Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1975-1979  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 639-649 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemistry of 1,2,4-Triazepines, XIV. - Condensations of β-Dicarbonyl Compounds with 1,2-Diaminoimidazoles
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 1002-1017 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectra of 49 1,2,4-triazines with oxo, thioxo, methoxy and methylmercapto groups in the 3 and 5 positions are reported and analysed. Five distinct patterns have been observed upon electron impact but an initial loss of N2 has not been identified. A tautomeric equilibrium has been shown to occur in the vapour phase from some fragmentation pathways.
    Notes: Les spectres de masse de 49 triazines-1,2,4 différemment substituées en position 6, possédant les groupes oxo, thioxo, méthylmercapto en position 3 et 5 et de leurs dérivés N-méthylés sont décrits. Cinq processus de fragementation du cycle traizine, liés á la structure et notamment á la nature du groupement fonctionnel en position 5 sont mis en évidence. L'un d'eux, engageant les ruptures des liaisons N-1—N-2 et C-5—C-6, est identifié dans tous les cas. Les pertes d'azote et de monoxyde de carbone ne sont pas observées. Pour certains composés la participation á l'équilibre, á l'état vapeur, de certaines formes tautoméres a été discutée.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1977), S. 136-144 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectra of 21 1,4-pyrazolo[3,4-b]diazepines are reported and analysed. Each of the five structures of the diazepine ring present is characterized by a particular group of fragmentations; among them one is common to all the compounds under study: the cleavage of C-5—C-6 and C-7—N-8 bonds leading to pyrazoloimidazoles ions.
    Notes: Les spectres de masse de 21 pyrazolo[3,4-b]diazépines-1,4 dans lesquelles le cycle diazépine peut présenter cinq structures différentes, sont décrits et analysis. Chaque structure a été caractérisée par un ensemble original de ruptures. Parmi celles-ci un mode de fragmentation commun à tous les composés étudiés a été identifié: il s'agit de la rupture des liaisons C-5—C-6 et C-7—N-8 avec formation d'ions pyrazoloimidazoles.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectra of several pyrido [2,3-b] and [3,4-b], pyrimido [4,5-b], pyrazolo [3,4-b] diazepinones-1,4 and as-triazino [4,3-b], s-triazolo [4,3-b]triazepinones-1,2,4 are reported and analysed. Five different fragmentation pathways of the molecular ion are generally observed, but the main one is an initial loss of CH2CO which gives rise to 2-methylazabenzimidazole or 2-methyl azabenzotriazole ions. The behaviour of triazolotriazepines which have two further fragmentation pathways is described.
    Notes: Les spectres de masse des pyrido[2,3-b], pyrimido[3,4-b], pyrimido [4,5-b], pyrazolo[3,4-b]- diazépinones-1,4 et des as-triazino[4,3-b] et s-triazolo[4,3-b]triazépinones-1,2,4 sont décrits et analysés. Cinq processus de fragmentation de l'ion moléculaire sont le plus souvent identifiés, le mode principal d déradation étant l'expulsion d'une moléule de cétène avec formation des ions méthyl-2 azabenzimidazoles ou méthyl-2 azabenzotriazoles. Le comprotement particulier des triazolotriazépines, présentant deux antres types de rupture, est mis en évidence.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...