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  • 1
    Electronic Resource
    Electronic Resource
    Thienoanellierte 6aλ4-Thia-1,6-diazapentalene durch baseninduzierte Dimerisierung von 5-Methyl-isothiazoliumsalzenHerrn Prof. Dr. Rolf Borsdorf zum 60. Geburtstag gewidmet (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 25-33 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thienoanneleted 6aλ4-Thia-1,6-diazapentalenes by Baseinduced Dimerisation of 5-Methyl-isothiazolium SaltsIsothiazolium salts 2 and 3 are easily available by reaction of (Z/E)-β-thiocyanatovinyl aldehydes with primary aliphatic and aromatic amines in acetic acid or with aromatic amine hydrochlorides, respectively. Preparative advantages of this reaction are demonstrated and discussed. Reaction of 3 with secondary amines results in an unexpected formation of 6aλ4-thia-1,6-diazapentalenes 5, a new typ of thiadiazapentalenes anellated with a heterocyclic ring system. The structure of 5 was evidenced by IR, UV, 1H-, 13C-n.m.r. spectral data and supported by elemental analysis. By means of 15N- and 13C-n.m.r. spectroscopy the synthesized thiadiazapentalenes were found to be stable towards protonation.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340105
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    1,3-Dipolare Cycloadditionen von Azomethin-yliden (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 2146-2152 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Dipolar Cycloadditions of Azomethine Ylides1,3-Dipolar cycloadditions of the azomethine ylides 2 and 9 with Schiff′s bases have been investigated. Depending on the structures of both the dipolarophiles and the dipoles, cycloadducts of “exo” and/or “endo” type were formed.
    Notes: Die 1,3-dipolaren Cycloadditionen der Azomethin-ylide 2 und 9 mit Schiffschen Basen wurden untersucht. Es bilden sich Cycloaddukte vom “exo”-und/oder “endo”-Typ in Abhängigkeit von der Struktur des Dipolarophils und des Dipols.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219821205
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  • 3
    Electronic Resource
    Electronic Resource
    1,3-Dipolare Cycloadditionen von 3,4-Dihydro-6,7-dimethoxyisochinoliniumsalzen (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 924-929 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Dipolar Cycloadditions of 3,4-Dihydro-6,7-dimethoxyisoquinolinium Salts1,3-Dipolar cycloadditions of 3,4-dihydro-6,7-dimethoxyisoquinolinium salts3 with 6,7-dialkoxy-3,4-dihydroisoquinolines 1 have been investigated. Dependent on the structure of both the dipolarophiles and the dipoles, cycloadducts of exo- and/or endo type are formed. The exo/endo ratio depends on temperature.
    Notes: Die 1,3-dipolaren Cycloadditionen von 3,4-Dihydro-6,7-dimethoxyisochinoliniumsalzen 3 mit 6,7-Dialkoxy-3,4-dihydroisochinolinen 1 wurden untersucht. Es bilden sich Cycloaddukte vom exo- und/oder endo-Typ in Abhängigkeit von der Struktur des Dipolarophils und des Dipols. Das exo/endo-Verhältnis ist temperaturabhängig.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219820512
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese, Struktur und Reaktionen von α-Campholenepoxiden (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 987-991 
    Details
    ISSN: 0170-2041
    Keywords: Sandalwood odour ; Epoxidation, stereocontrolled ; Campholenic derivatives ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis, Structure and Reactions of α-Campholenic EpoxidesThe epoxidation of α-campholenic compounds 3, 4 is described, besides the rearrangement of the epoxides 5 and 6 into the hydroxy-β-campholenic system 7, 8, the reduction to the tertiary alcohols 11a, 12a, the alkylation reaction to 11b and 12b and the conversion of 7 into the diketone 10 are reported. The stereochemistry and the odour of the new compounds are also described.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1993199301157
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