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  • 1975-1979  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 628-638 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Nitro Compounds from Tetraalkylammonium NitritesPrimary or secondary bromoalkanes and 2-bromo carbonyl compounds give the nitro derivatives 2, 5 and 7 on reaction with tetraalkylammonium nitrites 1 in dichloromethane or acetonitrile at -50 to 200C. The ratio of nitroalkane and alkyl nitrite (2/3) in the reaction of 1-bromoheptane with the salt 1a in various solvents is investigated. 1,1'-(1,3-Phenylene)dipyrrolidine (6) is a good scavenger for alkyl nitrites.
    Notes: Durch Umsetzung von primären oder sekundären Bromalkanen und 2-Bromcarbonylverbindungen mit Tetraalkylammoniumnitriten 1 in Dichlormethan oder Acetonitril bei -50 bis 200C erhält man die Nitroverbindungen 2, 5 und 7. Das Nitroalkan/Alkylnitrit-Verhältnis (2/3) in verschiedenen Lösungsmitteln wird an der Umsetzung von 1-Bromheptan mit dem Salz 1auntersucht. 1,1'-(1,3-Phenylen)dipyrrolidin (6) eignet sich zum Abfangen der Alkylnitrite 3.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 1937-1945 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Simple Synthesis of Tetraalkylammonium Salts with Functional AnionsTetraalkylammonium tetrafluoroborates react with potassium salts to give corresponding tetraalkylammonium salts 2 with functional anionic groups.  -  Methylation of tertiary amines with methyl chloroformate affords trialkyimethylammonium chlorides 3.
    Notes: Tetraalkylammoniumsalze 2 mit funktionellen anionischen Gruppen erhält man durch Umsetzung von Tetraalkylammonium-tetrafluoroboraten mit entsprechenden Kaliumsalzen.  -  Tertiäre Amine werden von Chlorameisensäure-methylester zu Trialkylmethylammoniumchloriden 3 methyliert.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 1946-1962 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Nitriles with Tetraalkylammonium CyanidesPrimary and secondary alkyl halides, 2-halo carboxylic esters, as well as acyl halides react with tetraalkylammonium cyanides 1a, 1b in polar aprotic and nonpolar solvents to give the nitriles 2-8. 2-Halo ketones form oxiranecarbonitriles 9 under mild conditions. Under more vigorous conditions, especially in presence of tetraethylammonium bromide, 3-oxonitriles 11 are the reaction products. The reactivity of the salts 1a and 1b in different solvents is investigated.
    Notes: Primäre und sekundäre Halogenalkane, 2-Halogencarbonsäureester und Acylhalogenide setzen sich in polar-aprotischen und unpolaren Solventien mit den Tetraalkylammoniumcyaniden 1a und 1b zu den Nitrilen 2-8 um. 2-Halogenketone bilden unter milden Bedingungen 2-Oxirancarbonitrile 9, unter verschärften Reaktionsbedingungen, besonders in Gegenwart von Tetraethylammoniumbromid die 3-Oxonitrile 11.  -  Die Reaktivität der Salze 1a und 1b in verschiedenen Lösungsmitteln wurde untersucht.
    Additional Material: 12 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 1249-1266 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactions of 2-Chloro-1,3-thiazin-4-ones2-Chloro-1,3-thiazin-4-ones 2 and 4 are prepared by cyclization of 2-thiocyanatocarboxylic acid chlorides 1 and 3, respectively, with hydrogen chloride. The compounds 2 and 4 are cyclic, azavinylogous acid chlorides of ambivalent character and react with amines undergoing substitution of chlorine or fragmentation. The structure of the 2-amino-1,3-thiazin-4-ones 9 and 14 and the aromatic character of the 1,3-thiazin-4-ones 2 and of the 1,3-thiazinium salts 18 are investigated.
    Notes: 2-Chlor-1,3-thiazin-4-one 2 und 4 sind durch Cyclisierung von 2-Thiocyanatocarbonsäurechloriden 1 bzw. 3 mit Chlorwasserstoff zugänglich. Sie besitzen als cyclische, azavinyloge Säurechloride ambivalenten Charakter und reagieren mit Aminen unter Substitution des Chlors oder Fragmentierung. Die Struktur der 2-Amino-1,3-thiazin-4-one 9 und 14 sowie der aromatische Charakter der 1,3-Thiazin-4-one 2 und der 1,3-Thiaziniumsalze 18 werden untersucht.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 5
    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
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  • 6
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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