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  • Articles  (74)
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  • Chemistry  (69)
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  • Articles  (74)
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  • 1
    Electronic Resource
    Electronic Resource
    Energetic composition, biomass, and chemical defense in the common antarctic nemertean Parborlasia corrugatus McIntosh
    Amsterdam : Elsevier
    Journal of Experimental Marine Biology and Ecology 153 (1991), S. 15-25 
    Details
    ISSN: 0022-0981
    Keywords: Antarctica ; Biochemical composition ; Energetics ; Nemertean ; Toxicity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-0981(05)80003-6
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  • 2
    Electronic Resource
    Electronic Resource
    Chemotactic tube-foot responses of a spongivorous sea starPerknaster fuscus to organic extracts from antarctic sponges (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 859-870 
    Details
    ISSN: 1573-1561
    Keywords: Antarctica ; sponge ; sea star ; Perknaster fuscus ; chemotactic ; repellent ; chemical defense ; polar ; marine benthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Hexane, chloroform, and methanol extracts of 18 species of antarctic sponges were tested for their ability to induce sustained tube-foot retraction in the antarctic spongivorous sea starPerknaster fuscus. Extracts were imbedded in silicone and used to coat the tip of a glass rod, which was allowed to contact an extended tube-foot. Retraction times were measured and compared with three controls: contact with a glass rod coated with a hexane extract of fish (feeding stimulant), contact with the glass rod alone (mechanical control), and contact with the glass rod coated with silicone alone (silicone control). Only extracts of the spongeMycale acerata did not elicit significantly longer tube-foot retraction times than controls for at least one of the three organic extracts. Hexane sponge extracts elicited the lowest levels of significant tube-foot responses, with only 39% of the sponge species tested showing activity in this fraction. In contrast, chloroform and methanol extracts elicited a significant tube-foot retraction response in 73% and 78% of the species tested, respectively. This indicates that in this assay repellent metabolites are generally more polar substances. It remains to be determined that secondary metabolites are responsible for all of the tube-foot retraction responses detected in sea stars exposed to sponge extracts; bioactive secondary metabolites have been isolated from a number of these antarctic sponges. It may be of ecological significance that the two rapidly growing sponges,Homaxinella balfourensis andMycale acerata, were either not repellent or had low repellency, and thatM. acerata is the primary dietary item ofPerknaster fuscus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059583
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  • 3
    Electronic Resource
    Electronic Resource
    Carbon fibre reinforced bismaleimide composites, I (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 160 (1988), S. 17-28 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß der Zugabe von Bis(allylphenyl) Typ (TM 120)-Monomeren auf die Eigenschaften von unidirektional mit Carbonfasern verstärkten 4,4′-Bismaleimidodiphenylmethan (BM) - 2,4-Tolylendiamin (A) (1:0,3 Molverhältnis) (BM-A)-Verbundkörpern wird vorgestellt. Das Aushärteverhalten sowie das thermische Verhalten in Luft wurde mit Hilfe der Differentialkalorimetrie (DSC) und der Thermogravimetrie (TGA) untersucht. Die thermische Stabilität nimmt mit ansteigenden Konzentrationen von TM 120 deutlich zu. Demgegenüber steht ein Anstieg der Biegefesigkeit, der interlaminaren Scherfestigkeit sowie der Schlagzähigkeit mit zunehmender Monomerkonzentration. Optimale mechanische Eigenschaften wurden bei etwa 20 Tle./100 Tle. TM 120 erreicht.
