| 61 | Author
| Z. Naturforsch | Requires cookie* | | Title
| Synthese und Dimerisierungsverhalten des l,l-Bis(trimethylsilyl)-2-(2,5-diisopropylphenyl)silens  | | | Abstract
| Tris(trim ethylsilyl)silylmagnesium bromide, (Me^SiX^SiMgBr, reacts with 2.5-diisopropyl-benzaldehyde to give 2,5-diisopropylphenyl-tris(trimethylsilyl)silylmethanol (1). With sodium | | |
Reference
| Z. Naturforsch. 51b, 370—3 (1996); eingegangen am 21. August 1995 | | |
Published
| 1996 | | |
Keywords
| Silenes, Silene Dimerization, 2, 3-Disilanaphthalenes Tetrahydro, 1, 2-Disilacyclobutanes | | |
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| default:Reihe_B/51/ZNB-1996-51b-0370.pdf | | | Identifier
| ZNB-1996-51b-0370 | | | Volume
| 51 | |
62 | Author
| JosephG. Robe, Duc Le Van, JostW. Innemöller, Bernt Krebs, M. Echtild Läge | Requires cookie* | | Title
| Reaktive E=C(p-p)7r-Systeme, XLIII [1] Darstellung und Charakterisierung P-Phosphino-oder P-Arsino-substituierter Fluorphosphaalkene des Typs R2E-P=C(F)NEt2 (R = Me, CF3, Me2N; E = P, As)  | | | Abstract
| Reactive E=C(p-p)-7r System s XLIII [1] Synthesis and Characterization o f P -Phosphino or P-A rsino Substituted Fluoro-phosphaalkenes of the Type R 2E -P=C (F)N Et2 (R = Me, C F 3, M e7N; E = R As) The easily accessible phosphaalkene HP=C(F)NEt2 (lb) reacts with halophosphanes or -arsanes R2EX (X = Cl, I) in the presence of NEt3 to give P-phosphino-or -P-arsino sub stituted fluorophosphaalkenes of the type RiE-P=C(F)NEti (2 -6) in high yields (60 -85 %) [R2E: (CF3)2P (2), Me2N(CF3)P (3), Me2P (4), (CF3)2As (5), M e2As (6)]. The analogous re-action of ib with CF3PI2 (molar ratio 1:2) unexpectedly leads to the triphosphetene Et2N | | |
Reference
| Z. Naturforsch. 51b, 778—784 (1996); eingegangen am 30. November 1995 | | |
Published
| 1996 | | |
Keywords
| Phosphaalkenes, 1, 2, 3-Triphosphetenes, NMR Spectra, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0778.pdf | | | Identifier
| ZNB-1996-51b-0778 | | | Volume
| 51 | |
63 | Author
| Z. Naturforsch | Requires cookie* | | Title
| ,1-Organoboration of Sterically Hindered Tetra-l-alkynylsilanes and the Crystal Structure of Tetrakis[l-(3,3-dimethyl)butynyl]silane  | | | Abstract
| Tetra-l-alkynylsilanes, Si(C sC R *)4 with R 1 = 'Bu (1) and SiMe3 (2) react with triethyl-borane, E t3B. by intermolecular 1,1-ethyloboration followed by intramolecular 1.1-vinylo-boration. to give the substituted siloles 3 and 5 with two R 'C = C groups linked to silicon. The formation of 5 (R 1 = SiMe3) requires exactly one equivalent of E t3B, whereas 3 (R 1 = 'Bu) is formed after = 2 0 d in boiling toluene in the presence of a large excess of E t3B, and the remaining 'B u -C = C groups in 3 do not react with E t3B. The 1,1-organoboration of 2 using one equivalent of 9-ethyl-9-borabicyclo[3.3.1]nonane, Et-9-BBN, proceeds similar to the E t3B-reaction, to give mainly the silole derivative 6, in which the bicyclic ring system is enlarged by two carbon atoms. This product is the result of a kinetically controlled reaction. The single crystal X-ray analysis of 1 has been carried out (space group Pnm a; a = 990.0(2), b = 1668.0(3), c = 1479.0(3) pm), and its crystal structure is com pared with that of the corre sponding tin compound 1 (Sn). | | |
