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  • 1
    Monograph available for loan
    Monograph available for loan
    Über Stoßwellen in Flüssigkeiten durch elektrisch ausgelöste Drahtexplosionen (1972)
    Details Availability
    Call number: SR 90.0139
    Type of Medium: Monograph available for loan
    Pages: 138 S.
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Macrocyclic (1,3)- and (1,4)-benzena-(1,4)-piperazinacyclophanes (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 1515-1519 
    Details
    ISSN: 0947-3440
    Keywords: Macrocycles ; Recognition ; Piperazines ; Self-assembly ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New large, up to 45-membered macrocycles were synthesised from piperazine and m- and p-2,6-bis(bromomethyl)xylene under high dilution conditions. X-ray structures of compounds 3a, 4a, 5a, and 8b were determined. Surprisingly, none of the macrocycles prepared showed any inclusion properties towards small guest molecules. Instead, the compounds were found to self-organize during the packing process into larger structures due to the complementary of the molecular skeletons. In the crystalline state 3a forms nets, where the macrocycles are bound by H—C—H…N interactions to each other. 4a exits in a dimeric structure, which, in turn, further extends to a sheet structure. The positively charged phane 8b (di-dihydrochloride salt) adopts a chair-chair conformation, confirming that protonation of the N atoms does not change the conformation.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1995199508207
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  • 3
    Electronic Resource
    Electronic Resource
    Conversion of ethanol over zeolite H-ZSM-5 (1994)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 17 (1994), S. 179-186 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The conversion of ethanol over H-ZSM-5 was studied as a function of ethanol partial pressure, reaction temperature, weight hourly space velocity and Si/Al ratio. The results obtained were in qualitative agreement with most of those in the literature. Combination with all published results to give a significant regression model was not possible due to the large scatter of the data from various scientific groups. In mechanistic investigations, temperature programmed reaction measurements of ethanol, diethyl ether and ethene were performed. The formation of ethene from ethanol via direct elimination or from diethyl ether as intermediate could be confirmed. In the conversion of ethanol/water mixtures, the product distribution did not change significantly up to a water content of 60 wt%. Then, a pronounced increase of ethene formation and a considerable decrease of the yields of aromatics was observed. When several reaction mixtures from syngas conversion to ethanol were converted over H-ZSM-5, the coking rate depended on the product distribution in the feed. Product mixtures from processes with higher amounts of compounds having an unfavourable C/H ratio led to rapid deactivation of the zeolite.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270170306
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  • 4
    Electronic Resource
    Electronic Resource
    Über einige Thymolderivate aus Gaillardia- und Helenium-Arten (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 864-871 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Wurzeln von Gaillardia- und Helenium-Arten enthalten in relativ großer Menge viele schwer trennbare Ester, die durch ihre Spektren und Abbaureaktionen als mehr oder weniger stark abgewandelte Derivate des Thymols (1, 2, 7, 8, 11, 12, 14, 15, 16, 17) erkannt wurden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691020319
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  • 5
    Electronic Resource
    Electronic Resource
    1,6-Anhydrofuranosen, IX. Selektive Monotosylierung der 1,6-Anhydro-α-D-galactofuranose. Synthese und Bestimmung der Molekülstruktur der 1,6 :3,5-Dianhydro - α-D-gulofuranose (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2068-2078 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,6-Anhydrofuranoses, IX. Selective Monotosylation of 1,6-Anhydro-α-D-galactofuranose. Synthesis and Structure Determination of 1,6: 3,5-Dianhydro-α-D-gulofuranoseReaction of 1,6-anhydro-α-D-galactofuranose (1a) with 1.7 mol ρ-toluenesulfonyl chloride gives a mixture of all possible tosylates, the 3-0-derivative 1f with than 40% isolated yield predominating. Cyclization of 1f yields 1,6:3,5-dianhydro-α-D-gulofuranose (2a) with 2,5,7-trioxatricyclo[4.2.1.03.8]nonane skeleton. the structure of it being determined by X-ray crystallography and discussed in comparison to the equally determind structure of 1,6-anhydro-α-L-gulofuranose (3a).
