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  • 1985-1989  (13)
Collection
Publisher
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 135 (1986), S. 162-165 
    ISSN: 1615-6102
    Keywords: Alga ; Chlorella ; Ecology ; Virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A tail-less polygonal virus with a prominent capsid of about 140–150 nm in diameter and about 14–15 nm in thickness has been isolated from a freshwater pond. It shows a marked host specificity in attacking only an endosymbioticChlorella sp. isolated fromParamecium bursaria (Ciliata). Viral replication starts in the algal cytoplasm and both autospores and old cells are lysed. The ecology of the virus in the freshwater habitat is discussed. Screening tests for further phycoviruses were not successful.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Silane des Typs R1R2Si(H)CH2OE10xR y 3 mit R=organyl; E1=C (x=y=1), S(x=2, y=1) oder P (x=1,y=2) zeigen eine thermisch induzierte Umlagerung zu Silanen des Typs R1R2Si(CH3)OE10xR y 3 . Energetische (Reaktionsenthalpie) und kinetische Daten (Reaktionsordnung, Aktivierungsenthalpie und -entropie) dieser Umlagerungsreaktion wurden mittels DSC ermittelt. Die mechanistischen Aspekte der Ergebnisse werden diskutiert.
    Abstract: РЕжУМЕ сИлАНы тИпА R1R2Si(H)OE1(O)xR y 3 , гДЕ R=ОРгАНИЧЕскИИ РАДИкАл, E1=C (x=y=1), S (x=2,y=1), P (x=1,y=2), пОДВЕРгАУтсь т ЕРМИЧЕскИ НАВЕДЕННОМУ пРЕВРАЩ ЕНИУ с ОБРАжОВАНИЕМ сИлАНОВ тИпА R1R2Si(CH3)OE1(O)xR y 3 . с п ОМОЩьУ Дск БылИ ОпРЕДЕлЕНы ЁНЕРгЕтИ ЧЕскИЕ (ЁНтАльпИь РЕАкцИИ) И кИНЕтИЧЕск ИЕ пАРАМЕтРы (пОРьДОк РЕАкцИИ, ЁНтАльпИь И ЁНтРОпИь АктИВАцИИ) ЁтОИ РЕАкцИИ. пОлУЧЕН НыЕ РЕжУльтАты ОБсУж ДЕНы НА ОсНОВЕ МЕхАНИстИЧЕс кИх пРЕДстАВлЕНИИ.
    Notes: Abstract Silanes of the type R1R2Si(H)CH2OEl(O)xR y 3 [R=organyl; El=C (x=y=1), S (x=2,y=1), P (x=1y=2)] undergo a thermally induced rearrangement to give silanes of the type R1R2Si (CH3)OEl(O)xR y 3 . The energetic (reaction enthalpy) and kinetic data (reaction order, enthalpy and entropy of activation) of this reaction were determined by means of differential scanning calorimetry. The results obtained are discussed in terms of mechanistic aspects.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 562 (1988), S. 17-22 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of 1,3-Dimethyl-1,1,3,3-tetraphenyldisiloxane1,3-Dimethyl-1,1,3,3-tetraphenyldisiloxane 1 crystallizes monoclinically (P21/n; a = 2237.5; b = 801.4; c = 1396.6 pm, β = 106.29°; Z = 4). The X-ray structural analysis shows a bent configuration of the molecule with Si—O—Si angle = 140°, d(Si—O) = 163.8 pm. The staggered conformation of the six Si—C bonds is distorted. The methyl groups are in gauche position.The results are discussed with respect to an intramolecular H…O interaction in the structure of 1,1,3,3-tetraphenyldisiloxane.
