b-0753 
 Volume    49 
2Author    MichaelW. Zenke, Karl HensenRequires cookie*
 Title    Phasendiagramme und Exzeßvolumina der Systeme (CH^SiCK/Pvridin und (CH3)2CC12/Pyridin  
 Abstract    The isobaric melting and boiling diagrams for the systems: dimethyldichlorosilane/pyridine and 2,2-dichloropropane/pyridine are reproduced. The existence of the incongruently melting addition compounds (CH3)2SiCl2 (Pyridine)2 and [(CH3)2CC12]3 • Pyridine could be proved. Some measurements of the molar volume of mixtures of pyridine and dimethyldichlorosilane, and pyridine and 2,2-dichloropropane are reported. For both systems the molar excess vol­ ume has been calculated as a function of the mole fractions. 
  Reference    Z. Naturforsch. 49b, 412—416 (1994); eingegangen am 20. September 1993 
  Published    1994 
  Keywords    Phase Diagrams, Pyridine, Dimethyldichlorosilane, 2, 2-Dichloropropane, Excess Volumes 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0412.pdf 
 Identifier    ZNB-1994-49b-0412 
 Volume    49 
3Author    FrankB. Itterer, S. Tefan, K. Ucken, KlausP. Langhans, O. Th, Ar Stelzer, W. S. SheldrickRequires cookie*
 Title    Fragmentierung und Zyklisierung disekundärer Methylenbisphosphane mit sperrigen aromatischen Resten in Fe3-und Ru3-Clustern  
 Abstract    L inear O ligophosphaalkanes, X X V II [1] F rag m en tatio n and Cyclization of D isecondary M ethylenebisphosphanes with Bulky A ro m atic Substituents in F e3 and R u 3 C lusters 
  Reference    Z. Naturforsch. 49b, 1223—1238 (1994); eingegangen am 8. März 1994 
  Published    1994 
  Keywords    D isecondary M ethylenebisphosphanes, Bulky Aromatic Substituents, Phosphinidene Fragmentation, Cyclization, 2, 3-Dihydrobenzo[b]phospholes 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1223.pdf 
 Identifier    ZNB-1994-49b-1223 
 Volume    49 
4Author    Akinori ShiotaniRequires cookie*
 Title    Die Pd-katalysierte oxidative Kupplungsreaktion von Methylbenzoesäuremethylester The Pd-Catalyzed Oxidative Coupling Reaction of Methyl Methylbenzoates  
 Abstract    The Pd-catalyzed oxidative coupling reaction of methyl o-toluate gives, in the presence of a Pd/l,10-phenanthroline(phen)/Cu catalyst, exclusively, the para-linked biphenyldicarboxy-lates 1, 2, and 3. On the other hand, the meta-linked biphenyldicarboxylates 4 and 5, were predominantly formed in a catalyst system of Pd/2,4-pentanedione(acacH)/Cu, and under similar conditions 6 and 7 were also obtained from the coupling reaction of methyl m-toluate and methyl p-toluate, respectively. A reaction scheme has been proposed. 
