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1Author    W. J. Stec, R. Kinas, A. OkruszekRequires cookie*
 Title    Configurational Assignments to 2-X-2-Y-4-methyl-l,3,2-dioxaphosphorinans  
  Reference    (Z. Naturforsch. 31b, 393—395 [1976]; received July 17 1975) 
  Published    1976 
  Keywords    Dioxaphosphorinans, Configuration, Conformation 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0393_n.pdf 
 Identifier    ZNB-1976-31b-0393_n 
 Volume    31 
2Author    F. Fehér, B. EngelenRequires cookie*
 Title    Beiträge zur Chemie des Schwefels, 116 [1] Kristall-und Molekülstrukturen von und 3-Methyl- Contributions to the Chemistry of Sulfur, 116 [1] Crystal and Molecular Structures of 1,2,4,5-Benzotetrathiepine and 3-Methyl-1,2,4,5-benzotetrathi  
 Abstract    The structures of 1,2,4,5-benzotetrathiepine and 3-methyl-l,2,4,5-benzotetrathiepine were determined by X-ray structure analysis. The constitution of the molecules, which was proposed by way of spectroscopic data, could be verified. The conformation of the seven-membered rings is the chair form. The position of the methyl group in 3-methyl-1,2,4,5-benzotetrathiepine is equatorial with respect to the seven-membered ring. Details of the conformations are discussed. Bond distances and angles are compared with those in other molecules, which have similar structures. 
  Reference    Z. Naturforsch. 34b, 426—430 (1979); eingegangen am 18. Oktober 1978 
  Published    1979 
  Keywords    X-ray, Cyclosulfanes, Conformation 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0426.pdf 
 Identifier    ZNB-1979-34b-0426 
 Volume    34 
3Author    Martin DrägerRequires cookie*
 Title    5-Chlor-5-phenyl-l-oxa-4.6-dithia-5-stannocan, ein diplanarer Übergangszustand bei der Racemisierung der Wanne-Sessel- Konformation in einem 8-Ring [1] 5-Chloro-5-phenyl-l-oxa-4,6-dithia-5-stannocane, a Diplanar Transition State for the Racemisation of the Boat-Chair Conformation in an Eight-Membered Ring [1]  
 Abstract    The title compound has been synthesized from PhSnCl3 and the disodium salt of bis(2-mercaptoethyl)ether. The crystal structure has been determined and refined to R — 0.033. The conformation of the eight-membered heterocycle is slightly disordered and represents a diplanar form, which is generally considered the transition state near the saddle point of the energy surface between the two enantiomers of the boat-chair con-formation. The configuration around tin is a trigonal bipyramid with equatorial sulfur atoms, an equatorial phenyl group and with axial atoms CI and O (transannular distance Sn--0 241 pm). 
  Reference    Z. Naturforsch. 36b, 437—440 (1981); eingegangen am 4. Februar 1980 
  Published    1981 
  Keywords    Tin, Heterocycles, Conformation, Transition State 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0437.pdf 
 Identifier    ZNB-1981-36b-0437 
 Volume    36 
4Author    Alfred Gieren, Viktor Lamm, Dieter Oesterhelt, Hans-Jörg SchludeRequires cookie*
 Title    Röntgenstrukturanalyse des 4-Keto-a//-*rcms-retinals X-ray Structure Analysis of the 4-Keto-aW-/rafts-retinal  
 Abstract    The title compound (C20H26Ü2) crystallizes in the monoclinic space group P2i/n with a = 14.761(2), 6 = 8.292(1), c = 15.210(2) Ä, /S= 102.40(1)°; Z = 4. The structure was solved by direct methods and refined by least squares to a final R-value of 0.038 for 1211 observed reflections. The crystal structure is isomorphous with that of all-trans-retinal. The cyclohexenone ring shows a half-boat conformation. The connection of the cyclo-hexenone ring and the conjugated polyene chain via a formal single C-C bond is s-cis. The torsion angle C(5)-C(6)-C(7)-C(8) amounts to 56°. For the polyene side chain the typical curvature is evident. A comparison with analogous compounds shows that details in conformation, especially at the ring side-chain connection, are induced by crystal matrix. It seems that the differences in biological activity between retinal analogous compounds are not reflected by conformational differences of the free molecules. 
