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  • Chemistry  (18)
  • General Chemistry  (15)
  • Organic Chemistry  (2)
  • 1,1-bis(2,4-dimethylphenyl)-2-butyn-1-ol  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Studies on hydroxy inclusion complexes. I. Host-guest interaction of the molecular complexes of 9-hydroxy-9-(1-propynyl) fluorene and 1,1-Bis (2,4-dimethylphenyl)-2-butyn-1-ol with water, methanol, ethanol, andn-propanol (1987)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 567-579 
    Details
    ISSN: 1573-1111
    Keywords: 9-hydroxy-9-(1-propynyl)fluorene ; 1,1-bis(2,4-dimethylphenyl)-2-butyn-1-ol ; water, methanol ; ethanol,n-propanol ; molecular inclusion ; nonbonded interaction ; relative stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Molecular inclusion by hydroxy host systems (9-hydroxy-9-(1-propynyl)fluorene+guest and 1,1-bis(2,4-dimethylphenyl)-2-butyn-1-ol+guest) has been investigated by using an empirical potential function. Water, methanol, ethanol, andn-propanol have been employed as guest molecules and their relative stabilities are considered. Alcohol is found to be more suitable than water as a guest molecule in the two tested host molecules. It is also found that the nonbonded interaction is the most important factor in determining the relative stabilities of hydroxy host systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662996
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  • 2
    Electronic Resource
    Electronic Resource
    Chemie thermisch und photochemisch erzeugter Cyclobutan- und Cyclobutenylidene (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2249-2260 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Thermally and Photochemically Generated Cyclobutan- and CyclobutenylidenesEHT- and MINDO/3-calculations of endo- and exocyclic 4-membered ring carbenes with 4π (1), 6π (2 and 6), and 8π (8) electrons are presented. Flash thermolysis and photolysis of suitable precursors yield 18 intramoleculary. Intermolecular reactions afford 15, 19, and 20. Multiplicities of carbenes 1, 2, 6, and 8, are discussed.
    Notes: EHT- und MINDO/3-Rechnungen an endo- und exocyclischen Vierringcarbenen mit 4π (1), 6π (2 und 6) und 8π (8) Elektronen werden vorgestellt. Blitzthermolysen und Photolysen der entsprechenden Carbenvorläufer führen zu den intramolekularen Reaktionsprodukten 18. Intermolekulare Reaktionen liefern 15, 19, 20. Entsprechende Multiplizitäten von 1, 2, 6 und 8 werden erörtert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190718
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  • 3
    Electronic Resource
    Electronic Resource
    Ideal enantiomeric resolution by recrystallization of a racemic compound (part 4): Relationship between enantiomeric resolution phenomenon and crystal properties (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 220-224 
    Details
    ISSN: 0899-0042
    Keywords: racemic compound crystal ; mixed crystal of (+) and (-) enantiomers ; enantiomeric enrichment in solution ; reversal of chirality ; X-ray powder diffraction ; chiral sulfonium sulfonate ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new example of a racemate showing unusual enantiomeric resolution phenomenon, in which simple recrystallization of the racemate leads to remarkable enantiomeric enrichment of either enantiomer up to 100% ee in the mother liquor, has been found. This compound is (±)-[2-[4-(3-ethoxy-2-hydroxypropoxy)phenylcarbamoyl]-ethyl]dimethylsulfonium p-nitrobenzenesulfonate [EtOCH2CH(OH)CH2OC6H4NHCOCH2CH2SMe2+O2NC6H4SO3-] [(±)-SN]. By repeating recrystallization of (±)-SN and the resulting deposited crystals successively and collecting the resulting enantiomerically enriched mother liquors with the same chirality sense, highly efficient enantiomeric resolution of the racemate into its separate enantiomers has been accomplished. The relationship between the occurrence of this enantiomeric resolution phenomenon and the crystal properties has been investigated with respect to SN and its aryl- and alkylsulfonate derivatives. The mode of enantiomeric resolution of (±)-SN was similar to that of para-substituted benzenesulfonate derivatives (±)-ST (4-MeC6H4SO3-) and (±)-SC (4-ClC6H4SO3-) previously reported, whereas the unsubstituted derivative (±)-SB (C6H5SO3-) and alkysulfonate derivatives (±)-SO (n-C8H17SO3-) and (±)-SM (CH3SO3-) did not show such an enantiomeric resolution phenomenon. The crystalline form of the former racemates that underwent the enantiomeric resolution was racemic compounds, while the latter were mixed crystals (solid solutions) composed of the respective optical antipodes. Chirality 9:220-224, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Naphthocyclobutenes and Benzodicyclobutadienes: Synthesis in the Solid State and Anomalies in the Bond Lengths (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1377-1386 
    Details
    ISSN: 1434-193X
    Keywords: Diallenes ; Solid-state reactions ; Naphthocyclobutenes ; Benzodicyclobutadiene ; Through-bond interactions ; X-ray analysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The title four-membered ring compounds, naphthocyclobutenes and benzodicyclobutadienes, were produced by thermal cyclization reaction of crystalline 1,2-diallenylbenzenes and 1,6-diethynyldiallenes, respectively. These solid-state reactions proceeded efficiently and stereoselectively. The naphthocyclobutenes were shown to have extremely long C(sp3)-C(sp3) bonds (1.720-1.733 Å). The benzodicyclobutadienes were also shown to have extremely long C(sp2)-C(sp2) bonds (1.540 Å).
