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  • 1
    Electronic Resource
    Electronic Resource
    π-Complexes of p-block elements: (η6-Mesitylene)tin(II) chloride tetrachloroaluminate(III), a coordination polymer (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 1 (1990), S. 161-165 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (η6-1,3,5-Trimethylbenzene)tin(II) chloride tetrachloroaluminate(III), (η6-1,3,5-C6H3Me3)SnCl (AlCl4), has been obtained from the reaction of anhydrous SnCl2 and AlCl3 in the molar ratio 1 : 2 in excess mesitylene as a solvent. The compound crystallizes in monoclinic needles, space group P21/n, containing a coordination polymer with planar four-membered rings Sn-Cl-Sn-Cl as the fundamental structural units. Each tin(II) atom of these rings is η6-bonded to a mesitylene ring, with the metal approximately centered over the aromatic hydrocarbon at a distance of 2.71 Å. Each of the tin(II) atoms is further connected to two tetrachloroaluminate counter ions, one of these monodentate and one bidentate. Through this mono/bidentate contacts a one-dimensional coordination polymer is generated with crystallographic centers of inversion in the middle of the Sn(Cl)2Sn and Sn(AlCl4)2Sn rings. The structure is similar to that of the analogous benzene complex, but not identical owing to a different connectivity pattern. Also, the arene-Sn(II) distance is much shorter in the mesitylene complex (2.71 Å) than in the benzene complex (2.90 Å), indicating that the trimethylbenzene molecule is a much better donor than benzene.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520010207
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  • 2
    Electronic Resource
    Electronic Resource
    The Structural Chemistry of Aziridino- and Azetidinosilanes (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 107-112 
    Details
    ISSN: 1434-1948
    Keywords: Silicon ; Aminosilanes ; Aziridine ; Azetidine ; Molecular conformation ; Configuration determination ; Nitrogen ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a continuation of structural investigations of poly(amino)silanes, a series of silicon derivatives of aziridine and azetidine have been prepared. Analogies with the isoelectronic phosphorus ylide species and the high barrier to inversion at nitrogen in small N heterocycles were suggestive of steeply pyramidal and rather rigid configurations at the N atoms in the title compounds. Tetrakis(N-aziridino)silane (1) and tetrakis(N-azetidino)silane (2) have been synthesized from SiCl4 and LiN(CH2)x (x = 2, 3). Compound 1 is also formed when LiN(CH2)2 and HSiCl3 are used as starting materials, but with free aziridine a non-volatile product (1a) is obtained. In neither case could any trace of HSi[N(CH2)2]3 be detected. In contrast, RSiCl3 (R = Me, Ph) could readily be converted into the corresponding tris(N-aziridino)silanes (3, 4) by treatment with excess aziridine. Tris(N-azetidino)silane (5) was accessible from HSiCl3 and excess azetidine, but the product was found to contain an unknown impurity. In order to determine the local symmetry and the dynamics of the aziridine rings, 1H-NMR spectra were recorded at low temperature (-80°C). No splitting of the signals was observed, indicating that the inversion barriers are extremely low, even in the highly strained three-membered heterocycles. Nevertheless, single-crystal X-ray diffraction studies of the N-triphenylsilyl derivatives of aziridine (6) and azetidine (7) revealed an aziridinyl group with a steeply pyramidal configuration at nitrogen in 6 (sum of the angles at N 313.32°), and an azetidinyl group with a flat geometry in 7 (sum of the angles at N 350.96°). The Si-N bond is significantly shorter in 7 as compared to that in 6.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Contributions to the Coordination and Structural Chemistry of Gallium(III) and Indium(III) Halides: Complexes with Bi- and Tridentate Tertiary Phosphanes (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 203-210 
    Details
    ISSN: 1434-1948
    Keywords: Gallium(III) halides ; Indium(III) halides ; Phosphanes, polydentate ; Complexes ; Crystallography ; Lewis acid catalysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of gallium and indium trihalides with 1,2-bis(diphenylphosphanyl)benzene (DP) and bis[(2-diphenylphosphanyl)phenyl]phenylphosphane (TP) lead to a variety of molecular and ionic complexes. Treatment of InCl3 with DP results in [(DP)2InCl2]+[InCl4]- (1). With InBr3 or InI3 molecular 1:1 complexes (DP)InX3 (2: X = Br, 3: X = I) and ionic 1:2 complexes [(DP)InX2]+[InX4]- (4: X = Br, 5: X = I) are obtained. With GaBr3 and GaI3 only the ionic complexes [(DP)GaX2]+[GaX4]- (6: X = Br, 7: X = I) are generated. According to single-crystal X-ray analyses the environment of the metal center is octahedral in the cation of 1, square pyramidal in 3, and tetrahedral in the cations of 5 and 7. The reactions of TP with GaI3 or InI3 afford ionic complexes [(TP)MI2]+[MI4]- (8: M = Ga, 9: M = In). As shown by 31P-NMR studies and X-ray analyses, TP acts as a bidentate ligand in both complexes. The central phosphorus atom is not engaged in coordinative bonding. The 31P resonances of all compounds appear at higher field as compared to the free ligand. This phenomenon calls for further investigations and a detailed theoretical treatment.
