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1997 (258)
61Author    Annette Jung, Gotthelf WolmershäuserRequires cookie*
 Title    Bromierung von "Poly(l,4-diselenobenzol)"  
 Abstract    Poly(l,4-diselenobenzene)", obtained by reaction of 1,4-dibromobenzene with disodiumdi-selenide is shown to contain many different polymer sequences. Bromination of the polymer yields a variety of low molecular weight species thus confirming the non-uniformity of the polymer and giving some hints about its composition. The aryl-selenium-bromine compounds 1,4-benzene-diselenenyldibromide, 4,4'-di(bromoselenenyl)-diphenylseleniumdibromide, and bromo-bis(4-bromophenyl)selenonium hexachloroantimonate were fully characterised inclu­ ding X-ray structure determinations. 
  Reference    Z. Naturforsch. 52b, 345—350 (1997); eingegangen am 11. November 1996 
  Published    1997 
  Keywords    Selenium Compounds, Polymers, Crystal Structure " 
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 Identifier    ZNB-1997-52b-0345 
 Volume    52 
62Author    M. Onoheteroarylborates [, Norbert Kuhn3, Heike Kotowski3, Dieter Bläserb, Roland BoesebRequires cookie*
 Title    Monoheteroarylborate [1]  
 Abstract    The heteroaryl borates Li[C4Me4NBH3] (6) and Na[C3H 3N2(BMe3)2]* 2 C4HgO (8) are ob­ tained by treatment of Li[C4Me4N] and Na[C3H3N2] with Me2S • BH3 and BMe3, respectively. The X-ray structure of [Na(C4H 80) 6][C3H 3N 2(BM e3)2] (10) is reported. 
  Reference    Z. Naturforsch. 52b, 351—354 (1997); eingegangen am 28. Oktober 1996 
  Published    1997 
  Keywords    Borates, Pyrroles, Imidazoles, X-Ray 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0351.pdf 
 Identifier    ZNB-1997-52b-0351 
 Volume    52 
63Author    Gerhard Bringmann3, Andreas Wuzika, Olaf Schuppa, Karl Peters13, Eva-Maria PetersbRequires cookie*
 Title    l,3-Di-terf-butyl-6//-benzo[b]naphtho[l,2-d]pyran-6-thione, a Severely Helically Distorted Thionolactone-Bridged Biaryl  
 Abstract    The title compound 2c, a potentially useful synthetic intermediate in stereoselective biaryl synthesis, has been prepared from the oxolactone lc, by treatment with Lawesson's reagent. An X-ray structure analysis reveals its strongly helically distorted structure, the overall molecular distortion even slightly exceeding that of the corresponding oxo compound lc. 
  Reference    Z. Naturforsch. 52b, 355—358 (1997); received October 18 1996 
  Published    1997 
  Keywords    Crystal Structure, Thionolactone, Bridged Biaryl, Biaryl Coupling, Stereochemistry 
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 Identifier    ZNB-1997-52b-0355 
 Volume    52 
64Author    Requires cookie*
 Title    Synthese und Struktur von Kalium-4,4-difluor-[l  
 Abstract    ,3,2]dithiazetidinid-l,l,3?3-tetraoxid und Rubidium-4,4,5,5-tetrafluor-[l,3?2]dithiazolidinid-l,l»3,3-tetraoxid 
  Reference    Z. Naturforsch. 52b, 359 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0359 
 Volume    52 
65Author    Requires cookie*
 Title    Synthese und Kristallstruktur eines Barium-Zink-Vanadyl-phosphats BaZn(V0)(P04)2 mit [(V 0 )P 0 4]-Schichten  
  Reference    Z. Naturforsch. 52b, 367 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0367 
 Volume    52 
66Author    Requires cookie*
 Title    Einkernige und oxoverbrückte zweikernige Fe(III)-Komplexe von N-Alkyl-N,N-bis(2-pyridylmethyl)aminen  
  Reference    Z. Naturforsch. 52b, 372 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0372 
 Volume    52 
67Author    M.Elena Olmos, Annette Schier, Hubert SchmidbaurRequires cookie*
 Title    Diphenyl(l-pyridyl)phosphine Sulfide as a Ligand in Mono-and Binuclear Coinage Metal Complexes  
 Abstract    A norganisch-chem isches Institut der Technischen U niversität M ünchen, L ichtenbergstrasse 4, D -85748 G arching, G erm any Z. N aturforsch. 52 b, 3 8 5 -3 9 0 (1997); received January 17, 1997 C opper(I), Silver(I), G old(I) C oordination, D ip h en y l(l-p y rid y l)p h o sp h in e Sulfide, A m bidentate Ligand D ip h enyl(l-pyridyl)p h o sp h in e sulfide, Ph2pyPS, 1, gives a 1:1 com plex (2) w ith A uC l upon treatm ent with (C4H sS)A uCl. A ccording to an X -ray diffraction analysis, this co m ­ pound is isom orphous w ith the Ph^PS com plex. [Ph3PA u]BF4 and 1 give the cationic com plex [Ph;?PAuSPpyPh2]BF4 (3) . W ith tw o equivalents o f the sam e reagent the binuclear com plex 4 is generated, in w hich the metal atom s are S-and N -bonded. T he reaction o f 2 equivalents o f 1 w ith [(tetrahydrothiophene)2A u]C 104 affords the 2:1 com plex 5 w ith the gold atom exclusively S-bonded. The analogous reaction with A gB F4 gives the 2:1 com plex 6, the structure o f w hich has also been determ ined by X -ray diffraction. T he silver atom is engaged in coordinative bonding w ith both sulfur and both nitrogen atom s in a quasi-tetrahedral environm ent. A ddition o f A gC 104 to com pound 5, and o f [(M eC N)4C u]B F 4 to 6, gives m ixed-m etal com plexes (7, 8) w ith head-to-head structures, the silver atom s being exclusively S-bonded. 
