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  • 1970-1974  (9)
  • 1940-1944
  • 1935-1939
  • 1970  (9)
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  • 1970-1974  (9)
  • 1940-1944
  • 1935-1939
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  • 1
    Electronic Resource
    Electronic Resource
    Orthoamide, XII Synthese von O.N- bzw. N.N-Acetalen der Acylisocyanate aus Amidacetalen bzw. einem Aminal-tert.-butylester und N-Halogen-carbonsäureamiden, Halogenharnstoffen und N-Chlor-urethan (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 245-255 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XII: Synthesis of Acyl Isocyanate O,N- or -N,N-Acetals from Amide Acetals or from an Aminal tert-Butylester and N-Halogencarbonamides, Halogen Ureas and N-ChlorourethanesDimethylformamide dialkylacetals (2) and aminal-tert-butylester 5 [bis(dimethylamino)-tert-butoxymethane] react with N-halogen carboxylic acid amides, halogen ureas and N-chlorourethanes to give acyl isocyanate-O,N -or -N,N-acetals (isoureas 3 or guanidines 6, respectively).
    Notes: Dimethylformamid-dialkylacetale (2) und Aminal-tert.-butylester 5 (Bis-dimethylamino-tert.-butyloxy-methan) bilden mit N-Halogen-carbonsäureamiden, Halogenharnstoffen und N-Chlor-urethan Acylisocyanat-O.N- bzw. -N.N-acetale (Isoharnstoffe 3 bzw. Guanidine 6).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030132
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  • 2
    Electronic Resource
    Electronic Resource
    Orthoamide, XIII Untersuchungen zum Reaktionsmechanismus der elektrophilen Substitution des Formyl-H-Atoms bei Orthoameisensäureamid-Derivaten (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 256-264 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XIII Studies on the Mechanism of Electrophilic Substitution of the Formyl-H Atom in Ortho Formic Acid AmidesOrtho formic acid amides and N-halogen carboxylic acid amides, halogen ureas or N-chloro urethanes primarily react to give adducts; these form ylides in the presence of bases. The ylides react by an intramolecular SE1- or SNi-mechanism to give O,N-acetals of the corresponding acyl isocyanates (isoureas).
    Notes: Bei der Umsetzung von Orthoamiden mit N-Halogen-carbonsäureamiden, -harnstoffen und N-Chlor-urethan wurden Primär-Addukte nachgewiesen. Diese bilden in Gegenwart von Basen Ylide, welche über einen intramolekularen SE1- oder SNi-Mechanismus C-N-Knüpfung eingehen unter Bildung von O.N-Acetalen der entsprechenden Acylisocyanate (Isoharnstoffe).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030133
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  • 3
    Electronic Resource
    Electronic Resource
    Orthoamide, IX über die Umsetzung CH-acider Verbindungen mit Amidacetalen, einem Aminal-tert.-butylester und Tris-dimethylamino-methan (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 210-221 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, IX: Reaction of CH-Acidic Compounds with Amide Acetals, an Aminal-tert-butylester and Tris(dimethylamino)methaneOrthoamides react with hydrogen cyanide and alkynes to give 2-dimethylamino-2-alkoxy-nitriles (2, 4, 6, 8, 10), 2,2-bis(dimethylamino)nitriles (12,12a), and 3,3-bis(dimethylamino)-alkynes (14-16). Methane derivatives heated with dimethylformamide diäthylacetal (1) react to form the alkylated methane derivatives (25, 26, 28, 29, 30, 34), whereas under mild conditions methane derivatives react with the aminal tert-butylester 11 to produce tetramethyl-formamidinium salts (31, 32, 33, 35).
    Notes: Orthoamide reagieren mit wasserfreier Blausäure und Alkinen zu 2-Dimethylamino-2-alkoxy-nitrilen (2, 4, 6, 8, 10), 2.2-Bis-dimethylamino-nitrilen (12, 12a) und 3.3-Bis-dimethylamino-alkinen-(l) (14-16). Aus Methan-Derivaten und Dimethylformamid-diäthylacetal (1) ent-stehen in der Wärme die alkylierten Methan-Derivate (25, 26, 28, 29, 30, 34) und mit dem Aminal-tert.-butylester 11 unter milden Reaktionsbedingungen die Tetramethylformamidini-um-Salze(31,32, 33,35).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030129
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  • 4
    Electronic Resource
    Electronic Resource
    Orthoamid, XIV. Über die Umsetzung von p-Tolyl- und Anisaldehyd mit einem Aminal-tert.-butylester zu [1.2-Bis-dimethylamino-vinyl]-aryl-ketonen (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 2980-2983 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XIV. On the Reaction of p-Tolyl- and Anisaldehyde with Formic Acid Bis(dimethylaminal) tert-Butyl Ester to [1,2-Bis(dimethylamino)vinyl]-aryl Ketones (4, 5). The reaction is supposed to proceed via bis(dimethylamino)methyl aryl ketone (A, which undergoes disproportionation in a kind of Cannizzaro reaction to yield dimethylaminomethyl aryl ketone 6, isolated as an intermediate.
    Notes: Aus tert-Tolyl(1) bzw. Anisaldehyd (2) entstehen mit Bis-dimethylamino-tert-. butyloxy-methan (3) [1.2-Bis-dimethylamino-vinyl]-aryl-aryl-ketone (4, 5). Ihre Bildung wird über ein intermediäres Bis-dimethylaminomethyl-aryl-keton (A gedeutet, das in einer Art Cannizzaro-Reaktion u.a. das als Zwischenprodukt isolierte Dimethylaminomethyl-aryl-keton 6 ergibt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030935
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  • 5
    Electronic Resource
    Electronic Resource
    Orthoamide, X Reaktionen vinyloger Amidacetale, Aminalester und Amidaminale (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 222-235 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, X: Reaction of Vinylogous Amide Acetals, Aminalesters and Amide AminalsDerivates of vinylogous orthoformic acid amides react with Grignard compounds to give l,3-bis(dimethylamino)-l-alkenes (4-7), with methylene active compounds to give derivates of N.N-disubstituted 4-amino-l,3-butadienes (17  - 29) and with primary aromatic amines to form vinylogous, N,N,N′-trisubstituted amidines (31-36, 38-40).