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  • 4
    Electronic Resource
    Electronic Resource
    Gold-Komplexe von Diphosphinomethanen, IV. AuI-Verbindungen von Diphosphinoaminen und oxidative Addition von Chlor zu AuII- und AuIII-Komplexen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 496-500 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gold Complexes of Diphosphinomethanes, IV. Au1 Compounds of Diphosphinoamines and Oxidative Addition of Chlorine Yielding AuII and AuIII ComplexesBis(diphenylphosphino)amine (DPA) reacts with two equivalents of ClAu(CO) to form a binuclear gold complex HN[P(C6H5)2AuCl]2 (1). The analogous methylamine derivative (2) is prepared more easily from the ligand bis(diphenylphosphino)methylamine (DPMA) and HAuCl4 in ethanol. Excess DPMA. in the same solvent, yields a cyclic 1:1 complex 3 which is electrolytically dissociated in acetonitrile. 2 can be oxidized using stoichiometric amounts of chlorine to form complexes with the formal oxidation states +2 (5) and +3 (6) of gold. l97Au Mößbauer spectra prove that 5 is indeed not a mixed Au1/AuIII compound but contains the structural moiety Au24⊕.  -  DPA can be metallated at the nitrogen with n-C4H9Li and transformed into [(C6H5)2P]2NSI(CH3)3 using (CH3)3SiCi, but no gold complex was obtained from this ligand.
    Notes: Bis(diphenylphosphino)amin (DPA) reagiert mit zwei Äquivalenten ClAu(CO) zum zweikernigen Goldkomplex HN[P(C6H5)2AuCl]2 (1). Das analoge Methylaminderivat (2) kann leichter aus dem Liganden Bis(diphenylphosphino)methylamin (DPMA) und HAuCl4 in Ethanol erhalten werden. Überschüssiges DPMA ergibt im gleichen Solvens den cyclischen 1 : 1-Komplex 3, der in Acetonitril elektrolytisch dissoziiert. 2 kann mit stöchiometrischen Mengen Chlor in Komplexe übergeführt werden, in denen Gold formal die Oxidationsstufen +2 (5) und +3 (6) besitzt. 197Au-Mößbauer-Spektren beweisen, daß 5 tatsächlich keine gemischte AuI/AuIII 1-Verbindung ist, sondern das Strukturelement Au24⊕ enthalten muß.  -  DPA kann mit n-C4H9Li am Stickstoff metalliert und mit (CH3)3SiCl in den Liganden [(C6H5)2P]2NSi(CH3)3 verwandelt werden, von dem jedoch noch kein Goldkomplex zu erhalten war.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120212
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  • 5
    Electronic Resource
    Electronic Resource
    Oxiran- und Oxetanspaltung mit Phosphor-Yliden: Ein Weg zu mono- und spirobicyclischen Phosphoranen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 501-509 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxirane and Oxetane Cleavage with Phosphorus Ylides: A Pathway to Fluctuating Mono- and Spirobicyclic Phosphoranes1-Methyl-1-methylen-1 λ5-phospholane (1) and -phosphorinane (3) react with oxirane under mild conditions to form the spirobicyclic phosphoranes 2 and 4, resp., in high yields. Oxetane converts the same ylides into the corresponding heterocycles 6 and 7 only at elevated temperatures and under autogenic pressure in sealed tubes. Similarly, trimethylmethylenephosphorane inserts into oxetane with formation of the monocyclic 2,2,2-trimethyl-1,2λ5-oxaphosphorinane (5).  -  A detailed variable temperature NMR study leads to trigonal bipyramidal ground state geometries of the phosphoranes 2 and 4-7. Their fluctuating behaviour, for which any irregular process could be excluded, is most easily described by the turnstile model of pseudorotation. The compounds reported appear to be the most simple cyclic systems of the type R4POR′ available to date.