  Reference    Z. Naturforsch. 49b, 1731—1736 (1994); eingegangen am 21. April 1994 
  Published    1994 
  Keywords    Coupling Reaction, Steric Influence, Palladium, 1, 10-Phenanthroline, 2, 4-Pentanedione 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1731.pdf 
 Identifier    ZNB-1994-49b-1731 
 Volume    49 
5Author    Ulrich Fenner, Hans Pritzkow, W. Alter, Siebert, HerrnRequires cookie*
 Title    Synthese und Komplexierung des 4.5-Cycloocta-2,3-dihydro-l,2,3-trimethyl-l,3-diborols  
 Abstract    Synthesis and Complexation of 4 ,5 -C y c lo o c ta -2 ,3 -d ih y d r o -l,2 ,3 -tr im e th y l-l,3 -d ib o r o le Redox reactions of cyclooctyne and l,l-bis(diiodboryl)ethane lead to 4,5-cycloocta-2,3-dihydro-l,3-diiodo-2-methyl-l,3-diborole (la), which is methylated with AlMe3 to give 4.5-cycloocta-2,3-dihydro-l,2,3-trimethyl-l,3-diborole (lb). Complexation of lb with the complex fragments (C5H5)Co, (C8H12)Ni, (C5H5)Ni, and (OC)3Co leads to the corresponding metal complexes 2 b, 3 b, 4 b, and 5 b. Their constitutions are derived from spectroscopic data and confirmed for 2 b and 4 b by X-ray structure analyses. 2 b contains a C -H -B 3 c /2 e bond, its hydrogen atom could be located. [(C8H12)Ni(lb)] (3 b) is the first example for a (C8H 12)Ni complex having a C -H -B interaction. 2,3-Dihydro-l,3-diborole sind aufgrund ihrer Lewis-Acidität sowie des Donorcharakters der C = C-Doppelbindung hervorragend als Komplex­ liganden geeignet [1]. Dabei fungiert der H etero-cyclus als Vier-und nach Abspaltung des W asser­ stoffatoms an C 2 als D rei-Elektronen-Donor. Eine bifaciale Koordination des 1,3-Diborolyl-Liganden führt zu Zwei-und M ehrkernkomplexen [2, 3] mit Stapelanordnung [4]. Zur Herstellung von 2,3-Dihydro-l,3-diborol-Derivaten haben wir m ehrere Synthesewege entwickelt, wobei Redox-Reaktio-nen zwischen Alkinen und l,l-Bis(diiodboryl)alka-nen die zentrale Rolle bei der Entwicklung dieser Heterocyclen-Chemie spielten. Es zeigte sich, daß der erste Schritt in einer Iodoborierung des Alkins unter Bildung von cis-und frarcs-Addition verläuft. Nur das ds-Produkt ist für die Redox-Reaktion unter Eliminierung von Iod und Bildung einer Bor-Kohlenstoff-Bindung geeignet. Bei Verwendung von Cycloalkinen wie Cyclooctin ist ausschließlich die Bildung von a's-l-Iod-2-boryl-cycloocten zu er­ warten, deshalb sollte die Bildung des Diborols gün­ stig verlaufen. Wir berichten hier über die Synthe­ se des neuen bicyclischen 1,3-Diborols l b und des­ sen Ligandeneigenschaften. * Sonderdruckanforderungen an Prof. Dr. W. Siebert. 
  Reference    Z. Naturforsch. 49b, 315—320 (1994); eingegangen am 15. Oktober 1993 4. 
  Published    1994 
  Keywords    5-Cycloocta-2, 3-dihydro-l, 2, 3-trimethyl-l, 3-diboroles, Cyclopentadienylcobalt, Cyclooctadienenickel, Cyclopentadienylnickel, Tricarbonylcobalt Complexes 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0315.pdf 
 Identifier    ZNB-1994-49b-0315 
 Volume    49 
6Author    M. Sekar, S. Vanitha, K. J. Rajendra, PrasadRequires cookie*
 Title    Synthesis of Novel 3-Acetyl-2-hydroxy-l-N,N-diacetylaminocarbazole Derivatives  
 Abstract    The synthesis of hitherto unknown 3-acetyl-2-hydroxy-l-N,N-diacetylaminocarbazole (3a-f), is reported. The hydroxyiminocarbazoles (2a-f), prepared from 1-oxo-1,2,3,4-tetra-hydrocarbazoles (la -f) on treatment with acetyl chloride in acetic anhydride yielded the title compounds (3a-f). 
  Reference    Z. Naturforsch. 49b, 687—690 (1994); received June 7/August 31 1993 
  Published    1994 
  Keywords    l-Hydroxyimino-l, 2, 3, 4-tetrahydrocarbazoles, 3-Acetyl-2-hydroxy-l-N, N-diacetylaminocar-bazoles, Aromatization, Thermal Fries Rearrangement, Antimicrobial Activities 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0687.pdf 
 Identifier    ZNB-1994-49b-0687 
 Volume    49