    Notes: Vinyloge Orthoameisensäureamid-Derivate geben mit Grignard-Verbindungen 1.3-Bis - dimethylamino-alkene-(l) (4-7), mit methylenaktiven Verbindungen N.N-disubstituierte 4 - Amino-butadien-(l.3)-Derivate (17-29) und mit primären aromatischen Aminen vinyloge N.N.N′-trisubstituierte Amidine (31-36, 38-40).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030130
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  • 6
    Electronic Resource
    Electronic Resource
    Orthoamide, XI Umsetzungen von Dimethylformamid-dialkylacetalen mit Isocyanaten (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 236-244 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XI Reactions of Dimethylformamide Dialkyl Acetals with IsocyanatesDimethylformamide dialkyl acetals react with aliphatic and aromatic isocyanates to give parabanic acid O,N-acetals (= 1,3-disubstituted 5-dimethylamino-5-alkoxy-2,4-dioxoimidazolidines) (1). It is likely that an ylide is formed as an intermediate, as shown by reactions.
    Notes: Bei der Umsetzung von Dimethylformamid-dialkylacetalen mit aliphatischen und aromatischen Isocyanaten entstehen Parabansäure-O.N-acetale (= 1.3-disubstituierte 5-Dimethylamino-5-alkoxy-2.4-dioxo-imidazolidine) (1). Die Bildung eines Ylids als Zwischenprodukt konnte wahrscheinlich gemacht werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030131
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesen in der heterocyclischen Reihe, XIV1) Formylierung von 4-Methyl-pyrimidin und Reaktionen des 2-[Pyrimidinyl-(4)]-malondialdehyds (1970)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 737 (1970), S. 46-52 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses in the Heterocyclic Series, XIV1). Formylation of 4-Methylpyrimidine and Reactions of 2-[4-Pyrimidinyl]-malondialdehydeWith an excess of dimethylchloromethyleneiminium chloride 4-methylpyrimidine (1) gives 2-[4-pyrimidinyl]-malonic-dialdehyde (2), while with the stoichiometric quantity of the chloride and of hydrogen chloride N,N-dimethyl-2-[4-pyrimidinyl]-vinylamine (3) is formed. In the same way as the nitrosation this reaction is believed to proceed by a quasi p-quinoid intermediate. On reaction with hydrazines or formamide, 2 yields 4-[4-pyrazolyl]-pyrimidines (4, 5) or 4-[5-pyrimidinyl]-pyrimidine (6); on reaction with N-alkyl-substituted salts of benzothiazole or benzoselenazole γ-substituted pentacyanines (10a-c and 12) result.
    Notes: Die Formylierung von 4-Methyl-pyrimidin (1) mit überschüssigem Dimethylformamidchlorid (Dimethyl-chlormethylen-immoniumchlorid) zu 2-[Pyrimidinyl-(4)]-malondialdehyd (2) und mit äquimolaren Mengen Dimethylformamidchlorid/HCl zu N.N-Dimethyl-2-[pyrimidinyl-(4)]-vinylamin (3) erfolgt analog der Nitrosierung über ein quasi-p-chinoides Zwischenprodukt. 2 gibt mit Hydrazinen bzw. Formamid Ringschluß-Reaktionen zu 4-[Pyrazolyl-(4)]-pyrimidinen (4, 5) bzw. 4-[Pyrimidinyl-(5)]-pyrimidin (6); mit N-Alkyl-substituierten Benzthiazolium- oder Benzselenazolium-Salzen entstehen γ-substituierte Pentamethincyanin-Farbstoffe (10a-c und 12).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19707370105
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesen in der heterocyclischen Reihe, XIII1) Über die Nitrosierung CH-acider Alkylgruppen an Heterocyclen (1970)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 737 (1970), S. 39-45 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses in the Heterocyclic Series, XIII1). Nitrosation of Acidic Alkyl Hydrogen in Heterocyclic CompoundsOn nitrosation with ethyl nitrite in the presence of an excess of hydrogen chloride, methylheterocycles afford hydrochloride salts of the aldoximes which may be liberated by treatment with aqueous potassium hydrogen carbonate. Formation of a quasi-p-quinoid intermediate is thought to be a necessary step in the course of the reaction.
    Notes: Die Nitrosierung von Methylheterocyclen mit Äthylnitrit in Gegenwart von überschüssiger Salzsäure führt zu den Aldoxim-hydrochloriden, die sich mit wäßriger Kaliumhydrogencarbonat-Lösung in die freien Aldoxime (Tab. 1, S. 44) überführen lassen. Für den Reaktionsablauf wird die Ausbildung eines quasi-p-chinoiden Zwischenproduktes gefordert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19707370104
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  • 9
    Electronic Resource
    Electronic Resource
    Hydroperoxide cyclischer β-Diketone1) (1970)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 739 (1970), S. 117-120 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydroperoxides of Cyclic β-Diketones1)Autoxidation of cyclic β-diketones with a tert. α-C-atom gives hydroperoxides in benzenic solution.
    Notes: Bei der Autoxydation cyclischer β-Diketone mit einem tertiären C-Atom in α-Stellung entstehen in benzolischer Lösung Hydroperoxyde.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19707390115
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