Reference
| Z. Naturforsch. 51b, 1320—1324 (1996); received March 14 1996 | | |
Published
| 1996 | | |
Keywords
| Tetra-l-alkynylsilanes, 1, 1-Organoboration, Siloles, X-Ray | | |
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| default:Reihe_B/51/ZNB-1996-51b-1320.pdf | | | Identifier
| ZNB-1996-51b-1320 | | | Volume
| 51 | |
64 | Author
| Clemens Krempner1, Rhett Kempeb, Hartmut Oehme3 | Requires cookie* | | Title
| The Thermal Isomerization of a Tetrahydro-2,3-disilanaphthalene into a 1,2-Disilacyclobutane -The Conversion of a Formal Silene [2+4] Cyclodimer into the [2+2] Cycloadduct  | | | Abstract
| 1,2,3,8a-Tetrahydro-1 -mesityl-5,7,8a-trimethyl-2,2,3,3-tetrakis(trimethylsilyl)-2,3-disila-naphthalene (3), the formal [2+4] cyclodimer of the transient 2-mesityl-l,l-bis(trimethylsilyl)-silene (2), on thermal treatment gradually isomerizes to give a mixture of the [2+2] products (E)-and -predominantly -(Z)-3,4-dimesityl-1,1,2,2-tetrakis(trimethylsilyl)-l,2-disilacyclo-butane [(E/Z)-4], By prolonged heating or at higher temperatures both (E/Z)-3 and (Z)-4 are converted into (E)-4, the thermodynamically most stable head-to-head dimer of 2. Possible pathways of the isomerization processes are discussed. | | |
Reference
| Z. Naturforsch. 52b, 815—818 (1997); received February 14 1997 | | |
Published
| 1997 | | |
Keywords
| Silenes, Silene Dimerization, 2, 3-Disilanaphthalene Tetrahydro, 1, 2-Disilacyclobutane | | |
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| default:Reihe_B/52/ZNB-1997-52b-0815.pdf | | | Identifier
| ZNB-1997-52b-0815 | | | Volume
| 52 | |
65 | Author
| Z. Naturforsch | Requires cookie* | | Title
| Acyclo C-Nucleosides Analogues of Condensed 1,2,4-Triazines  | | | Abstract
| 1-Acyclo C-nucleosides of 7-methyl-10//-l,2,4-triazolo[3,,4':3,4][l,2,4]triazino[5,6-£>]indoles (9) have been prepared by cyclodehydrogenation of the sugar derivatives of 3-hydrazino-8-methyl-5//-l,2,4-triazino[5,6-6]indole (1). The respective linear isomer as 4 has been pre pared by a dehydrative cyclization of the amides of 1. Acetylation of the sugar hydrazones and their cyclized products gave the per-7V,0-acetyl derivatives. The molecular connectivity of the products was established by *H, 13C, and 2D H ,H Cosy spectra. | | |
Reference
| Z. Naturforsch. 52b, 873—882 (1997); received February 17 1997 | | |
Published
| 1997 | | |
Keywords
| Acyclo C-Nucleoside, 1, 2, 4-Triazine, Indole, Triazinoindole, Triazolotriazinoindole | | |
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| default:Reihe_B/52/ZNB-1997-52b-0873.pdf | | | Identifier
| ZNB-1997-52b-0873 | | | Volume
| 52 | |
66 | Author
| Wolfgang Malisch, Klaus Grün3, Alexander Frieda, Wolfgang Reicha, Martin Schmeußer1, Udo Weis3, Christa Abd, El Baky3, Carl Krügerb | Requires cookie* | | Title
| Phosphenium-Komplexe, X X IX [1]  | | | Abstract
| [4+2]-Cycloadditionen von Phospheniumkomplexen des Typs C p (O C)2W = P R 2 (R = Alkyl, A ryl) mit 2,3-Dimethylbutadien Phosphenium Complexes, X X IX [1], [4+2]-Cycloaddition of Phosphenium Complexes of the Type Cp(OC)2W=PR2 (R = Alkyl, Aryl) with 2,3-Dimethylbutadiene The phosphenium complexes Cp(OC)2W=PR2 [R = Ph, o-Tol, Me, t-Bu, (2a -d)] react with 2,3-dimethyl-1,3-butadiene (3) via [4+21-cycloaddition to form the phosphametallacyclohexe nes Cp(OC)2W-PR2-CH2-CMe=CMe-CH2 (4a -d). The structure of 4a has been determined by X-ray diffraction. | | |