    Notes: The paper deals with the effect of addition of bis(allylphenyl) type (TM 120) monomer on the properties of unidirectionally carbon fibre reinforced 4,4′ bismaleimidodi-phenyl methane (BM) - 2,4-tolylene diamine (A) (1:0.3 molar ratio) (BM-A) composites. The curing and thermal behaviour of the blends was investigated by using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) in air atmosphere. A marginal decrease in thermal stability was observed with increasing concentration of TM 120. Flexural, interlaminar, and impact strength of the laminates increased in the presence of this monomer. Optimum mechanical properties were observed at ∼ 20 phr of TM 120.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051600102
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  • 4
    Electronic Resource
    Electronic Resource
    N.N-Disubstituierte 2-Amino-cyclobutanone aus 2-Hydroxy-cyclobutanonen und sekundären Aminen (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 975-981 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N.N-Disubstituted 2-Aminocyclobutanones from 2-Hydroxycyclobutanones and Secondary AminesN.N-Disubstituted 2-aminocyclobutanones (7) are readily formed under mild conditions by reaction of 2-aminocyclobutanones (7) are readily formed under mild conditions by reaction of 2-hydroxycyclobutanone (6) with secondary amines in solution at room temperature. Optimum yields are obtained when 6 - prepared by hydrolysis of 1.2-bis(trimethylsiloxy)cyclobut-1-ene (8) - reacts in situ. By this method derivatives of 7 as well as higher homologous 2-aminocycloalkanones are also easily prepared.
    Notes: 2-Hydroxy-cyclobutanon (6) reagiert bei 20° in Lösung glatt mit sekundären Aminen zu den N.N-disubstituierten 2-Amino-cyclobutanonen (7). Optimale Ausbeuten an 7 lassen sich erzielen, wenn 6 in situ - dargestellt durch Hydrolyse des 1.2-Bis-trimethylsiloxy-cyclo-butens-(1) (8) - umgesetzt wird. Auf diese Weise sind auch Derivate von 7 sowie höherhomologe 2-Amino-cycloalkanone leicht erhältlich.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050328
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  • 5
    Electronic Resource
    Electronic Resource
    Ethylidenphosphoran-Ethenylfluorphosphoran-(λ5σ4P-λ5σ5P)-Umlagerung (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1445-1446 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ethylidenephosphorane - Ethenylfluorophosphorane (2λ5σ4P-λ5σ5P) Rearrangement2-Methoxy-1,3,2-dioxaphospholane (4) reacts with 2,2,4,4-tetrakis(trifluoromethyl)-1,3-dithietane (1) to furnish 2-methoxy-2-[2,2,2,-trifluoro-1-(trifluoromethyl)ethylidene]-1,3,2λ 5σ5-dioxaphospholane (6) which rearranges upon standing at ambient temperature to form 2-[2,2-difluoro-1-(trifluoromethyl)ethenyl]-2-fluoro-2-methoxy-1,3,2λ5σ5-dioxaphospholane (7).
    Notes: No Abstract
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200825
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  • 6
    Electronic Resource
    Electronic Resource
    Abfangreaktionen für unbeständige [1-Chlor-2,2,2-trifluor-1-(trifluormethyl)ethyl]dialkylphosphite (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 379-381 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trapping Reactions for Unstable [1-Chloro-2,2,2-trifluoro-1-(trifluoromethyl)ethyl] Dialkyl PhosphitesThe reaction of ClP(OR)2 1a-d (R = Me, Et; R-R = CH2CH2, CMe2CMe2) with hexafluoroacetone yields the thermally unstable phosphites ClC(CF3)2OP(OR)2 4a-d besides other products. Trimethyl phosphite converts 4a-d into the phosphates (MeO)2P(O)OC(CF3)2P(OR)2 (R = Me, Et) 5a and b and the phosphonates (MeO)2P(O)C(CF3)2OP(OR)2 (R-R = CH2CH2, CMe2CMe2) 5c and d, Compounds formed in an Arbuzov reaction.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210228
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese und Struktur von CpAlCl2-Verbindungen mit sterisch anspruchsvollen Substituenten (Cp = Me5C5, EtMe4C5) (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1107-1109 