    Notes: Umsetzung von 1,6-Anhydro-α-D-galactofuranose (1a) mit 1.7 mol ρ-Toluolsulfonylchlorid liefert ein Gemisch aller denkbaren Tosylate, in dem das 3-0-Derivat 1fmit über 40% isolierter Ausbeute überwiegt. Dieses läßt sich zur 1,6:3,5-Dianhydro-α-D-gulofuranose (2a) mit 2,5,7-Trioxatricyclo[4.2.1.03.8] nonan-Gerüst cyclisieren, deren Struktur wie die der 1,6-Anhydro-α-L-gulofuranose (3a) durch Röntgenstrukturanalyse bestimmt und diskutiert wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120617
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  • 6
    Electronic Resource
    Electronic Resource
    1,6-Anhydrofuranosen, X. Eine einfache Synthese für 1,6-Anhydro-3-desoxy-α-D-xylo-hexofuranose (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2337-2341 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,6-Anhydrofuranoses, X. A Simple Synthesis for 1,6-Anhydro-3-deoxy-α-D-xylo-hexofuranoseTreatment of 1,6-anhydro-2,3,5-tri-O-tosyl-α-D-galactofuranose (1) with KOH in dioxane/water gives by way of cis-elimination 1,6-anhydro-3deoxy-5-O-tosyl-α-D-threo-hexofuranos-2-ulose (2) in good yield, which tends to dimerize easily in an aldol type reaction to 3. NaBH4 reduces 2 stereoselectively to 4a Removal of the tosyl group giving the title compound 4c is accomplished by sodium amalgam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120641
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  • 7
    Electronic Resource
    Electronic Resource
    Conversion of ethanol over metal-exchanged zeolites (1993)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 16 (1993), S. 332-337 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of metal exchange between zeolites and alkali metals (Li, Na, K; zeolite Y, ZSM-5, T), alkaline earths (Mg, Ca, Sr, Ba; ZSM-5), transition metals (La, Ce, Cr, Mn, Fe, Co, Ni, Pd, Cu, Zn; ZSM-5) and aluminium (ZSM-5) on the conversion of ethanol were studied. Activities of the catalysts and selectivities for ethene, C3+ olefins, paraffins and arenes strongly depended on the cation, chosen for the modification. Only ethene was formed by alkali exchanged zeolites, the most active being Li-Y. This could be confirmed by a long-term ageing test with Li-Y pellets under semi-industrial conditions. The exchange of ZSM-5 with alkaline earths or transition metals permitted the formation of a wide variety of products, raning from high ethene to high aromatic yields. A correlation between certain product selectivities and electronegativity was only possible in a rough approximation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270160509
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  • 8
    Electronic Resource
    Electronic Resource
    Use of a combined GC/FTIR/MS system for the analysis of spirits (1995)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 351 (1995), S. 530-535 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The analysis of various spirits using a GC-IR-MS coupling permits the qualitative description of their constituents based on their characteristic spectra. Sample preparation, instrumentation, experimental parameters and peak identification using a combined library search are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322728
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  • 9
    Electronic Resource
    Electronic Resource
    Regioselektive Substitution an [2.2]Metacyclophanen via Chromtricarbonyl-Komplexe (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1415-1423 
    Details
    ISSN: 0009-2940
    Keywords: [2.2]Metacyclophanes ; Chromium tricarbonyl complexes ; Chirality, helical, planar ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Regioselective Substitution of [2.2]Metacyclophanes via Chromium Tricarbonyl ComplexesThe [2.2]metacyclophanes 6, 8, and 9 are regioselectively complexed with triammintricarbonylchromium. The complexes are lithiated with nBuLi/TMEDA at -78°C, and the resulting aryllithium complexes are trapped with electrophiles to give new phanes exhibiting substitution patterns, which are not or more difficult available by other routes. Complex 6a gives 5-substitution almost exclusively, while the chiral complex 8a is substituted in positions 5 and 4 in a ratio of 3:1. Steric effects, caused by the large dithiane group, seem to play a role in both complexation and derivatisation of these substrates. An X-ray crystal structure analysis of the chromium tricarbonyl phane complex 11 is performed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240616
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  • 10
    Electronic Resource
    Electronic Resource
    Tricarbonylchrom-Komplexe von chiralen [2.2]Metacyclophanen: Darstellung, Struktur und chiroptische Eigenschaften (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2553-2569 
    Details
    ISSN: 0009-2940
    Keywords: Chirality ; Chromium complexes ; Helicity ; Configuration (absolute) ; [2.2]Metacyclophanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tricarbonylchromium Complexes of Chiral [2.2]Metacyclophanes: Syntheses, Structures, and Chiroptical PropertiesHPLC-baseline separations of three racemic cyclophanes 3, 4, and 6 on cellulose tris(3,5-dimethylphenyl)carbamate led to their enantiomers with high optical purity. Complexation of (-)-3 and (+)-3 with triamminetricarbonylchromium yielded chiral Cr(CO)3 complexes (-)-(S)P-(3S)M-3a and (+)-(R)P-(3R)M-3a stereoselectively. Derivatisation of the complexes by lithiation and reaction with electrophiles gave new substituted chiral Cr(CO)3 complexes of [2.2]metacyclophanes regio-selectively. X-ray structure analyses of one chiral chromium complex (-)-(R)P-(5S)M-14a and three chiral chromium-free ligands (-)-(S)P-3, (-)-(S)P-4, and (-)-(S)P-6 led to the assignment of the absolute configurations of all chiral compounds discussed here. The influences of substituents on the chiroptical properties are investigated. The helicity of [2.2]metacyclophanes is discussed. For the first time X-ray structure analyses were performed of a bis-Cr(CO)3 complex (9a) as well as of the first chromium complex 10a of a heteraphane. Dethioketalisation of (-)-(S)P-3 with NBS gave (-)-(S)P-18, the absolute chirality of which has been known, under retention of configuration.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921251130
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