Reference
| Z. Naturforsch. 53b, 1506—1510 (1998); eingegangen am 12. Mai 1998 | | |
Published
| 1998 | | |
Keywords
| Phosphenium Complexes, 1, 3-Dienes, [4+2]-Cycloaddition, Phosphametallacyclohexenes | | |
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| default:Reihe_B/53/ZNB-1998-53b-1506.pdf | | | Identifier
| ZNB-1998-53b-1506 | | | Volume
| 53 | |
67 | Author
| Kristallstruktur Neuer, Kai Landskron, Wolfgang Schnick | Requires cookie* | | Title
| Synthese und  | | | Abstract
| -diphosphazenium bromide [(NH->)3PNP(NHi)3]Br, nitrate 1(NH2)3PNP(NH2)3][N03], and toluene-4-sulfonate [(NH2)3PNP(NH2)3][CH3C6H4S0 3] have been prepared by anion exchange in aqueous solution. Single crystals were obtained from acetonitrile solutions in a temperature gradient between 60 °C and room temperature. The crystal structures were determined by single crystal X-ray methods at room temperature. ([(NH2)3PNP(NH2)3]Br: P i, Z = 2, a = 596.2(1),b = 744.5(1), c = 1114.4(1) pm, a = 108.78(1), ß = 104.18(1), 7 = 90.64(1)°, R 1 = 0.048, wR2 = 0.104; [(NH2)3PNP(NH2)3][N03]: Pi, Z = 2, a = 550.9(1), b = 796.3(1), c = 1115.7(1) pm, a = 94.45(1), ß = 99.55(1), 7 = 101,53(1)°, R l = 0.033, wR2 = 0.095; [(NH2)3PNP(NH2)3][CH3C6H4S 0 3]: P2,/c, Z = 4, a = 804.1(1), b = 596.1(1), c = 3218.7(3) pm, ß = 94.59(1)°, /?1 = 0.052, wR2 = 0.136). In the solid the three salts consist of discrete [(NHi)3PNP(NH2)3]+ cations and their corresponding anions. The PN4 tetrahedra in [(NH2)3PNP(NH2j3]Br are staggered, while in [(NH2)3PNP(NH2)3][N03] the eclipsed conformation is preferred. The PN4 tetrahedra of [(NH2)3PNP(NH2)3][CH3C 6H4S 0 3] show gauche conformation. | | |
Reference
| Z. Naturforsch. 54b, 1363—1370 (1999); eingegangen am 13. Juli 1999 | | |
Published
| 1999 | | |
Keywords
| 3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium-Salze Synthesis and Crystal Structure of Novel l, l, l, 3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium Salts Phosphazenes, Ion Exchange, Crystal Structure 1, 1, 1, 3, 3, 3-Hexaamino-lA\3A5 | | |
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| default:Reihe_B/54/ZNB-1999-54b-1363.pdf | | | Identifier
| ZNB-1999-54b-1363 | | | Volume
| 54 | |
68 | Author
| Hans-Dieter Eßwein, Günter Häfelinger | Requires cookie* | | Title
| Bestimmung von Ringstromanisotropieeffekten im 1 H-NMR -Spektrum von 9-Phenylderivaten des 1.4-Dimethylanthracens und 1.4-Dimethyltriptycens Determination of Ring Current Anisotropy Effects in the X H NMR Spectra of 9-Phenyl Derivatives of 1,4-Dimethylanthracene and 1,4-Dimethyltriptycene  | | |
Reference
| Z. Naturforsch. 33b, 1026—1032 (1978); eingegangen am 31. Mai 1978 | | |
Published
| 1978 | | |
Keywords
| Ring Current, Anisotropy Effects, 1 H NMR, 9-Phenyl Derivatives, 14-Dimethylanthracene, 1, 4-Dimethyltriptycene | | |
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| default:Reihe_B/33/ZNB-1978-33b-1026.pdf | | | Identifier