    Details
    ISSN: 0009-2940
    Keywords: Bulky substituents ; Aluminum compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Structure of CpAlCl2 Compounds with Sterically Demanding Substituents (Cp = Me5C5, EtMe4C5)[1]The compounds Cp*AlCl2 (3) (Cp* = Me5C5) and Cp′AlCl2 (4) (Cp′ = EtMe4C5) have been prepared by the reaction of Cp*SiMe3 (1) and Cp′SiMe3 (2) with AlCl3. The single-crystal X-ray structures of 3 and 4 are reported.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250520
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese und Eigenschaften von 1,2,4,3-Thiadiazaboretidinen. Kristallstruktur des 2,4-Di-tert-butyl-3-phenyl-1,2,4,3-thiadiazaboretidins (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 47-50 
    Details
    ISSN: 0009-2940
    Keywords: Sulfur diimides ; 1,3-Cycloaddition, reductive ; 1,2,4,3-Thiadiazaboretidines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Properties of 1,2,4,3-Thiadiazaboretidines. Crystal Structure of 2,4-Di-tert-butyl-3-phenyl-1,2,4,3-thiadiazaboretidineReaction of sulfur diimides with alkyl(aryl)bis(methylthio)boranes leads to reductive 1,3-cycloaddition of the NSN sequence with formation of the 1,2,4,3-thiadiazaboretidines 2a-g. NMR (1H, 11B, 13C, 15N, 29Si), mass spectra and the results of the X-ray analysis of 21 are reported and discussed. The 11B chemical shifts have been calculated for 3-phenyl-1,2,4,3-thiadiazaboretidine and some related model compounds by the IGLO method and correlate acceptably with the experimental values.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240108
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  • 9
    Electronic Resource
    Electronic Resource
    Zweifache Borylierung von Benzolderivaten mit (Diisoalkylamino)boradiyl-Einheiten (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1907-1912 
    Details
    ISSN: 0009-2940
    Keywords: (Diisoalkylamino)boradiylbenzene derivatives ; Borolo[3,2-b]borole ; 2,8-Diborabicyclo[3.2.1]octa-3,6-diene ; Borylation of benzene derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Twofold Borylation of Benzene Derivatives with (Diisoalkylamino)boradiyl UnitsThe reaction of subvalent boron species generated by the defluorination of difluoro(diorganylamino)borane with Na/K alloy in the presence of 1,4-disubstituted benzene derivatives leads to products which contain two (diorganylamino)boradiyl units and two remaining double bonds which are located on the substituted C atoms. Compounds 5 to 8 exhibit structures based on a 2,8-diborabicyclo[3,2,1]octa-3,6-diene skeleton while 9 shows a skeleton with a 1,3a,4,6a-tetrahydroborolo[3,2-b]borole structure. The latter structure corresponds to that of 1 obtained in the same reaction with benzene. The compounds are characterized by elemental analyses and spectroscopically [MS, NMR (1H, 11B, 13C, 15N, 19F, 29Si)]. X-ray structure analyses are presented for 1, 6, 7, 8, and 9.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240904
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  • 10
    Electronic Resource
    Electronic Resource
    An Uncomplexed 1,2,3-Triborolane Derivative (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 293-294 
    Details
    ISSN: 0009-2940
    Keywords: 1,2,3-Triborolane / Dicyclopentadiene / Dichloro(diisopropylamino)borane, dehalogenation product of / Triborane(5), 1,2,3-tris(diisopropylamino)- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (3α,4β,4aβ,7aβ,8β,8aα)-1,2,3-Tris(diisopropylamino)-1,2,3,3a,44a,5,7a,8,8a-decahydro-4,8-methanoindeno[5,6-d]-1,2,3-triborol (1) is formed from dicyclopentadiene and dichloro(diisopropylamino)borane upon treatment with sodium/potassium alloy in hexane. 1,2,3-Tris(diiso propylamino)triborane(5) (2) was also obtained. 1 is characterized by elemental analyses, spectroscopic data, and by an X-ray structure analysis, 2 by its MS and NMR data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230212
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