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Facet   Publication Year 1980  [X]
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1980[X]
81Author    Gerd MeyerRequires cookie*
 Title    Halogen-Elpasolithe, VI [1] Erste Iod-Elpasolithe, Cs^M™^ (B 1 = Li, Na) Halo-Elpasolites, VI [1] The First Iodo-Elpasolites, Cs2B I M III I6 (Bi=Li, Na)  
 Abstract    Some iodo elpasolites Cs2LiM m I6 (M 111 = Sc, Lu, Tm, Ho) and Cs2NaM I i I I6 (M»i = Sc, Lu, Tm, Er) have been prepared for the first time. According to Guinier-Simon X-ray powder photographs they belong to the elpasolite type structure (cubic K2NaAlF6-type and its tetra-gonal distorted variety: Cs2NaMIe) or to the Cs2LiGaF6-type structure (trigonal: Cs2LiMIe). The compounds Cs2LiTmX6 (X = CI, Br, I) are further characterized by Raman spectra and magnetic susceptibilities. 
  Reference    Z. Naturforsch. 35b, 394—396 (1980); eingegangen am 28. November 1979 
  Published    1980 
  Keywords    Iodides, Elpasolites, Rare Earths 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0394_n.pdf 
 Identifier    ZNB-1980-35b-0394_n 
 Volume    35 
82Author    Jürgen Evers, Gilbert Oehlinger, Armin WeissRequires cookie*
 Title    Einkristalldaten der Hochdruck- Hochtemperaturphase von BaGe2 Structural Refinement of the High Pressure - High Temperature Phase of BaGe2  
 Abstract    A single crystal investigation of the high pressure -high temperature phase of BaGe2 (a-ThSi2 type of structure) has been performed. Space group I4i/amd has been derived from rotation, Weissenberg and precession photo-graphs. On a four-circle-diffractometer 1082 reflections with 0 < Ä < 8, 0 < fc < 8, 24 < Z < 24 have been measured with filtered Mo-radiation. This results in 296 independent reflections. Data of the complete structural analysis are sum-marized in Tabs. I and II. The final i?-values are = 6.09%, = 4.19%, 7?g = 4.95%. 
  Reference    Z. Naturforsch. 35b, 397—398 (1980); eingegangen am 21. November 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0397_n 
 Volume    35 
83Author    G. Rettig, H. P. LatschaRequires cookie*
 Title    Die Reaktion von Antimon(V)-chlorid mit p-Benzoehinon The Reaction of Antimony(V) Chloride with p-Benzoquinone  
 Abstract    2>-Benzoquinone, Antimony(V) Chloride The reaction of p-benzoquinone with an excess of SbCls gives 2,3,5,6 -tetrachloro -p -benzoquinone ("Chloranil") in high purity and almost quantitative yield. 2,6-and 2,5-dichloro-p-benzoquinone could be identified as inter-mediate products. 
  Reference    Z. Naturforsch. 35b, 399—400 (1980); eingegangen am 5. Dezember 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0399_n.pdf 
 Identifier    ZNB-1980-35b-0399_n 
 Volume    35 
84Author    R. Battaglia, P. Mastropasqua, H. KischRequires cookie*
 Title    Übergangsmetallkomplexe von Diazenen, XIV [1] Photochemische Darstellung und Reaktionen von (^ 1 -2.3-Diazanorbornen)Fe2(7y 5 -C5H5)2(CO)s Transition Metal Complexes of Diazenes, XIV [1] Photochemical Synthesis and Reactions of (^ 1 -2,3-Diazanorbornene)Fe2(^ 5 -C5H5)2(CO)3  
 Abstract    Diazene Complexes Irradiation of (^ 5 -C5H5)2Fe2(CO)4 in the pres-ence of 2,3-diazanorbornene affords (^ 1 -2,3-diazanorbornene)-Fe2(?? 5 -C5H5)2(CO)3 (1) and small amounts of (^ 2 -2,3-diazanorbornene)Fe2-(7? 5 -C5H5)2(CO)2 (2). 1 is converted into 2 upon heating but not upon photolysis. 