| ZNB-1978-33b-1026 | | | Volume
| 33 | |
70 | Author
| Reiner Luckenbach, Nikolaus Müller | Requires cookie* | | Title
| Zur elektrocyclischen Ringöffnung von Cyclopropylhalogeniden bei der Reaktion mit Natriumiodid in Aceton Electrocyclic Ring Opening of Cyclopropyl Halides in the Course of their Reaction with Sodium Iodide in Acetone  | | | Abstract
| Reaction of cyclopropyl halides with sodium iodide in acetone [i.e. under typical Sis-2-conditions), proceeds via ring opening to allylic systems finally yielding 1,5-hexadienes upon dimerisation; ring-retained products were not detected. Application of the Wood-ward-Hoffmann rules lends strong support to a cationic synchronous mechanism. This is also confirmed by kinetic measurements proving this reaction to be first order over all. The kinetic data are shown to fit the Hammett equation using cr-values for cyclopropyl bromides and o + -values for geminal cyclopropyl dichlorides, respectively. The validity of the Woodward-Hoffmann-De Puyrule (according to which in synchronous reactions leaving groups situated endo are strongly favored over those situated exo) is tested in corresponding experiments involving condensed ring systems. I. Zum Problem der nukleophilen Substitution an Cyclopropylsystemen In der vorliegenden Arbeit werden die Reaktionen von 2-phenylsubstituierten Cyclopropylhalogeniden unter typischen SN2-Bedingungen (Umsetzung mit Natriumiodid in Aceton) untersucht. Zunächst | | |
Reference
| Z. Naturforsch. 34b, 464—480 (1979); eingegangen am 10. August/19. Dezember 1978 | | |
Published
| 1979 | | |
Keywords
| Ring Opening, Woodward-Hoffmann Rules, Allylic Cations, Dimerisation, 1, 5-Hexadienes | | |
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| default:Reihe_B/34/ZNB-1979-34b-0464.pdf | | | Identifier
| ZNB-1979-34b-0464 | | | Volume
| 34 | |
71 | Author
| UlrichW. Gerwarth | Requires cookie* | | Title
| Borverbindungen, 12. Mitteilung Das Kristallisationsverhalten der Poly(2-phenyl-1.3.2-dioxabora-cycloalkane) Boron Compounds, Part 12 The Crystallizing Behaviour of Poly(2-phenyl-l,3,2-dioxybora-cycloalkanes)  | | |
Reference
| Z. Naturforsch. 34b, 1084—1091 (1979); eingegangen am 4. April 1979 | | |
Published
| 1979 | | |
Keywords
| 1, 3, 2-Dioxybora-cycloalkanes, Ligand Exchange, Metathetic Rearrangement, Cyclic Oligomers, Thermal Analysis | | |
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| default:Reihe_B/34/ZNB-1979-34b-1084.pdf | | | Identifier
| ZNB-1979-34b-1084 | | | Volume
| 34 | |
72 | Author
| Werner Winter, Hanspeter Bühl, Herbert Meier | Requires cookie* | | Title
| Structure Determination of 3,5-Biscyclohexylidene-l,2,4-trithiolane  | | |
Reference
| Z. Naturforsch. 35b, 1015—1018 (1980); eingegangen am 14. März 1980 | | |
Published
| 1980 | | |
Keywords
| Fragmentation of 1, 2, 3-Thiadiazoles, 1, 2, 4-Trithiolanes, X-ray | | |
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| default:Reihe_B/35/ZNB-1980-35b-1015.pdf | | | Identifier
| ZNB-1980-35b-1015 | | | Volume
| 35 | |
73 | Author
| Egon Fahr, Peter Fecher | Requires cookie* | | Title
| Die Darstellung von 1.3-Dunethyl-6-hydroxy-dihychothymin durch photochemische Wasser-Addition an 1.3-Dimethyl-thymin + Preparation of 1,3-Dimethyl-6-hydroxy-dihydrothymine by Photochemical Addition of Water to l,3-Dimethyl-thymine +  | | | Abstract