  Reference    Z. Naturforsch. 52b, 385 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0385 
 Volume    52 
68Author    Requires cookie*
 Title    Röntgenstrukturuntersuchungen an Elpasolith-verwandten Hexacyanokomplexen [N(CH3)4]2A[M(CN)6] (A = Rb, TI; M = Cr, Fe)  
  Reference    Z. Naturforsch. 52b, 391 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0391 
 Volume    52 
69Author    S.Requires cookie*
 Title    Synthese und Kristallstruktur von Hexa(ter/-butyl)bism ocenium - tetrachloroaluminat  
 Abstract    y n th e s is a n d C ry s ta l S tr u c tu r e o f H e x a (r m -b u ty l) b is m o c e n iu r n T e tr a c h lo r o a lu m in a te 
  Reference    Z. Naturforsch. 52b, 398 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0398 
 Volume    52 
70Author    Requires cookie*
 Title    Uber die Reaktionen von (CH3)4N+I-, (CH3)4N+IC12-, (CH3)4N+IC14- und (CH3)4N+C1~ mit Trifluormethylhypochlorit CF3OCl  
  Reference    Z. Naturforsch. 52b, 401 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0401 
 Volume    52 
71Author    Requires cookie*
 Title    Hydrothermal Synthesis and Crystal Structure of the New Manganese(II) Thioantimonate(III), Mn(en)3Sb4S7  
  Reference    Z. Naturforsch. 52b, 405 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0405 
 Volume    52 
72Author    Requires cookie*
 Title    Bondenolide, a New Diterpenoid from the Seeds of Caesalpinia bonduc  
 Abstract    V iq a r U d d in A h m a d * 3, M u m a m m a d S h a iq A lia, K . U s m a n g h a n ib a H. E. J. R esearch Institute of Chem istry. U niversity o f K arachi. K arachi-75270, Pakistan b D ep artm en t of Pharm acognosy, Faculty of Pharm acy, U niversity o f K arachi, K arachi-75270, Pakistan Z. N aturforsch. 52b, 4 1 0 -4 1 2 (1997); received D ecem b er 6, 1996 B ondenolide, D iterpenoid, Seeds, Caesalpinia bonduc, C aesalpiniaceae A new diterp en o id nam ed as bondenolide (1) was isolated from the ethyl acetate soluble p art of the m ethanolic extract of Caesalpinia bonduc (seeds). In addition to 1, four known triterpenoids: a-am yrin [12-ursen-3/?-ol], /?-amyrin [12-oleanen-3/3-ol], lup-20(29)-en-3/?-ol, lup-20(29)-en-3/?-yl acetate and two know n sterols: ^-sito stero l [24(R)-stigmast-5-en-3/3-ol] and /S-sitosteryl galactoside [3-0-/3-D -galactopyranosyl-stigm asta-5-enen] were also isolated from the sam e source. 
  Reference    Z. Naturforsch. 52b, 410 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0410 
 Volume    52 
73Author    Requires cookie*
 Title    Enzymatic Racemic Resolution of a Fluorinated Substrate and Syntheses of E and Z Alkenes as Precursors for Some Biologically Active Fluorohexoses  
  Reference    Z. Naturforsch. 52b, 413 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0413 
 Volume    52 
74Author    M. U. StafaRequires cookie*
 Title    Synthesis and Chiroptical Properties of Some N-(2-Chloro-7-cyclopropyl- 4,7-dihydro-4-oxo-thieno[2,3-b]pyridine-5-carbonyl) L -a-Amino Esters  
 Abstract    -A b a d e la h 3 *, M u sa Z . N a z e r3, Salim S. S a b ri3, Salim M. K h alil3, W olfgang V o e lte r * b, M a rc ela G e ig e rb 4-Thieno[2,3b]pyridones, Circular Dichroism, Antibacterials A series of N-(2-chloro-7-cyclopropyl-4,7-dihydro-4-oxothieno[2,3-b]pyridine-5-carbonyl)-L-a-amino esters (5) have been prepared via the respective thieno[2,3-b]pyridinyl-5-carbonyl chloride (4). The CD spectra of the L-aliphatic (5 a -d) and L-aromatic (5e -g) a-am ino acid derivatives display, in organic solvents, sign inversion of the measured Cotton effect (CE) bands. This chiroptical behaviour is probably associated with differences in conformational isomerism of either set. MS and NM R spectral data of the title compounds are presented. 