  Reference    Z. Naturforsch. 37b, 1612—1622 (1982); eingegangen am 1. Juni 1982 
  Published    1982 
  Keywords    N-ray, Retinal, Conformation 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1612.pdf 
 Identifier    ZNB-1982-37b-1612 
 Volume    37 
5Author    Gabi Reber, Jürgen Riede, Gerhard MüllerRequires cookie*
 Title    Molecular Structure of (o-Trimethylsilyl- benzyl)diphenylphosphine  
 Abstract    (o-Trimethylsilylbenzyl)diphenylphosphine (1) crystallizes in the monoclinic space group P2 Jn with a = 14.088(2), b = 8.712(1), c = 16.481(2)Ä, ß = 101.63(1)°, V -1981.3Ä\ Z = 4. There is no P-Si interaction in the solid state which is also found for the solution (31 P NMR, l3 C NMR). 
  Reference    Z. Naturforsch. 43b, 915—917 (1988); eingegangen am 18. März 1988 
  Published    1988 
  Keywords    Benzyl-phosphines, Conformation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0915_n.pdf 
 Identifier    ZNB-1988-43b-0915_n 
 Volume    43 
6Author    G.Erhard Müller, Joachim Lachm, Jürgen RiedebRequires cookie*
 Title    Molekülstrukturen von (o-Brombenzyl)diphenylphosphan und l,3-Bis(diphenylphosphinomethyl)benzol M olecular Structures of (o-Bromobenzyl)diphenylphosphine and l,3-Bis(diphenylphosphinomethyl)benzene  
  Reference    Z. Naturforsch. 47b, 823—828 (1992); eingegangen am 3. Februar 1992 
  Published    1992 
  Keywords    Benzylphosphines, Conformation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0823.pdf 
 Identifier    ZNB-1992-47b-0823 
 Volume    47 
7Author    Christian Meyer3, Dietrich Mootza, Birgit Bäckb, Rolf MinkwitzbRequires cookie*
 Title    Bis(trifluormethyl)disulfan und -trisulfan: Molekülgeometrie im festen Zustand [1] Bis(trifluoromethyl)disulfane and Trisulfane: Molecular Geometry in the Solid State [1]  
 Abstract    The solid-state structures of the low-melting compounds bis(trifluoromethyl)disulfane (CF3SSCF3, triclinic, space group P I, Z = 2) and bis(trifluoromethyl)trisulfane (CF3SSSCF3, monoclinic, space group C2/c, Z = 4) have been determined on single crystals with M oK a radiation at -160°C. The trisulfane has trans conformation. The geometry of both molecules agrees well with results of electron diffraction on the gaseous state. A comparison is made also with the crystal structures of the related molecules CF3TeTeCF3 and CF3OOOCF3. 
  Reference    (Z. Naturforsch. 52b, 69—71 [1997]; eingegangen am 15. Juli 1996) 
  Published    1997 
  Keywords    Conformation, Crystal Structure, Sulfane 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0069.pdf 
 Identifier    ZNB-1997-52b-0069 
 Volume    52 
8Author    Requires cookie*
 Title    Three-membered Rings. Molecular Structure and Conformation of Aryl Substituted Oxiranes by Dipole Moment Measurements  
 Abstract    and C a r l o B a t t i s t i n i , B r u n o M a c c h i a , a n d F r a n c o M a c c h i a The electric dipole moments of some styrene and trans-and cis-stilbene oxides have been measured, in benzene. From these data some bond angles have been calculated and it has been deduced that in the styrene derivatives the phenyl group is in rapid interconversion about the bond with the triatomic ring. 
