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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 101-110 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A New Synthesis of 6H-1,3-ThiazinesA new method for the synthesis of 1,3-thiazines is described. The addition of nucleophiles to γ-isothiocyanatoallylchlorides (1a-j) leads to functionalisation and subsequent cyclisation (nucleophilic cyclofunctionalisation). Reaction of secondary amines or alcohols under catalysis by tert. amines gives numerous 2-dialkylamino- (3a-w) or 2-alkoxy-6H-1,3-thiazines (4a-p).
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 433-442 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Characterization of Polychlorinated IsobutenesThe preparation of polychlorinated methallylic chlorides by continuous chlorination of isobutene with different ratios of chlorine and following HCl-elimination is described. The structure is proved by reaction of the polychlorinated isobutenes with sodium thiolacetate and potassium thiocyanate and by spectroscopic methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 687-693 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Methylated Fencholenic and α-Campholenic Aldehyde - Synthesis and ReactionsThe syntheses of α-methylated fencholenic (6a) and α-campholenic aldehyde (6b) via the corresponding azomethines (5) are reported. Aldol condensations of 6a, b with following reductions give the allylic alcohols (12-16) and hydrogenation the saturated alcohols (17-21) with strong woody odors, some of the allylic alcohols resembling that of sandal wood. Simple reduction or oxidation of 6a, b give the alcohols (24, 27), ethers (26), esters (23, 25, 28) and ketones (29) which have interesting woody odors with spicy, earthy and herbaceous notes.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 153-158 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Als Testsubstanzen zur Untersuchung der Abbauprodukte von Diacetylen-MANNICH-Basen-methojodiden mit wäßriger Kalilauge wurden die isomeren Octendiine und Nonendiine 1-3 synthetisiert und deren gaschromatographische Identifizierung untersucht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 169-171 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 381-389 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Phenyl-substituted Alkene-diynes by Alkaline Degradation of Quaternary Salts of Mannich Bases Derived from Phenyl-alka-1,3-diynesIsomeric phenyl- and p-methoxyphenylsubstituted hexenediynes are formed by alkaline degradation of quaternary salts of aryldiacetylene-Mannich bases. The reaction is a diethynylogic Hofmann elimination. The degradation with sodium amide mainly results in the formation of trans-alkenediynes with a terminal triple bond. Using aqueous potassium hydroxide, the degradation yields the isomers with terminal double bond exclusively. This is in contrast to the reaction of aliphatic diacetylene-Mannich base methoiodides.
    Notes: Isomere Phenyl- und p-Methoxyphenylhexendiine werden durch alkalischen Abbau quartärer Salze von Aryldiacetylen-Mannichbasen über eine diäthinyloge Eliminierung erhalten. Der Abbau mit Natriumamid ergibt bevorzugt die Alkendiine mit endständiger Dreifachbindung in der trans-Konfiguration. Beim Abbau mit wäßriger Kalilauge entstehen im Gegensatz zu den nicht phenylsubstituierten Diacetylen-Mannichbasen ausschließlich die Isomeren mit endständiger Doppelbindung.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 799-806 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reaction of Strong Bases with Quaternary Methallylammonium Compounds. V. The Base-Promoted Rearrangement of N-Methallyl-N-methylpiperidiniumiodide and -morpholiniumiodideThe competition of STEVENS rearrangement and HOFMANN degradation with ring opening of the two title compounds was studied using sodium amide, methylsulfinyl-carbanion, and butyllithium, respectively. The reaction of N-methallyl-N-methylpiperidinium iodide with sodium amide and methylsulfinyl-carbanion mainly yields a [3,2]-but with butyllithium mainly a [1,2]- STEVENS rearrangement. N-Methallyl-N-methylmorpholinium iodide exclusively yields the elimination product without any rearrangement.