  Reference    Z. Naturforsch. 35b, 401—402 (1980); eingegangen am 18. Dezember 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0401_n.pdf 
 Identifier    ZNB-1980-35b-0401_n 
 Volume    35 
85Author    Dieter Brodalla, Rüdiger KniepRequires cookie*
 Title    (H30)[A13(H2P04)6(HP04)2] * 4 H20 - ein Al-O-P vernetztes Phosphat mit Oxoniumionen enthaltenden Hohlräumen (H30)[Al3(H2P04)6(HP04)2] * 4 H20 - a <g Al-O-P Linked Phosphate with Hollows Containing Oxonium Ions  
 Abstract    The crystal structure of (H30)[Al3(H2P04)6(HP04)2] • 4 H20 contains layers consisting of AIOÖ octahedra which share vertices with 02P(0H)2 and 03P(0H) tetra-hedra. Within these layers there are vacancies (hollows) which are occupied by H30+ species. Water molecules are fixed between neigh-bouring layers by hydrogen bonds. The identity of some other related phosphates is discussed with respect to the crystal structure described in this paper. 
  Reference    Z. Naturforsch. 35b, 403—404 (1980); eingegangen am 23. Oktober 1979 
  Published    1980 
  Keywords    Acid Aluminium Phosphates, Oxonium Ion, Crystal Structure 
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 Identifier    ZNB-1980-35b-0403_n 
 Volume    35 
86Author    Michael DavisRequires cookie*
 Title    A Comment on the Paper "Benzo-U 4 , 2-thiazol, a New Bicyclic lOjr-System"  
 Abstract    Heterocycle, 2,1-Benzisothiazole The "novel 107i-system" reported earlier is a 2,1-benzisothiazole, a well-known heterocyclic system. 
  Reference    Z. Naturforsch. 35b, 405 (1980); received September 3 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0405_n.pdf 
 Identifier    ZNB-1980-35b-0405_n 
 Volume    35 
87Author    B. Thiele, W. Grunwald, D. Rink, BreitingerRequires cookie*
 Title     
 Abstract    Beim Druck wurden die Verbindungslinien in Tab. V weggelassen; die vervollständigte Tab. V sieht folgendermaßen aus: Tab. V. Korrelationsdiagramm für MT1C14 (M = K, Rb, TI)*. Raumgruppe I 4i/a-CV Z = 4, Z' = 2 (primitive Zelle). 
  Reference    Z. Naturforsch. 35b, 406 (1980) 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0406_e.pdf 
 Identifier    ZNB-1980-35b-0406_e 
 Volume    35 
88Author    K. Barlos, H. NöthRequires cookie*
 Title    Beiträge zur Chemie des Bors, CIX [1] Neue Fünfringheterocyclen des Bors: Triazaborolidine mit Silicium, Phosphor uud Arsen als Ringglieder Contribution to the Chemistry of Boron, CIX [1] New Five-Membered Heterocycles of Boron: Triazaborolidines Containing Silicon, Phosphorus and Arsenic as Ring Atoms  
 Abstract    l,2,4-Triaza-3-sila-5-borolidines, l,2,4-Triaza-3-phospha-5-borolidines, l,2,4-Triaza-3-arsa-5-borolidines, NMR Spectra l,2,4-Triaza-3-sila-5-borolidines (1) are accessible via N,N'-dilithio-N,N'-dimethyl-hydrazine and Br(CH3)B-NCH3-Si(CH3)2Br or by transsilylation of the permethyl derivative of 1. Similarly, phosphorus halides replace the (CH^Si group of heptamethyl-triaza-3-sila-5-borolidine (2), affording triaza-3-phospha-5-borolidines, while ASCI3 yields 3-chloro-l,2,4,5-tetrametbyl-l,2,4-triaza-3-arsa-5-borolidine. Nucleophilicreplacements at the P atom of 3-chloro-triaza-3-phospha-5-borolidine (9) are readily achieved. Surprisingly, the various substituents at the P atom of the new heterocyclic systems have little in-fluence on <5 n B, in contrast to 6 1 !!. This is attributed to n-and cr-effects. It is assumed that the new ring systems are nonplanar. 