    Notes: 1,3-Dimethyl-1,1,3,3-tetraphenyldisiloxan 1 kristallisiert monoklin (P21/n; a = 2237,5; b = 801,4; c = 1396,6 pm; β = 106,29°; Z = 4). Die Kristallstrukturanalyse ergab eine gewinkelte Konfiguration des Moleküls mit Si—O—Si = 140° und d(Si—O) = 163,8 pm. Die Substituenten an dem Silicium-Atom zeigen eine Abweichung von einer gestaffelten Anordnung der sechs Si—C-Bindungen. Die Methylgruppen sind in gauche-Position.Die Ergebnisse werden im Zusammenhang mit der Struktur des 1,1,3,3-Tetraphenyldisiloxans hinsichtlich einer intramolekularen H…O-Wechselwirkung diskutiert.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 563 (1988), S. 48-52 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Silicon-Sulphur Compounds. 53. Structure of 1,3-Dimethyl-1,1,3,3-tetraphenyldisilthiane1,3-Dimethyl-1,1,3,3-tetraphenyldisilthiane was obtained by an insertion reaction of sulphur with Ph2 MeSiH. The compound crystallizes triclinically (P1; a = 1166.7; b = 1231.1; c = 988.6 pm; α = 113.23; β = 90.34; γ = 112.43°; Z = 2). The X-ray structure analysis shows a bent configuration of the molecule with Si—S—Si = 108.7°. The results are discussed together with the structures of hexaphenyldisilthiane and dimethyltetraphenyldisiloxane.
    Notes: 1,3-Dimethyl-1,1,3,3-tetraphenyldisilthian entsteht aus Schwefel und Ph2MeSiH in einer Einschub-Reaktion. Die Verbindung kristallisiert triklin (P1; a = 1166,7; b = 1231,1; c = 988,6 pm; α = 113,23; β = 90,34; γ = 112,43°; Z = 2). Die Kristallstruktur-analyse ergab eine gewinkelte Konfiguration des Moleküls mit Si—S—Si = 180,7°. Die Ergebnisse werden im Zusammenhang mit der Struktur des Hexaphenyldisilthians und Dimethyltetraphenyl disiloxans diskutiert.
    Additional Material: 2 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Acyl- and Alkylidenearsines. VI. Comparative Studies on the Structures of Bis(2,2-di-methylpropionyl)phenylarsine and -phosphine.Bis(2,2-dimethylpropionyl)phenylarsine 1a [19] and -phosphine 1b [20] prepared from the corresponding bis(trimethylsilyl) derivative and 2,2-dimethylpropionyl chloride, crystallize in the monoclinic space group P21/c with following dimensions of the unit cell determined at a temperature of measurement of -70 ± 3°C/-73 ± 3°C: a = 1449.3(7)/1468.3(3); b = 1050.0(5)/985.9(2); c = 1138.5(4)/1159.4(4) pm; β = 108.27(3)/105.61(3)°; Z = 4. X-ray structure determinations (Rw = 0.044/0.044) reveal distances of 205 and 191 pm between the pnicogen and the carbon atom of the carbonyl group which, as in similar trifluoromethyl compounds [2], are definitely elongated with respect to standard values of 194 and 183 pm. Further characteristic mean bond lengths and angles are: As—C(phenyl) 194; P—C(phenyl) 184; C=O 119/121; C(O)—C 153/154; C(O)—As—C(O) 91; C(O)—P—C(O) 95; As—C—O 120; P—C—O 120; As—C(O)—C 117 and P—C(O)—C 118°.
    Notes: Die aus den entsprechenden Bis(trimethylsilyl)-Derivaten und 2,2-Dimethylpropionylchlorid zugänglichen Verbindungen Bis(2,2-dimethylpropionyl)phenylarsan 1a [19] und -phosphan 1b [20] kristallisieren monoklin in der Raumgruppe P21/c mit den bei einer Meßtemperatur von -70 ± 3°C/ -73 ± 3°C bestimmten Abmessungen der Elementarzelle: a = 1449,3(7)/1468,3(3); b = 1050,0(5)/985,9(2); c = 1138,5(4)/1159,4(4) pm; β = 108,27(3)/105;61(3)°; Z = 4. Nach den Ergebnissen von Röntgenstrukturanalysen (Rw = 0,044/0,044) weisen sowohl das Arsan 1a als auch das Phosphan 1b Abstände zwischen Pnikogen- und Carbonylkohlen-stoffatom auf, die mit Mittelwerten von 205 und 191 pm wie in den Trifluormethyl-Verbindungen [2] gegenüber dem Standard (194 bzw. 183 pm) eindeutig verlängert sind. Weitere charakteristische mittlere Bindungslängen und -winkel sind: As—C(Phenyl) 194; P—C(Phenyl) 184; C=O 119/121; C(O)—C 153/154 pm; C(O)—As—C(O) 91; C(O)—P—C(O) 95; As—C—O 120; As—C(O)—C 117 und P—C(O)—C 118°.