| UV irradiation of aqueous solutions of 1,3-dimethyl-thymine with wavelength > 280 nm yields the eis-and trans-form of water addition product l,3-dimethyl-6-hydroxy-dihydro-thymine (2/3). | | |
Reference
| Z. Naturforsch. 36b, 226—230 (1981); eingegangen am 16. Juli 1980 | | |
Published
| 1981 | | |
Keywords
| UV Irradiation, 1, 3-Dimethyl-thymine, l, 3-Dimethyl-6-hydroxy-dihydro-thymine | | |
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| default:Reihe_B/36/ZNB-1981-36b-0226.pdf | | | Identifier
| ZNB-1981-36b-0226 | | | Volume
| 36 | |
74 | Author
| Marianne Baudler, Jochen Hellmann | Requires cookie* | | Title
| Contributions to the Chemistry of Phosphorus, 89 [1] Cyclization of a 1,3-Dihalogen-1,2,3- triorganyltriphosphane to the Corresponding Triorgany 1-cy clotriphosphane  | | | Abstract
| Tri-Jerf-butyl-cyclotriphosphane is obtained by the dehalogenation of l,3-diiodo-l,2,3-tri-£erf-butyl-triphosphane with lithiumhydride. This reaction represents a so far unknown type of ring-closure leading to cy clotriphosphanes, which corresponds to the classical synthesis of cyclo -propanes starting from 1,3-dichloropropanes. | | |
Reference
| Z. Naturforsch. 36b, 266—267 (1981); eingegangen am 13. Oktober 1980 | | |
Published
| 1981 | | |
Keywords
| 1, 3-Dihalogen-1, 2, 3-triorganyltriphosphanes, Cy clotriphosphanes, Tri-feri-butylcyclotriphosphane | | |
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| default:Reihe_B/36/ZNB-1981-36b-0266_n.pdf | | | Identifier
| ZNB-1981-36b-0266_n | | | Volume
| 36 | |
76 | Author
| Albini, H. Kisch | Requires cookie* | | Title
| A  | | | Abstract
| Chromium and tungsten carbonyls react with 3,3,4,4-tetramethyl-l,2-diazetine (1) or its mono-N-oxide (2) to form complexes (l)M(CO)5, (l)2M(CO)4, (l)M2(CO)io, (l)2M2(CO)8, (l)3M2(CO)6 or (2)M(CO)5 and (2)2M(CO)4, resp. In the reactions of 2 some deoxygenation affords complexes of 1 as by-products. The stability of these and other complexes of the N=N group is related to the ring size of the cyclic diazene ligand. | | |
Reference
| Z. Naturforsch. 37b, 468—472 (1982); received November 13 1981 | | |
Published
| 1982 | | |
Keywords
| I, 2-Diazetines, 1, 2-Diazetine-N-oxide, Chromium Complexes, Tungsten Complexes | | |
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| default:Reihe_B/37/ZNB-1982-37b-0468.pdf | | | Identifier
| ZNB-1982-37b-0468 | | | Volume
| 37 | |
77 | Author
| Alfred Gieren, Viktor Lamm, RobertC H Addon, M. Artin, L. Kaplan, M.John Perkins, Peter Flowerday | Requires cookie* | | Title
| Vergleichende Röntgenstrukturanalysen von Naphthothiadiazinen und isovalenzelektronischen Naphthotriazinen-I-nstitut für B iochem ie, A bt. Strukturforschung I, D-8033 Martinsried  | | | Abstract