  Reference    Z. Naturforsch. 35b, 407—414 (1980); eingegangen am 30. November 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0407 
 Volume    35 
89Author    Kleomenis Barlos, Heinrich NöthRequires cookie*
 Title    Beiträge zur Chemie des Bors, CX [1] Synthese und Reaktionen von Sila-und Phosphaborazinen Contributions to the Chemistry of Boron, CX [1] Synthesis and Reactions of Sila-and Phosphaborazines  
 Abstract    Silaborazines, A 3 -Phosphaborazines, A 5 -Phosphaborazines, NMR Spectra The synthesis of permethylated silaborazines starting from Br(CH3)B-NCH3-Si(CH3)2Br or Br(CH3)B-NSi(CH3)3-Si(CH3)2Br is described. These may in turn be used to prepare phosphaborazines, since phosphorus halides replace selectively the sila group from the silaborazines. The P-Cl bond of P-chloro-pentamethylphosphaborazine is more reactive than the P-N and B-N bonds of the ring and allows selective nucleophilic substitution reactions at phosphorus. The NMR data of the new compounds suggest a nonplanar ring-configuration. Silaborazine 
  Reference    Z. Naturforsch. 35b, 415—420 (1980); eingegangen am 14. Dezember 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0415.pdf 
 Identifier    ZNB-1980-35b-0415 
 Volume    35 
90Author    Udo Kunze, S.Budhi SastrawanRequires cookie*
 Title    Reaktivität metallorganischer Komplexe mit Zinn-Metall-Bindung, IV [1] S02 -Insertion an phosphinsubstituierten und anionischen Triorganozinn-Komplexen des Chroms, Molybdäns und Wolframs Reactivity of Organometallic Complexes Containing Tin-Metal Bonds, IV [1] SO2 Insertion into Phosphine Substituted and Anionic Triorganotin Complexes of Chromium, Molybdenum and Tungsten  
 Abstract    The trans phosphane and phosphite substituted organotin complexes of molybdenum 1-4 are prepared by thermolysis or photolysis of the tricarbonyl parent compounds. The phosphane complexes 1 and 2 react readily with liquid sulfur dioxide by absorption of 1-3 moles of SO2 depending on temperature. IR and NMR spectra indicate cleavage of tin-carbon bonds only yielding insertion products of the sulfinato-0 type la-c and 2a-c. The phosphite complexes 3, 4 are less reactive and yield a di-insertion 3 a and a mono-insertion compound 4 a. The anionic triphenyltin derivatives of chromium, molybdenum and tungsten 5-7 undergo facile cleavage of 1 (Cr) or 3 (Mo, W) tin-phenyl bonds. The course of SO2 insertion into 1-7 reveals a distinct activation of the Sn-C bond in organotin transition metal complexes by substitution with stronger donor molecules or reduction to anionic species. 
  Reference    Z. Naturforsch. 35b, 421—427 (1980); eingegangen am 14. November/28. Dezember 1979 
  Published    1980 
  Keywords    S02-Insertion, Organotin Complexes, Phosphane Ligand, Phosphite Ligand, Anionic Complexes 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0421.pdf 
 Identifier    ZNB-1980-35b-0421 
 Volume    35 
91Author    Joseph Grobe, Michael Keil, Bernd Schneider, Heinz ZimmermannRequires cookie*
 Title    Elektrochemische Synthesen, II [1] Theoretische Aspekte der elektrochemischen Synthese von Komplexen Electrochemical Syntheses, II [1] Theoretical Aspects of the Electrochemical Synthesis of Complexes  
 Abstract    A theoretical model for the electrochemical synthesis of transition metal complexes in low oxidation states has been developed on the basis of Pearson's HSAB concept. A MO description is used to discuss the important practical implications of the model. 
  Reference    Z. Naturforsch. 35b, 428—432 (1980); eingegangen am 17. Dezember 1979 
  Published    1980 
  Keywords    Electrochemical Synthesis, Metal Complexes, Low Oxidation States 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0428.pdf 
 Identifier    ZNB-1980-35b-0428 
 Volume    35 
92Author    JohannW. Buchler, Kiong-Lam Lay, Harald StoppaRequires cookie*
 Title    Metallkomplexe mit Tetrapyrrol-Liganden, XXIV [1] Zur Kenntnis der Platin(IV)-Porphyrine Metal Complexes with Tetrapyrrole Ligands, XXIV [1] On the Knowledge of Platinum(IV) Porphyrins  
 Abstract    The first platinum(IV) porphyrin, dichloromeso-tetra(jo-tolyl)porphinatoplatinum(IV) [Pt(TPP)Cl2**], is prepared by oxidation of the corresponding platinum(II) complex [Pt(TTP)**] with hydrogen peroxide in acidic media and treatment with hydrogen chloride. Pt(TTP)Cl2 is thermally stable up to 200 °C. Electrochemical reduction yields Pt(TTP), presumably by a two-electron step. The platinum-to-porphyrin jr-backbonding known to exist in Pt(TTP) decreases on oxidation to Pt(TTP)Cl2 but does not vanish. An improved synthesis of Pt(TTP) is described. Evidence for the accessibility of Pt(OEP)Cl2 and Pd(TTP)Cl2 is also presented. 