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanism of solid-solid resolution of pantolactone (1996)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 9 (1996), S. 795-800 
    Details
    ISSN: 0894-3230
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The enantioselective solid-solid clathration of (S)-pantolactone (1) into (R,R)-trans-2,3-bis(diphenylhydroxymethyl)-1,4-dioxaspiro[4·4]nonane (2) and -[4·5]decane (3) was studied preparatively and mechanistically using atomic force microscopy (AFM) measurements and crystal packing data. Short-distance solid-to-solid sublimation mechanisms occur in both cases with initial formation of epitaxial floes along the b-axis in 2 and random craters in 3. The bulk control in the phase rebuilding stage is understood from the particular crystal packings. Bulk control was largely lost in the phase transformation stage when passivation of the surfaces occurred in both cases. The host lattices of 2 and 3 exhibit closed molecular double layers with all hydroxyl groups inside and lacking access for intercalation of 1. The reaction has to start at isolated surface defects. Once started, new doors for further entrance of guest molecules (S)-1 are opened in the double layer. For practical use, both the crystallographic difficulties and the passivation have to be overcome. A slurry technique involving addition of stoichiometric amounts of water to the solids provided useful conditions for the preparative resolution of (R/S)-1 or further racemates exhibiting passivation, whereas heating alone speeded up the resolution of 2-methylpiperazine with 2. © 1996 John Wiley & Sons, Ltd.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Atomic force microscopy and Solid-State rearrangement of benzopinacol (1995)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 8 (1995), S. 545-551 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The solid-solid chemical reaction of benzopinacol (1) with p-toluenesulphonic acid monohydrate (2) to give a quantitatively proton-catalysed pinacol rearrangement with formation of triphenylacetophenone (3) in the absence of a solvent was studied preparatively and mechanistically using atomic force microscopy (AFM) measurements and known crystal structure data. The reaction rate is dramatically enhanced if the water of reaction is continuously removed. AFM reveals that no reaction occurs on (001) of 1 whereas (100) exhibits distance dependent craters and volcano-like mounds over areas extending to 1·5 mm from the contact edge of the crystals with 1 undergoing phase rebuilding while reacting. A mechanism resembling the formation of membrane potentials is seen for the first time in crystals. Thus it appears that catalytic protons migrate without their counterions from one molecular compartment to the next by proton consumption at its inside and proton liberation at its outside, which is the inside of the next compartment. The uppermost molecular layer determines reactivity or non-reactivity. On (001) of 1 the hydroxyl groups occur with their hydrogens up. Hence no AFM features are found and crystals of 2 do not become adhered to 1. However, on (100) the hydroxyl hydrogens point down (free electron pair up). Protonation is possible, chemical reaction is indicated by the formation of the AFM features and crystals of 2 adhere firmly to the surface of 1 after reaction.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610080805
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  • 7
    Electronic Resource
    Electronic Resource
    Komplexierung eines Benzodicyclobutadiens (Dicyclobutabenzols) mit Fe2(CO)9Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft unterstützt. (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 92 (1980), S. 952-953 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19800921124
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  • 8
    Electronic Resource
    Electronic Resource
    Isolierung einzelner Konformationsisomere von α- und β-Ionon durch Einschlußkomplexbildung (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 102 (1990), S. 688-689 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19901020618
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  • 9
    Electronic Resource
    Electronic Resource
    Oxidative Kupplung von racemischem und von optisch aktivem 3,6-Di-tert-butylocta-1,4,7-triin-3,6-diol (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 100 (1988), S. 872-873 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19881000619
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  • 10
    Electronic Resource
    Electronic Resource
    Festkörperreduktion von Ketonen mit NaBH4 (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 101 (1989), S. 329-330 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19891010317
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