  Reference    (Z. Naturforsch. 32b, 1467—1472 [1977]; received April 22 1977) 
  Published    1977 
  Keywords    Styrene Oxides, Stilbene Oxides, Structure, Conformation, Dipole Moments 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-1467.pdf 
 Identifier    ZNB-1977-32b-1467 
 Volume    32 
9Author    Salvatore SorrisoRequires cookie*
 Title    Dielectric Measurements and Molecular Structure. Styrene Oxides and Phenylcyclopropanes  
 Abstract    The effects of electronic structure and conformation of the molecules YC6H4CHOCH2 1 1 (Y = o, m, and p-Cl) and Y'C6H4CHCCl2CH2 (Y' = o, and m-Cl) have been studied in benzene between 10.0 and 70.0 °C. In the oxirane systems the conjugation between the two rings is very small, if present at all; consequently, in the absence of steric and/or electrostatic hindrance internal rotation is observed. In the cyclopropane systems ex-amined these steric effects are sufficiently important to completely immobilise the molec-ular structure. 
  Reference    Z. Naturforsch. 34b, 1298—1302 (1979); received March 8/May 7 1979 
  Published    1979 
  Keywords    Styrene Oxides, Cyclopropanes, Conformation, Dipole Moments 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1298.pdf 
 Identifier    ZNB-1979-34b-1298 
 Volume    34 
10Author    Heinz Falk, Klaus ThirringRequires cookie*
 Title    Beiträge zur Chemie der Pyrrolpigmente, XXXIII [1] Darstellung, Struktur und Eigenschaften von isomeren N-Methyl-Bilatrienen-abc (N-Methyl-etiobiliverdine-IV-y) On the Chemistry of Pyrrole Pigments, XXXIII [1] Synthesis, Structure and Properties of Isomeric N-Methyl-bilatrienes-abc (N-Methyl-etiobiliverdines-IV-y)  
 Abstract    Methylation of etiobiliverdin-IV-y yields a ring-A N-methylated product the structure of which was proven by comparison with the corresponding monolactimether and the ring-B methylated product which was synthesized on an independent route. The configura-tion (Z,Z,Z) was deduced by iH-NMR experiments and a more or less helical conformation which is most twisted at the ring-A methine fragment was found. Photoisomerization exclusively takes place at this position giving the (E,Z,Z) diastereomer, a reaction which is discussed in terms of the correlation of light absorption, methine single bond twist and photochemical selectivity. 
  Reference    Z. Naturforsch. 34b, 1448—1453 (1979); eingegangen am 25. Mai 1979 
  Published    1979 
  Keywords    UY-VIS, iH-NMR, Photoisomerization, Configuration, Conformation 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1448.pdf 
 Identifier    ZNB-1979-34b-1448 
 Volume    34 
11Author    K. Barlos, Heinrich NöthRequires cookie*
 Title    Beiträge zur Chemie des Bors, CVIII [1] Synthese und Konformation yon N.N'-Bis(boryl)-N.N'-dimethylhydrazinen Contributions to the Chemistry of Boron, CVIII [1] Synthesis and Conformation of N,N , -Bis(boryl)-N,N'-dimethylhydrazines N,N'-Bis(methylboryl)-N,N'-dimethyl-hydrazine, N,N'-Bis(dichlor-boryl)-N,N  
  Reference    (Z. Naturforsch. 35b, 125—132 [1980]; eingegangen am 10. August 1979) 
  Published    1980 
  Keywords    -dimethyl-hydrazine, Conformation, NMR Spectra, PE Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0125.pdf 
 Identifier    ZNB-1980-35b-0125 
 Volume    35 
12Author    Harald Lehner, Corinna Krauss, Hugo ScheerRequires cookie*
 Title    Solvent Induced Circular Dichroism in Conformational Analysis: Bile Pigments  
 Abstract    The applicability of solvent induced circular dichroism (SICD) for the conformational analysis of bile pigments has been investigated. The S-(—)-ethyl lactate induced rotational strengths for octaethylbilindion (4) and its dihydroderivative 5 are remarkably high. Related compounds, e.g. the isomeric purpurines 1 and 2 and formyltripyrrinon 3 exhibit an optical activity which is smaller by more than one order of magnitude. 1-3 are essen-tially free from steric strain so that a flat arrangement of the chromophore is most likely. On the other hand the closed conformations of 4 and 5 experience considerable steric repulsion of their terminal rings, so that a helical topology is energetically favoured. This distinction is reflected in the magnitude of the SICD observed and demonstrates its applicability for the conformational analysis of bile pigments. 