  Reference    Z. Naturforsch. 52b, 419—426 (1997); received November 5 1996 
  Published    1997 
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 Identifier    ZNB-1997-52b-0419 
 Volume    52 
75Author    LuRequires cookie*
 Title    Synthesis of N,C,C-Trilithio-2,5-diaIlyl- pyrrole and its Solvent-Controlled Reactions with Electrophiles  
 Abstract    te d so lu tio n s ca n b e co o led to -80 °C w ith o u t p rec ip ita tio n . B e rn d W ra c k m e y e r5 5 B e rn d Schw arze Iris O rd u n g , 2,5-Diallylpyrrole 1 reacts with an excess of "BuLi in hexane/diethylether to give the N,C,C-trilithio reagent 2. 7Li NMR spectra of 2 in THF/ HMPTA at low tem perature indicate the pres­ ence of an ionic species. Reactions of 2 in TH F with electrophiles such as H 20 , D20 , Mel, Me3SiCl and Me3SnCl lead selectively to the cis-isomers 3a -6 a, whereas the analogous reactions in hexane or diethylether afford mixtures contain­ ing both cis-and rram-isomers (e.g. 3b). 
  Reference    Z. Naturforsch. 52b, 427—430 (1997); received November 5 1996 
  Published    1997 
  Keywords    Pyrrole, Solvent Controlled Reactions, NMR Spectra 
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 Identifier    ZNB-1997-52b-0427_n 
 Volume    52 
76Author    Z. NaturforschRequires cookie*
 Title    A N ew Lithium Am ide with Bulky Substituents -Molecular Structure o f N-Lithio-N-trimethyIsilyl-9  
 Abstract    amino-9-borabicyclo[3.3.1]nonane; Com petition between N-Li and BN(pp);r Interactions B e rn d W ra c k m e y e r* , B e rn d S chw arze, J ü rg e n W e id in g e r, W olfgang M ilius Am inoborane, X-Ray, Lithium Amide N-Lithio-N-trimethylsilyl-9-amino-9-borabicy-clo[3.3.1]nonane (2) was prepared from the reac­ tion of N-trimethylsilyl-9-amino-9-borabicyclo-[3.3.1]nonane (1) with rer/-butyl lithium; 2 crystal­ lizes as a trim er with a planar N3Li3 ring. The ni­ trogen atoms are tetrahedrally coordinated, but should be treated as sp2 hybridised, because the BN double bond, typical of aminoboranes, is retained. 
  Reference    Z. Naturforsch. 52b, 431—433 (1997); received November 28 1996 
  Published    1997 
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 Identifier    ZNB-1997-52b-0431_n 
 Volume    52 
77Author    H.-H Drews, W. PreetzRequires cookie*
 Title    Berechnung der 19F-und 195 Pt-NMR-Verschiebungen von FIuoro-Chloro-Bromo-Platinaten(IV) C alculation o f 19F and 195Pt N M R Shifts o f Fluoro-C hloro-B rom o-Platinates(IV )  
 Abstract    Fluoro-Chloro-Bromo-Platinates(IV), Calculation of l9F and l95Pt NMR Shifts, trans and cis Influence By reaction o f [PtBr4]2~ with XeF2 in dichloromethane product mixtures containing nine fluoro-chloro-, four fluoro-bromo-and 15 fluoro-chloro-bromo-platinates(IV) are formed. All complexes are detectable by in situ l9F NMR measurements. Due to the increasing trans influence F < Cl < Br, the signals <5(I9F) of symmetric F-Pt-F axes observed at highest field are shifted downfield on the average by 93 ppm as compared with <5(19F*) of F*-Pt-Cl' axes, and further to lower field by 40 ppm for 6(F**) of F**-Pt-Br" axes. For the same reason the coupling constant '/(F**Pt) « 1099 Hz is by 13.3 % smaller than './(F*Pt) « 1268 Hz, which is by 32.3 % smaller than '7(FPt) « 1873 Hz. Based on the axis method, and taking into account characteristic increments of chemical shifts depending on cis influences, the calculation of the l95Pt NMR signals of 27 observed species of the system [PtF"Cl6_"_wBr/"]2_ n, m = 0 -6 , has been successful. The l95Pt NMR shifts of further 29 so far not detected complexes are predicted. Using parameters depending on the geometry of the complex, the l9F NMR shifts of 28 F-containing platinates(IV) have been calculated in good agreement with the experimental data. I9F resonances are predicted for 19 so far missing complexes. 