    Notes: 1-Methyl-1-methylen-1λ5-phospholan (1) und -phosphorinan (3) reagieren schon unter milden Bedingungen mit Oxiran in guten Ausbeuten zu den spirobicyclischen Phosphoranen 2 bzw. 4. Oxetan verwandelt die gleichen Ylide in die entsprechenden Heterocyclen 6 und 7, jedoch erst bei höherer Temperatur und unter Eigendruck im Bombenrohr. Trimethylmethylenphosphoran wird in ähnlicher Weise in den Oxetanring eingeschoben, wobei das monocyclische 2,2,2-Tri-methyl-1,2Δ5-oxaphosphorinan(5)entsteht.  -  Ein detailliertes Studium der temperaturabhängigen NMR-Spektren führte zu einer trigonal-bipyramidalen Grundzustandsgeometrie der neuen Phosphorane 2 und 4-7. Deren fluktuierendes Verhalten, für das irreguläre Prozesse ausgeschlossen werden konnten, ist am leichtesten unter Zuhilfenahme des Turnstile-Modells zu beschreiben.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120213
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  • 6
    Electronic Resource
    Electronic Resource
    Synthese und Struktur kristallisierter natriumorganischer Verbindungen aus Phosphor-Yliden (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 902-911 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of Crystalline Sodiumorganic Compounds from Phosphorus YlidesThe two ylides (C6H5)2P - CH = P(C6H5)2 - CH2C6H5 (4) and C6H5CH2(C6H5)2P = CH - P(C6H5)2 = CHC6H5 (5) are synthesized from (C6H5)2P - CH2 - P(C6H5)2 (1) via their corresponding benzylphosphonium salts 2 und 3. The double ylide 5 exists solely in the above conjugated form, in contrast to most other R3PCPR3 molecules, where the cumulated isomer is preferred. There is rapid proton scrambling between benzyl and benzylidene hydrogens as detected by NMR spectroscopy. 4 and 5 react with NaNH2 to form coloured sodium complexes, in which the metal is bonded via the benzylide functions. NMR spectra indicate a symmetrical coordination site for Na+ above the benzylidene ring. The coordination sphere is completed by ether and/or tetrahydrofurane molecules. In an X-ray structure analysis of 6, which crystallizes with one (C2H5)2O and one C4H8O molecule, the details of the structure were elucidated. A 23Na NMR spectrum confirms the extremely asymmetrical array of ligands at the metal center. In the e.i. mass spectrum the sodium-containing molecular ion is observed.
