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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1297-1303 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of Derivatives of 2-AzabutadieneThe addition of diphenyl ketimine (1) to alkynes 2 which are activated by alkoxycarbonyl groups leads to mixtures of E- and Z-isomers of 1,1-diphenyl-2-azabutadienecarboxylic esters 3. The Hofmann degradation of quaternary salts 5 obtained from benzaldehyde or benzophenone and N,N-dialkyl-1,2-ethanediamines by subsequent methylation of the Schiff′s bases 4, yields N-(phenylmethylene)- and N-(diphenylmethylene)ethenamine 6a and 6d, respectively. The formation of 6a has further been achieved by dehydrohalogenation of the 2-chloroethylimine 10, by thermolysis of the xanthogenate 12 as well as by sulfonate elimination from the sulfonic esters 15. Reactions of 6a with alcohols lead to N, O-acetals 7, with thiols to the N,S-acetals 8, and with diphenyl ketimine to the iminal 9.
    Notes: Die Addition von Diphenylketimin (1) an durch Alkoxycarbonylgruppen aktivierte Alkine 2 führt zu Gemischen der E- und Z-Formen von 1,1-Diphenyl-2-azabutadiencarbonsäureestern 3. - Quartärsalze 5, die durch Methylierung Schiffscher Basen 4 aus Benzaldehyd oder Benzophenon und N, N-Dialkyl-1,2-ethandiaminen erhalten werden, liefern durch Hofmann-Abbau N-(Phenylmethylen)- und N-(Diphenylmethylen)ethenamin (6a bzw. 6d). 6a ist auch durch Dehydrohalogenierung des 2-Chlorethylimins 10, durch Thermolyse des Xanthogensäureesters 12 sowie durch Sulfonat-Eiminierung aus den Soulfonsäureestern 15 zugänglich; seine Umsetzung mit Alkoholen führt zu N, O-Acetalen 7, mit Thioalkoholen zu N, S-Acetalen 8 und mit Diphenylketimin zum Iminal 9.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 717-719 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,1-Diphenyl-2-azaallenium Ions as IntermediatesUnder elimination of trimethylamine and formation of 1,1-diphenyl-2-azaallenium ion intermediates 2d from [(diphenylmethylene)aminomethyl]trimethylammonium iodide (5) on heating with sodium methanolate the N-(diphenylmethylene)methoxymethylamine (6) is obtained. With sodium methanethiolate the N-(diphenylmethylene)methylthiomethylamine (7), with sodium cyanide the [(diphenylmethylene)amino]acetonitrile (8) are formed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 1928-1936 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N-(Diarylmethylene)alkylidenediaminesFrom reactions of diarylketimines with N,N-dialkylmethyleneammonium salts or via condensation with aldehydes and secondary amines the N1,N1-dialkyl-N2-(diarylmethylene)alkylidenediamines 3, 6 and 7 were obtained. For the analogous ring-substituted derivatives 10, 11 and 12 E-and Z-isomers have been assigned by 1H-NMR-spectroscopy.  -  Upon heating of equimolar amounts of diphenylketimine and paraformaldehyde N-(diphenylmethylene)aminomethanol (13) was formed. The N1,N2-bis(diphenylmethylene)methylenediamine (15) however, is prepared most conveniently by heating of N-(diphenylmethylene)methoxymethylamine (14) with diphenylketimine in the presence of tetrafluoroboric acid. The synthesis of N1,N2-bis(diphenylmethylene)-benzylidenediamines 17 has been achieved by means of acid catalysed reaction of the corresponding acetals with diphenylketimine.
    Notes: Aus Diarylketiminen entstehen durch Umsetzung mit N,N-Dialkylmethylenammoniumsalzen oder durch Kondensation mit Aldehyden und sekundären Aminen N1,N1-Dialkyl-N2-(diarylmethylen)alkylidendiamine 3, 6 oder 7. Bei den entsprechenden kernsubstituierten Derivaten 10, 11 und 12 lassen sich E- und Z-Formen durch 1H-NMR-Spektroskopie nachweisen.  -  Während durch Erhitzen äquivalenter Mengen Diphenylketimin und Paraformaldehyd N-(Diphenylmethylen)aminomethanol (13) erhalten wird, ist das N1,N2-Bis(diphenylmethylen)methylendiamin (15) am besten durch Erhitzen von N-(Diphenylmethylen)methoxymethylamin (14) mit Diphenylketimin in Gegenwart von Tetrafluoroborsäure zu gewinnen. N1,N2-Bis(diphenylmethylen)benzylidendiamine 17 sind durch säurekatalysierte Umsetzung der Acetale 16 und Diphenylketimin zugänglich.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 381-386 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diarylketimine N,O- and N,S-AcetalsReaction of diphenylketimine and α-chloroethers affords N-(diphenylmethylene)-1-alkoxy-alkylamines 1. N-(Diarylmethylene)methoxymethylamines 5a-5d substituted in position 4 of one benzene ring, are obtained as E- and Z-isomers. A propeller-type twisted conformation is assigned to the 2-substituted derivative 6. Protonation or methylation of the N,O-acetal 1a yields the iminium cations 2 and 3, respectively. Heating in the presence of thiols and tetrafluoroboric acid as catalyst affords N-(diphenylmethylene)alkylthio- or N-(diphenylmethylene)-arylthiomethylamines 7.
    Notes: Aus Diphenylketimin und α-Chlorethern entstehen N-(Diphenylmethylen)-1-alkoxyalkylamine 1. Die in 4-Stellung eines Benzolkerns substituierten N-(Diarylmethylen)methoxy-methylamine 5a-5d fallen in E- und Z-Formen an, während dem 2-substituierten Derivat 6 eine propellerartig verdrillte Konformation zugeschrieben wird. Aus dem N,O-Acetal 1a entstehen durch Protonierung oder Methylierung die Iminiumkationen 2 bzw. 3 und ddurch Erhitzen mit Thiolen und Tetrafluoroborsäure als Katalysator N-(Diphenylmethylen)alkylthio- oder N-(Diphenylmethylen)arylthiomethylamine 7.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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