    Notes: Es wird die Konkurrenz von STEVENS-Umlagerung und Eliminierung mit Ringöffnung bei der Einwirkung von Natriumamid, Methylsulfinyl-carbanion oder Butyllithium auf die Titelverbindungen untersucht. Natriumamid und Methylsulfinyl-carbanion ergeben bei der Einwirkung auf N-Methallyl-N-methylpiperidiniumjodid bevorzugt eine [3,2]-, mit Butyllithium dagegen hauptsächlich eine [1,2]-STEVENS-Umlagerung. N-Methallyl-N-methylmorpholiniumjodid liefert ausschließlich das Morpholin-Ringöffnungsprodukt und keine Umlagerung.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 1008-1018 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Action of Strong Bases on Quaternary Methallylammonium Compounds. III. Base-initiated Rearrangement of Methyldialkyl- and Trialkylmethallylammonium SaltsMethyl-diethyl-, methyl-dipropyl- and methyl-dibutyl-methallylammoniumiodide rearrange in the presence of sodium amide, sodium methylsulfinylcarbanion or butyllithium to give mainly the products of the [1,2]-Stevens-rearrangement with methallyl-ylid as an intermediate. Products of [1,2]-rearrangement of the bulky alkyl-groups with alkyl-ylid as an intermediate are formed in small amounts.In contrast to this and to the known degradation of trimethyl- and dimethylalkyl-methyallyl-ammonium salts the action of the bases on triethyl-, tripropyl- and tributyl-methallylammonium salts gives also the [1,4]-besides the [1,2]-rearrangement.
    Notes: Methyl-diäthyl-, Methyl-dipropyl- und Methyl-dibutyl-methallyl-ammoniumjodid liefern bei der Einwirkung von Natriumamid, Methylsulfinyl-carbanion oder Butyllithium bevorzugt [1,2]-Stevens-Umlagerungsprodukt über das Methallyl-Ylid. [1,2]-Verschiebungen der größeren Alkylgruppen über Alkyl-Ylide konnten nur in geringem Maße festgestellt werden.Im Gegensatz dazu und zu den schon früher beschriebenen Abbaureaktionen von Trimethyl- und Dimethylalkyl-methallyl-ammoniumsalzen wurden durch die Baseneinwirkung auf Triäthyl-, Tripropyl- und Tributyl-methallyl-ammoniumhalogenide zusätzlich zu den [1,2]- in größerem Umfang auch [1,4]-Umlagerungen nachgewiesen.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 463-474 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with 1,3-Dichloro-2-methylenepropane. III. Synthesis and Reactions of 1,3-Diamino-2-methylenepropanes1,3-Bis(dialkylamino)-2-methylenepropanes are obtained by reaction of the chlorination product of isobutene with secondary amines. The synthesis of 1,3-diamino-2-methylenepropane succeeds by Gabrielsynthesis, by reaction of 1,3-diiodo-2-methylenepropane with liquid ammonia and by dehydration of 1,3-diamino-2-methyl-2-propanol, obtained from methallylchloride. The use of 1,3-diamino-2-methylenepropane as a C3N2-reagent for the synthesis of heteroalicycles is described.
    Notes: Bis(dialkylamino)-2-methylenpropane werden aus dem Isobutenchlorierungsprodukt durch Umsetzung mit sekundären Aminen erhalten. Die Synthese des 1,3-Diamino-2-methylenpropans gelingt durch Gabriel-Synthese, durch Aminierung des 1,3-Dijod-2-methylenpropans und durch Dehydratisierung des aus Methallylchlorid erhältlichen 1,3-Diamino-2-methylpropanols-(2). Die Verwendung des 1,3-Diamino-2-methylenpropans als C3N2-Baustein für Heteroalicyclensynthesen wird beschrieben.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 629-637 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Characterisation of VinylisothiocyanatesThe preparation of vinylisothiocyanates by treatment of γ-chloroallylchlorides with KSCN followed by rearrangement of the γ-chloroallylthiocyanates is described. The structure is proved by the reaction of the vinylisothiocyanates with mercaptides and by spectroscopic methods.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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