| Röntgenstrukturanalysen von Acenaphthyleno[5,6-cd][l,2,6]-thiadiazin, 2-Methyl-2 H-acenaphthyleno[5,6-de]-l,2,3-triazin und Naphtho[l,8-de]thiadiazin Comparison of Naphthothiadiazines and Isoelectronic Naphthotriazines by X-Ray Structural Analysis X-Ray Structural Analyses of A cenaphthyleno[5,6-cd][l,2,6]thiadiazine, 2-M ethyl-2H -acenaphthyleno[5,6-de]-l,2,3-triazine and N ap h th o [l,8-de]thiadiazine We have performed an X-ray structural analysis of the sulphur diimide 1 and the isoelectronic triazine 2. In addition we found two crystal m odifications o f the sulphur diimide 3, which is an analogue o f the previously characterized 4, but the m odification suitable for X-ray analysis (tetra gonal, ß) was disordered. From the bond lengths o f 1 and 2 results, that in both cases there is only | | |
Reference
| Z. Naturforsch. 39b, 975 (1984); eingegangen am 27. D ezem ber 1983 | | |
Published
| 1984 | | |
Keywords
| Sulphur D iim ides, 1, 2, 3-Triazines, X -R ay, Bonding Relationships | | |
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| default:Reihe_B/39/ZNB-1984-39b-0975.pdf | | | Identifier
| ZNB-1984-39b-0975 | | | Volume
| 39 | |
78 | Author
| Richard Neidlein, Reiner Gottfried, Alfred Gieren, Carsten-P Kaerlein, Thomas Hübner | Requires cookie* | | Title
| Kupplungsreaktionen von Diazoniumsalzen mit 3-ferf-Butoxy- l,6-methano[10]annulen und Röntgenstrukturanalyse eines Vertreters Coupling Reactions of Diazonium Salts with 3-terr-Butoxy-l,6-methano[10]annulene and X-Ray Structure Analysis of one Compound  | | | Abstract
| The syntheses of 5a—c by coupling reactions of 3-terr-butoxy-l,6-methano[10]annulene with different aryldiazonium salts as well as their spectroscopic properties are described; an X-ray structure analysis of 5c is reported. | | |
Reference
| Z. Naturforsch. 40b, 193—198 (1985); eingegangen am 20. August 1984 | | |
Published
| 1985 | | |
Keywords
| Syntheses with Coupling Reactions, 1, 6-Methano[10]annulenylarylhydrazones, X-Ray, Bonding Relationships | | |
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| default:Reihe_B/40/ZNB-1985-40b-0193.pdf | | | Identifier
| ZNB-1985-40b-0193 | | | Volume
| 40 | |
80 | Author
| Werner Schnurr, Manfred Regitz | Requires cookie* | | Title
| Phosphorverbindungen ungewöhnlicher Koordination, 31 [1] Cycloaddition von Diazoverbindungen an ein P—Chlor-phosphaalken Phosphorus Compounds with Unusual Coordination, 31 [1] Cycloaddition of Diazo Compounds onto a P—Chloro-phosphaalkene  | | | Abstract
| Chloro bis(trimethylsilyl)methylene phosphane (4) reacts with the diazo compounds 5, 10, 15 and 20 even at low temperatures with formation of the 3H-l,2,4-diazaphospholes 6,11,16 and 21. The products are unstable and decompose either with elimination of nitrogen to yield 1-chloro phosphiranes (9,14, 19 and 22), or isomerize with aromatization (11 —> 13) or transformation into 4,5-dihydro-l,2,4-diazaphospholes (6—> 8, 16—» 18) by trimethylsilyl shifts. Silyl groups attached to ring nitrogen are easily hydrolized (8 —> 7,13 —» 12, 18 —> 17), those attached to ring carbon are cleaved by treatment with potassium fluoride in dimethyl formamide (7 —> 23, 12 —> 24). | | |
Reference
| Z. Naturforsch. 43b, 1285—1292 (1988); eingegangen am 20. Juni 1988 | | |
Published
| 1988 | | |
Keywords
| Chloro-methylene Phosphanes, Diazo Compounds, 1, 2, 4-Diazaphospholes, 1-Chlorophosphiranes | | |
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| default:Reihe_B/43/ZNB-1988-43b-1285.pdf | | | Identifier
| ZNB-1988-43b-1285 | | | Volume
| 43 | |
|