  Reference    Z. Naturforsch. 35b, 433—438 (1980); eingegangen am 7. Januar 1980 
  Published    1980 
  Keywords    Platinum Porphyrins, Palladium Porphyrins, Electronic Absorption Spectra, Electrochemistry of Metalloporphyrins 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0433.pdf 
 Identifier    ZNB-1980-35b-0433 
 Volume    35 
93Author    Bernd WrackmeyerRequires cookie*
 Title    Vergleich zwischen n B-und 13 C-chemischen Verschiebungen dreifach koordinierter Borverbindungen und Carbenium-Ionen Comparison between n B and 13 C Chemical Shifts of Three-Coordinate Boron Compounds and Carbenium Ions  
 Abstract    The relationship between U B chemical shifts (<5 n B) of trigonal boranes and 13 C® chemical shifts (<5 13 C®) of carbenium ions was found to be more complex than previously reported. The trends observed allow for the comparison of (pp) n bonding between boron and suitable substituents with the TT-charge derealization in carbenium ions. In case of the ferrocenyl boranes and ferrocenyl carbenium ions the markedly different trend in the shielding of 11 B and 13 C® favours a fulvene-like structure for the substituted cyclopenta-dienyl ring in the latter. Structural features are analogously reflected by <5 U B and d 13 C® data for both series of compounds. Comparison of <5 13 C data of organoboranes and carbe-nium ions can be useful in conformational studies. Einführung 
  Reference    Z. Naturforsch. 35b, 439—446 (1980); eingegangen am 5. November/14. Dezember 1979 
  Published    1980 
  Keywords    Boranes, Carbenium Ions, 13 C NMR Spectra, U B NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0439.pdf 
 Identifier    ZNB-1980-35b-0439 
 Volume    35 
94Author    Heinz-Gerhard Köhn, Anton MelierRequires cookie*
 Title    Zur Chemie des l-Aza-2-bora-3-oxacyclopentansystems The Chemistry of the l-Aza-2-bora-3-oxacyclopentane System  
  Reference    Z. Naturforsch. 35b, 447—453 (1980); eingegangen am 15. Oktober/10. Dezember 1979 
  Published    1980 
  Keywords    l-Aza-2-bora-oxacyclopentanes, Dimers and Trimers, B-Silylamino Derivatives, Bis(trimethylsilyl)ethanolamines 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0447.pdf 
 Identifier    ZNB-1980-35b-0447 
 Volume    35 
95Author    Georg Süß-FinkRequires cookie*
 Title    N-H-Aktivierung an Os3 -Clustern  
 Abstract    Darstellung und Charakterisierung von Os3(CO)n(NH3), Os3(CO)n(NHC6H10) und OS3(CO)10(/,-H)(/,-NC6H10) N-H Activation on 0s3 Clusters. Preparation and Characterization of Os3(CO)n(NH3), Os3(CO)n(NHC6Hi0) and Os3(CO)io(^-H)(/a-NC6Hio) The ammonia complex Os3(CO)N(NH3) was prepared by aminoxide induced carbonyl substitution of Os3(CO)I2. Upon heating one hydrogen atom in Os3(CO)N(NH3) is trans-ferred onto the metal frame to yield the complex OS3(CO)IO(JU-H)(/^-NH2). Reaction of OS3(CO)H(NH3) with cyclohexanone affords the ketimine complex Ös3(CO)N(NHC6HIO), which can be transformed thermally into Os3(CO)io(/I-H)(i«-NC6Hio). The N-H bond of the ketimine ligand is activated under milder conditions than that of the ammonia ligand. 
  Reference    Z. Naturforsch. 35b, 454—457 (1980); eingegangen am 27. Dezember 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0454.pdf 
 Identifier    ZNB-1980-35b-0454 
 Volume    35 
96Author    Shinzi Kato, Shunji Yamada, Hideyuki Goto, Kiyomitsu Terashima, Masateru Mizuta, Tomonori KatadaRequires cookie*
 Title    A Convenient Preparation Method of Anhydrous Lithium, Potassium, Rubidium and Cesium Dithiocarboxylates  
 Abstract    Anhydrous Alkali Metal Dithiocarboxylates, Metal Hydride It has been found that a series of anhydrous alkali metal dithiocarboxylates are readily obtained in good yields by the reaction of dithio acid with metal hydride (LiH, NaH, KH), n-butyl lithium, or rubidium or cesium acetates, respectively. Their spectral data were compared. 