    Additional Material: 4 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Silicon-Sulfur Compounds. 50. Bis(triorganoxysilyl)-polysulfides and the Structure of Bis(tri-tert-butoxysilyl)disulfideDisilylated polysulfides (RO)3SiSnSi(OR)3, R = i-Pr, tert-Bu, 2,6-Me2C6H3, n = 2-5, were obtained by reaction of (RO)3SiSNa with I2 or SnCl2, respectively. The reaction of [(t-BuO)3Si]2S2 with Ph3SiH yielded the mixed sulfide (t-BuO)3SiSSiPh3 and with Ph3P or Bu3P, by extrusion of one sulfur atom, the [(t-BuO)3Si]2S. The X-ray crystal structure of [(t-BuO)3Si]2S2 was determined. The S—S bond length is 209,2 pm, Si—S 213,2 pm. The mean value of the Si—S—S angle is 100,7°, and the torsion angle Si—S—S—Si -127,6°.
    Notes: Disilylierte Polysulfide (RO)3SiSnSi(OR)3, R = i-Pr, t-Bu, 2,6-Me2C6H3, n = 2-5, wurden durch Reaktion von (RO)3SiSNa mit I2 bzw. SnCl2 dargestellt. Die Umsetzung von [(t-BuO)3Si]2S2 mit Ph3SiH liefert ein gemischtes Sulfid (t-BuO)3SiSSiPh3 und mit Ph3P oder Bu3P, durch Abbau eines S-Atoms, [(t-BuO)3Si]2S. Die Kristall-Struktur von [(t-BuO)3Si]2S2 wurde bestimmt. Die S—S-Bindungslänge beträgt 209,2 pm, Si—S 213,2 pm. Der Mittelwert für den Si—S—S-Winkel beträgt 100,7°, der Torsionswinkel Si—S—S—Si -127,6°.
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 563 (1988), S. 53-58 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of PentaphenyldisiloxanePentaphenyldisiloxane was obtained by reaction of triphenylsilanol with diphenylchlorosilane and triethylamine. The compound crystallizes as colourless triclinic platelets (P1; a = 1069.6; b = 1389.6; c = 925.5 pm; α = 106.17; β = 9239; γ = 95.93°; Z = 2). The X-ray structure analysis shows a bent configuration of the molecule with Si—;O—Si = 163.3°. The structure of the molecules is discussed in relation to the structures of 1,1,3,3-tetraphenyldisiloxane, 1,3-dimethyl-1,1,3,3-tetraphenyldisiloxane and pentaphenylmethyldisiloxane.
    Notes: Pentaphenyldisiloxan wurde bei der Umsetzung von Triphenylsilanol mit Diphenylchlorsilan und Triethylamin erhalten. Die Verbindung kristallisiert triklin in Form farbloser Plättchen (P1; a = 1069,6; b = 1389,6; c = 925,5 pm; α = 106,17; β = 92,39; γ = 95,93°; Z = 2). Die Kristallstrukturanalyse ergab eine gewinkelte Konfiguration des Moleküls mit Si—O—;Si = 163,3°. Die Molekülstruktur wird im Zusammenhang mit der Struktur von 1,1,3,3-Tetraphenyldisiloxan, 1,3-Dimethyl-1,1,3,3-tetraphenyldisiloxan und Pentaphenylmethyldisiloxan diskutiert.
    Additional Material: 3 Ill.
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  • 8
    Publication Date: 1985-07-01
    Print ISSN: 0168-583X
    Electronic ISSN: 1872-9584
    Topics: Physics
    Published by Elsevier
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  • 9
    Publication Date: 1988-01-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 10
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