    Notes: Aus (C6H5)2P — CH2 — P(C6H5)2 (1) werden über die zugehörigen Benzylphosphoniumsalze 2 und 3 die beiden Ylide (C6H5)2P — CH = P(C6H5)2 — CH2C6H5 (4) und C6H5CH2(C6H5)2P = CH — P(C6H5)2 = CHC6H5 (5) synthetisiert. Letzteres existiert im Gegensatz zu anderen R3PCPR3-Molekülen ausschließlich als konjugiertes Doppel-Ylid und zeigt raschen Protonenaustausch zwischen Benzyl-und Benzylidengruppe. 4 und 5 reagieren mit NaNH2 zu tieffarbigen Natriumkomplexen, in denen das Metall über die Benzylidfunktionen gebunden ist. NMR-Spektren zeigen eine symmetrische Bindung des Metalls an den Benzylidenring an. Die Koordinationssphäre des Na+ wird durch Ether- und/oder Tetrahydrofuranmoleküle ergänzt. Eine Röntgenstrukturanalyse von 6, das aus Ether mit je 1 Molekül Ether und Tetrahydrofuran kristallisiert, klärte Details der Bindungsverhältnisse in diesen neuen natriumorganischen Verbindungen. Das 23Na-NMR-Spektrum bestätigt die außerordentlich unsymmetrische Umgebung des Metalls. Im Massenspektrum wird das natriumhaltige Molekül-Ion beobachtet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130310
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  • 7
    Electronic Resource
    Electronic Resource
    Silylierte Pentaalkylverbindungen und Ylide des Antimons (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 2702-2707 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Silylated Pentaalkyls and Ylides of AntimonyThe five pentaalkylstiboranes (CH3)nSb[CH2Si(CH3)3]5-n (n = 0,1,2,3,4) are obtained by methylation or trimethylsilylmethylation of the corresponding alkylantimony halides. Their thermal decomposition leads to trialkylstibines, probably via an ylidic intermediate. From 1 (n = 0) and HCl the covalent [(CH3)3SiCH2]4SbCl (8) is synthesized, which on dehydrohalogenation is transformed into an unstable ylide 7. The latter can be isomerized thermally to the more stable ylide 10. From (CH3)3Sb and (CH3)3SiCH2I the stibonium salt [(CH3)3SbCH2Si(CH3)3]I (9) is formed, which upon transylidation with (C2H5)3P = CHCH3 yields no defined product.
    Notes: Durch Methylierung oder Trimethylsilylmethylierung entsprechender Alkylantimonhalogenide werden die fünf Pentaalkylstiborane (CH3)nSb[CH2Si(CH3)3]5-n (n = 0,1,2,3,4) erhalten. Ihre thermische Zersetzung führt, wahrscheinlich über eine ylidische Zwischenstufe, zu Trialkylstibinen. Aus 1 (n = 0) entsteht mit HCl das kovalent gebaute [(CH3)3SiCH2]4SbCl (8), das bei Dehydrohalogenierung in ein instabiles Ylid 7 übergeht. Letzteres kann thermisch in ein beständigeres Isomeres 10 umgelagert werden. Aus (CH3)3Sb und (CH3)3SiCH2I entsteht das Stiboniumsalz [(CH3)3SbCH2Si(CH3)3]I (9), das bei der Umylidierung mit (C2H5)3P = CHCH3 kein definiertes Produkt ergibt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110725
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  • 8
    Electronic Resource
    Electronic Resource
    Doppel-Yilde, VII1) Synthese, Eigenschaften und Strukturbestimmung der Boranato-bis(dimethylphosphoniummethylid)-Komplexe des Nickels, Palladiums und Platins (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 3302-3310 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Double Ylides, VII1) Synthesis, Properties, and Structure Determination of the Boranato-bis(dimethylphosphonium methylide) Complexes of Nickel, Palladium, and Platinum[(CH3)3P]2BH2+ Br- has been metalled with two equivalents of C4H9Li and treated in situ with l/2 equivalent of [(CH3)3P]2MC12, M = Ni, Pd, Pt, to form the title complexes 1-3. These products are novel homoleptic organometallic compounds of the composition H2B[(CH3)2PCH2]2M[CH2P(CH3)2]2BH2. They were characterized by chemical analysis, infrared, mass, and 1H,11B, 13C, 31 P NMR spectroscopic data. The crystal and molecular structure of the nickel compound 1 was elucidated by a single crystal X-ray diffraction study. It was found to be centro-symmetric, having a square-planar array of CH2-carbon atoms around the metal centre, and a chair conformation for both six-membered chelate rings. The four PB bonds are equidistant, as are the four NiC and PC bonds.