  Reference    Z. Naturforsch. 36b, 735—738 (1981); received November 21 1980 
  Published    1981 
  Keywords    Solvent Induced Circular Dichroism, Conformation, Enantiomerization, Purpurines, Bilatrienes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0735.pdf 
 Identifier    ZNB-1981-36b-0735 
 Volume    36 
13Author    Rainer Mattes, Franz WaldmannRequires cookie*
 Title    Molekülstruktureii, Schwingungsspektren und Konformation der Thiooxalsäurederivate CH3S-CO-CONH2, CH3S-CS-CONH2, C2H50-C0-CSNH2 und K[OSC-CONH2] Molecular Structure, Vibrational Spectra and Conformation of the Thiooxalic Acid Derivatives CH3S-CO-CONH2, CH3S-CS-CONH2, C2H50-C0-CSNH2 and K[OSC-CONH2]  
 Abstract    The crystal structures ofCH3S-CO-CONH2 (1), CH3S-CS-CONH2 (2), C2H50-C0-CSNH2 (3) and K[OSC-CONH2] (4) have been determined by single crystal X-ray diffraction. The molecules 1, 2 and 3 are nearly planar and form centrosymmetric dimers by N H • • • O or N-H--S hydrogen bonds with the amidic oxygen or sulfur atom as acceptor atoms. The anion of 4 is not quite planar. The torsional angle around the C-C bond is 18.4°. The con-formations of the title compounds are E, Z' (1 and 2), Z, Z' (3) and Z (4). According to the vibrational spectra, which are discussed briefly, 1 and 3 retain their conformation also in solution. 
  Reference    Z. Naturforsch. 38b, 335—340 (1983); eingegangen am 5. November 1982 
  Published    1983 
  Keywords    Molecular Structure, Conformation, Vibrational Spectra, Thiooxalic Acid Derivatives 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0335.pdf 
 Identifier    ZNB-1983-38b-0335 
 Volume    38 
14Author    Ludwig Roß, Martin DrägerRequires cookie*
 Title    Phases of Decaphenylcyclopentagermane (Ph2Ge)s [1]  
 Abstract    (Pb^Ges) can be obtained from solutions in five crystalline phases, two pure and three including solvent of crystallization. This is lost at 70 °C. At 190 °C all phases transform into a plastic crystalline phase. For this tetragonal phase a gear wheel model for librations of the molecules is developed. The crystal structure of triclinic (Ph2Ge)s has been determined and refined to R = 0.050. The molecule has a flexible conformation in accordance with a better solubility than exhibited by the homologous rings (Ph2Ge)4 and (Ph2Ge)6 containing rigid normal conformations. The arrangement of phenyl groups is either parallel or perpendicular for both cases intra-and intermolecular. The compound (Ph2Ge)6 attains a plastic crystalline state at 346 °C. 