  Reference    Z. Naturforsch. 52b, 435—442 (1997); eingegangen am 30. Januar 1997 
  Published    1997 
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 Identifier    ZNB-1997-52b-0435 
 Volume    52 
78Author    B. Steuer, H. Thomsen, W. PreetzRequires cookie*
 Title    fl^-m/rio-Rechnungen, Schwingungsspektren und Normalkoordinaten- analyse von c/050-[B6H5F]2' ab initio Calculations, Vibrational Spectra, and Normal Coordinate Analysis o f c/<m>-[B6H5F]2~  
 Abstract    Fluoro-pentahydro-c/aw-hexaborate(2-), ab initio Studies, Vibrational Spectra, Normal Coor­ dinate Analysis The structural parameters of c/oso-[B6H5F]2-with C4v symmetry have been determined by MP2/6-31G* optimization. They reveal typical B-F and B-B bond lenghts of 143.4 and 172.5 -173.9 pm, respectively. A frequency analysis at the same theoretical level has been performed. The vibrational spectra of [B6H5F]2~ labelled with l0B, n B and D have been additionally assigned by normal coordinate analysis based on a modified valence force field using the ab initio structure parameters. With a set of 10 force constants (e.g. fd(BB)=1.92, fd(BF)=5.25 mdyn/A) a good agreement between observed and calculated frequencies can be achieved. The results correspond with the scaled (FscaU.=0.97) ab initio frequencies and assignments. 
  Reference    Z. Naturforsch. 52b, 443—448 (1997); eingegangen am 10. Januar 1997 
  Published    1997 
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 Identifier    ZNB-1997-52b-0443 
 Volume    52 
79Author    J.-P Werner, Hk Müller-BuschbaumRequires cookie*
 Title    Elektroneutrale Pb40 4 -Heterokubaneinheiten in den Aluminatsodalithen Ln4[Al12024](Pb404)2 (Ln = Nd, Sm) Electrically Neutral Pb40 4 Heterocubane Units in Aluminate Sodalites Ln4[A l,2 0 24](Pb4 0 4 )2 (Ln = Nd, Sm)  
 Abstract    Single crystals of Ln4[A lI20 24](Pb40 4)2 (Ln = Nd, Sm) have been prepared by flux techni­ ques. The compounds crystallize with cubic symmetry, space group Oh-Pn3m, a ^ = 9.514(1), asm = 9.481(1) A, Z = 1. The crystal structure is characterized by a [A1120 24] U~ framework. Four of the eight six-membered rings of A104-tetrahedra per sodalite cage are centered by Ln3+ ions. The cages of the resulting electrically neutral network are filled with [Pb40 4]±) heterocubane units. Oxygen of the heterocubane units completes the coordination spheres of the rare earth ions to hexagonal bipyramids. 
  Reference    Z. Naturforsch. 52b, 449—452 (1997); eingegangen am 17. Januar 1997 
  Published    1997 
  Keywords    Lead, Rare Earth, Aluminate Sodalite, Crystal Structure 
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 Identifier    ZNB-1997-52b-0449 
 Volume    52 
80Author    B. Mertens, Hk Müller-BuschbaumRequires cookie*
 Title    Synthese und Röntgen-Strukturuntersuchung von  
 Abstract    Rb4Cd(V0)(V2 0 7)2Cl und Tl4C d(V0)(V20 7)2Cl Synthesis and X-Ray Structure Analysis o f Rb4C d (V 0)(V 20 7)2Cl and Tl4C d(V 0)(V 20 7)2Cl Single crystals of (I) Rb4Cd(V0)(V20 7)2Cl and (II) Tl4C d(V 0)(V 20 7)2Cl have been prepared by flux techniques. The compounds were examined by X-ray analysis. They crystallize with tetragonal symmetry, space group C{-P4 with (I): a = 9 .142(1); c = 5.525(1), (II): a = 9.150(1), c = 5.405(1) A, Z = 4. Both compound belong to the K4CuV50 | 5Cl-Type. V (l) forms V20 7 double tetrahedra, connected by square V (2)0 5 pyramids and C d 0 4Cl2 octahedra. The short V (2)-0 distance indicates a vanadyl group. 
  Reference    Z. Naturforsch. 52b, 453—456 (1997); eingegangen am 27. Januar 1997 
  Published    1997 
  Keywords    Rubidium, Thallium, Vanadium Oxide-Chloride, Crystal Structure 
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 Identifier    ZNB-1997-52b-0453 
 Volume    52 
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