  Reference    Z. Naturforsch. 35b, 458—462 (1980); received December 7 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0458 
 Volume    35 
97Author    DavidW. Allen, J. David, BarrieG. Buckland, HutleyRequires cookie*
 Title    Electronic Effects of Aryl and Heteroaryl Groups on the Rate of Nucleophilic Displacement of Chlorine from 5-Heteroaryl(or Aryl)-2-chloropyrimidines by Piperidine  
 Abstract    The kinetics of nucleophilic displacement of chlorine from a series of 2-chloro-5-hetero-aryl(or aryl)pyrimidines by piperidine have been studied in order to assess the electronic effects of the 5-substituent. The observed order of reactivity is 5-(l-methylpyrrol-2-yl) < 5-7>-anisyl < 5-f>-tolyl < 5-phenyl < 5-(2-thienyl) < 5-(2-furyl) < 5-(m-chlorophenyl). The reactions are enthalpy-controlled and the rate data can be explained as a consequence of the electron-withdrawing or electron-donating ability of the 5-substituent. Synthetic routes to the compounds studied are also described. 
  Reference    Z. Naturforsch. 35b, 463—467 (1980); received November 19 1979 
  Published    1980 
  Keywords    5-Substituted Pyrimidines, Nucleophilic Displacement, Kinetic Studies, Heteroaryl Substituents 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0463.pdf 
 Identifier    ZNB-1980-35b-0463 
 Volume    35 
98Author    DavidW. Allen, DavidJ. Buckland, BarrieG. HutleyRequires cookie*
 Title    Electronic Effects of Aryl and Heteroaryl Groups on the Rate of Quaternization of 5-Aryl(or Heteroaryl)pyrimidines  
 Abstract    5-Substituted Pyrimidines, Quaternization Reactions, Kinetics, Heteroaryl Substituents The kinetics of quaternization of a series of 5-aryl-and 5-heteroarylpyrimidines with phenacyl bromide in acetonitrile have been studied in order to assess the electronic effects of the 5-substituent. The observed order of reactivity is 5-(l-methylpyrrol-2-yl) > 5-p-anisyl >5-(2-furyl) >5-p-tolyl > 5-(2-thienyl) >phenyl > 5-(m-chlorophenyl). The reactions are enthalpy controlled and the rate data can be accounted for in terms of the electron-withdrawing or donating ability of the 5-substituent. The substituent effects of the 2-fury 1-and 2-thienyl groups in the above reaction are significantly different from those observed in the piperidinolysis of 2-chloro-5(2-heteroaryl)pyrimidines. 
  Reference    Z. Naturforsch. 35b, 468—470 (1980); received November 19 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0468 
 Volume    35 
99Author    Shozi Yamashita, Giiti TomitaRequires cookie*
 Title    The Recombination Luminescence of Tryptophan in Aqueous Glasses, I Quenching Effect of Electron Scavengers  
 Abstract    Recombination Luminescence, Tryptophan, Trapped Electron, Electron Scavenger The quenching effect of Se(>4— and NO3 -(scavenger for trapped electrons) on the delayed luminescence ('recombination luminescence') caused by the recombination of trapped electrons with mother tryptophan cations was investigated in aqueous 9 M NaOH and 9.5 M LiCI glasses at 77 K. The results show that the trapped electrons responsible for the recombination fluorescence were deep-trapped ones in 9 M NaOH glasses and shallow-and deep-trapped ones in 9.5 M LiCI glasses. However, trapped electrons participating in the recombination phosphorescence were almost shallow-trapped ones in the two glasses. The distribution of the trapped electrons is discussed. 
  Reference    Z. Naturforsch. 35b, 471—474 (1980); received July 18/December 21 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0471.pdf 
 Identifier    ZNB-1980-35b-0471 
 Volume    35 
100Author    WolfgangW. Schoeller», U. H. BrinkerRequires cookie*
 Title    Towards a Classification of Singlet Carbenes  
 Abstract    Olefines, Singlet Carbenes According to one-electron perturbation theory singlet carbenes can be classified as (a) electrophilic, (b) nucleophilic or (c) ambiphilic in their addition properties towards olefines. The nucleophilicity of the cr-orbital in :CXiX2 should increase with decreasing electronegativity of Xi (X2). 
  Reference    Z. Naturforsch. 35b, 475—476 (1980); received July 6/November 7 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0475.pdf 
 Identifier    ZNB-1980-35b-0475 
 Volume    35 
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