  Reference    Z. Naturforsch. 38b, 665—673 (1983); eingegangen am 28. Januar 1983 
  Published    1983 
  Keywords    Germanium, Homocycle, Conformation, Plastic Crystalline State 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0665.pdf 
 Identifier    ZNB-1983-38b-0665 
 Volume    38 
15Author    Anders Ljungqvist, Karl FolkersRequires cookie*
 Title    Study of Hydrogenolytic Cleavage of Peptide-Resin Benzyl Ester Bonds for Synthesis of Protected Fragments of the Human Leukocyte Interferon  
 Abstract    Three Boc-protected fragments of the human leukocyte interferon, LeIFA, have been synthesized: I, BOC LeIFA (99-105) (BOC-Val-Ile-Gln-Gly-Val-Gly-Val); II, BOC LeIFA (116-119) (BOC-Ile-Leu-Ala-Val); III, BOC LeIFA (123-126) (BOC-Phe-Gln-Arg(Tos)-Ile). The presence of the Boc-group was desired so that these peptides could serve as intermediates in fragment condensation toward larger segments of interferon. To achieve these intermediates, a study was desirable on three methods of cleavage of the benzyl ester-polymer bonds. It was found that hydrogenolysis with hydrogen and palla-dium generated in situ was distinctly superior to transfer hydrogenation with ammonium formate or cyclohexene. An effective swelling of the peptide-resin to allow penetration of palladium acetate into the matrix and mobility of the peptide chains on the resin to expose the benzyl ester bond to hydrogenolysis appear to be essential conditions for the best cleavage. 
  Reference    Z. Naturforsch. 38b, 1022—1024 (1983); received May 2 1983 
  Published    1983 
  Keywords    Interferon, Peptide Synthesis, Hydrogenation, Palladium Black, Conformation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1022.pdf 
 Identifier    ZNB-1983-38b-1022 
 Volume    38 
16Author    Otto Mündt, Heinz Riffel, Gerd Becker, Arndt SimonRequires cookie*
 Title    Element—Element-Bindungen, IV [1] Molekül-und Kristallstruktur des Tetramethyldiphosphans und -diarsans Element—Element Bonds, IV [1] Molecular and Crystal Structure of Tetramethyldiphosphane and -diarsane  
 Abstract    The molecular and crystal structures of the isotypic compounds tetramethyldiphosphane 1 and -diarsane 2 have been determined by single crystal X-ray diffraction (monoclinic; C2/m; Z = 2; 1/2: -155/-144 °C\a = 540.6(2)/555.8(2); b = 1131.0(6)/l 136.7(6); c -602.5(2)/612.8(2) pm;/? = 97.31(3)/95.24(3)°;P-P 221.2(1)/As-As 242.9(1) pm). In accordance with the crystallographically imposed symmetry 2/m, the molecules adopt antiperiplanar conformation. Their crystal structures are closely related to those of the homologues tetramethyldistibane 3 [1] and -dibismuthane 4 [3]. As found for the latter compounds, the E —E units (E = P, As) are also aligned in linear chains, but the intermolecular E---E contacts (P-P 381/As---As 370 pm) do not allow any extended interaction between molecules, which otherwise would result in thermochromic effects. 
  Reference    Z. Naturforsch. 43b, 952—958 (1988); eingegangen am 29. Februar 1988 
  Published    1988 
  Keywords    Tetramethyldiphosphane, Tetramethyldiarsane, Conformation, Molecular Structure, Crystal Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0952.pdf 
 Identifier    ZNB-1988-43b-0952 
 Volume    43 
17Author    Alexander Lichtblau, Hans-Dieter Hausen, Wolfgang KaimRequires cookie*
 Title    First Structural Characterization of an Easily Oxidized Derivative o f 1,4-Dihydroquinoxaline  
 Abstract    The first crystal structure analysis o f a 1,4-dihydroquinoxaline is described by example o f the l,4-bis(re/-/-butyldimethylsilyl) derivative. In the solid state, this molecule exhibits a non-planar heterocycle with a dihedral angle o f 156.3° along the N -N axis in the boat-shaped 87r electron ring system. The alkyl groups o f the Si(/er/-Bu)M e2 substituents are arranged as to minimize steric repulsion. Despite the reduced n electron conjugation due to non-planarity, the com pound is oxidized reversibly to an EPR detectable radical cation at -0 .5 9 V vs. ferro­ cene in dichloromethane. However, the second oxidation to the fully aromatic dication is elec-trochemically irreversible. A comparison with previously obtained results illustrates the struc­ tural flexibility o f the non-aromatic 1,4-dihydro-1,4-diazine ring system which is strongly affected by rather weak non-bonded interactions. 