    Notes: [(CH3)3P]2BH2+Br- wurde mit zwei Äquivalenten C4H9Li metalliert und in situ mit einem halben Äquivalent eines [(CH3)3P]2MCI2-Komplexes (M = Ni, Pd, Pt) weiter umgesetzt, wobei die Titelverbindungen 1-3 erhalten werden. Diese neuartigen homoleptischen metallorganischen Verbindungen haben die Zusammensetzung H2B[(CH3)2PCH2]2M[CH2P(CH3)2]2BH2. Sie wurden durch chemische Analyse und infrarot-, massen- und 1H-, 11B-, 13C- sowie 31P-NMR-spektroskopische Daten charakterisiert. Die Kristall- und Molekülstruktur der Nickelverbindung 1 wurde durch eine Röntgenbeugungsanalyse gelöst. Die Moleküle sind centrosymmetrisch und besitzen eine quadratisch-planare Anordnung von CH2-Kohlenstoffatomen um das Metallatom. Die beiden sechsgliedrigen Chelatringe haben Sesselkonformation und sowohl die vier PB- als auch die vier PC- und NiC-Bindungen sind äquidistant.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791121003
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and a crystal structure analysis of mixed bis(phosphino)methanide/phosphonium bis(methylide) complexes of nickel, palladium, and platinum (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 1145-1152 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und eine Kristallstrukturanalyse von gemischten Bis(phosphino)methanid/Phosphonium-bis(methylid)-Komplexen des Nickels, Palladiums und PlatinsAus den Bis(diphenylphosphino)methanid-Komplexen des Typs {[(C6H5)2P]2CH}2M (M = Ni, Pd, Pt) und der äquivalenten Menge eines Ylids R2(CH3)P = CH2 (R = CH3, C2H5) wurden die drei Titelverbindungen {[(C6H5)2P]2CH}M[(CH2)2PR2] (5a - c) erhalten. Eine Röntgenbeugungsanalyse der Platinverbindung 5c ergab eine gemischte Chelatstruktur mit einem ebenen Bis(phosphino)methanid- und einem gefalteten Ylidring. Das mittlere C-Atom des Bis(phosphino)methanids unterhält keine direkten Kontakte zum Metall. Seine Abstände zu den P-Atomen deuten erheblichen Doppelbindungscharakter an. Ylidischer Doppelbindungscharakter wird auch in der Phosphonium-bis(methylid)-Gruppe beibehalten.
    Notes: From bis(diphenylphosphino)methanide complexes of the type {[(C6H5)2P]2CH}2M (M = Ni, Pd, Pt), and an equivalent amount of an ylide R2(CH3)P = CH2 (R = CH3, C2H5), the three title complexes {[(C6H5)2P]2CH}M[(CH2)2PR2] (5a - c) have been prepared. CH2[P(C6H5)2]2 is the by-product of the reaction. An X-ray diffraction study of the platinum compound 5c revealed a mixed chelate structure with a planar bis(phosphino)methanide and a folded ylide ring. The central carbon of the bis(phosphino)methanide is not in close contact with the metal. Its distances to the phosphorus atoms indicate significant double bond character, some of which is also retained in the phosphonium bis(methylide) group.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130335
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  • 10
    Electronic Resource
    Electronic Resource
    Cyclische μ-(4-Methylcyclohexadien-1-ylidenio)-bis[phosphangold(I)]-Kationen (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 1646-1653 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic μ-(4-Methylcyclohexadien-1-ylidenio)-bis[phosphanegold(I)] CationsArylation of α, ω-bis[(chloroaurio)diphenylphosphino]alkanes 1b - d using p-tolyllithium yields the binuclear tolylgold compounds [(p-CH3C6H4Au)P(C6H5)2]2[CH2]n with n = 2, 3, and 4 (2b - d). p-CH3C6H4AuP(CH3)3 was obtained similarly as an NMR reference compound. 2d is converted into the cation p-CH3C6H4[AuP(C6H5)2(CH2)2]2+ BF4- on treatment with HBF4 in diethyl ether, with elimination of toluene. The product is ascribed the cyclic structure 3d, based on NMR and 197Au Mößbauer data.
    Notes: Aus den α, ω-Bis[(chloroaurio)diphenylphosphino]alkanen 1b - d wurden durch Arylierung mit p-Tolyllithium die zweikernigen Tolylgoldverbindungen [(p-CH3C6H4Au)P(C6H5)2]2[CH2]n mit n = 2, 3 und 4 (2b - d) synthetisiert. Zusätzlich wurde p-CH3C6H4AuP(CH3)3 als NMR-Vergleichssubstanz hergestellt. 2d liefert bei der Behandlung mit etherischem HBF4 unter Abspaltung von Toluol das Kation p-CH3C6H4[AuP(C6H5)2(CH2)2]2+ BF4-, dem aufgrund der NMR-und 197Au-Mößbauer-Spektren die cyclische Struktur 3d zugeschrieben wird.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130503
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