  Reference    Z. Naturforsch. 48b, 713 (1993); eingegangen am 21. Dezember 1992 
  Published    1993 
  Keywords    Heterocycles, Organosilicon Compounds, Crystal Structure, Cyclic Voltammetry, Conformation 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0713.pdf 
 Identifier    ZNB-1993-48b-0713 
 Volume    48 
18Author    Steffen Runge, M. Athias, O. SengeRequires cookie*
 Title    Electron Donor-Acceptor Compounds. Synthesis and Structure of 5-(l,4-Benzoquinone-2-yl)-10,15,20-trialkylporphyrins  
 Abstract    A series of 5-(benzoquinone)-10,15,20-trialkylporphyrins was synthesized via cross conden­ sation of the respective aldehydes, 2,5-dimethoxybenzaldehyde and pyrrole followed by de-methylation with BBr3 and oxidation with P b 0 2. This method worked reasonably well for compounds bearing the benzoquinone substituent and butyl, isopropyl, 1 -methylpropyl and 2-ethylpropyl residues (2a-d). The free base porphyrin quinones were converted into the zinc(II) complexes (3a-d) all of which showed remarkable stability for porphyrin quinones. The zinc(II) complex 3c bearing isopropyl residues was investigated by X-ray crystallography and showed a supramolecular structure consisting of polymeric chains facilitated by coordina­ tion of a benzoquinone oxygen to a neighboring zinc(II) center. Attempts to synthesize a 5-(benzoquinone)-10,15,20-tris(terr-butylporphyrin) resulted in the formation of a yellow por-phomethene (4), which could not be oxidized further. A crystal structure analysis of 4, the first for a free base porphomethene, shows an extremely twisted conformation with syn-orientation of the three rm-butyl groups. The results indicate that new methods will have to be developed for the synthesis of nonplanar porphyrin quinones. 
  Reference    Z. Naturforsch. 53b, 1021—1030 (1998); received June 15 1998 
  Published    1998 
  Keywords    Porphyrins, Quinones, Electron Transfer Compounds, Crystal Structure, Conformation 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1021.pdf 
 Identifier    ZNB-1998-53b-1021 
 Volume    53 
19Author    Steffen Runge3, MathiasO. Senge3, Karin Ruhlandt-SengebRequires cookie*
 Title    5,10,15,20-Tetrakis(diphenylmethyl)porphyrin -A Nonplanar Porphyrin with Intermediate Degree of Ruffling  
 Abstract    The title compound was prepared by condensation of pyrrole and diphenylacetaldehyde in 16% yield. Based on spectroscopic data, the free base porphyrin exhibits a nonplanar macrocycle in solution with a degree of distortion between that of 5,10,15,20-tetracyclohexyl-porphyrin and 5,10,15,20-tetra(r-butyl)porphyrin. A crystal structure determination of the cobalt(II) complex reveals a ruffled macrocycle conformation with an average out-of-plane displacement of the m eso carbon atoms by 0.55 A. 
  Reference    Z. Naturforsch. 54b, 662 (1999); received February 17 1999 
  Published    1999 
  Keywords    Porphyrins, Steric Strain, Cobalt Porphyrins, Crystal Structure, Conformation 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0662.pdf 
 Identifier    ZNB-1999-54b-0662 
 Volume    54 
20Author    A. O., W.J SRequires cookie*
 Title    Axial Preference of Methylthio Substituent in Dioxaphosphorinanyl Ring System  
 Abstract    The spatial disposition of a 2-methvlthio group in the 4-m ethyl-1,3,2-dioxaphosphorin­ anyl ring system was studied by stereochemical correlation, X H, 13C and 31P NMR. It has been established that a CH3S-group prefers an axial orientation much more strongly than does a m ethoxy group. 
  Reference    (Z. Naturforsch. 30b, 430—436 [1975]; received February 4 1975) 
  Published    1975 
  Keywords    ) 2-Methylthio-l, 3, 2-dioxaphosphorinans, Synthesis, Spectral Characteristics, Conformation 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0430.pdf 
 Identifier    ZNB-1975-30b-0430 
 Volume    30