ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
  • Organic Chemistry  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 656-674 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Five-Membered Heterocycles, VI. - 3-Organylamino-1,3-thiazolin-2-ones and -2-thionesS-Potassium (N'-organylhydrazino)monothio- and potassium (N-organylhydrazino)dithioformates 1A and 1B are alkylated at the mercapto sulfur atom with α-halo ketones to form the acylmethyl (hydrazino)thioformates 2 A and 2B, which can be obtained pure, or their cyclic derivatives 2'A and 2'B, respectively. In acidic solution these products are transformed into 3-organylamino-1,3-thiazolin-2-ones 3A or -2-thiones 3B, respectively. Proof for the five-membered ring structure comes from chemical reactions and UV spectroscopy. The syn-anti-diastereomeric S,S'-dialkyl dithiocarbonate tosylhydrazones Z-5 and E-5 have been prepared and their stereochemistry assigned.
    Notes: S-Kalium-[(N-organylhydrazino)monothio- und Kalium-[(N-organylhydrazino)dithioformiate] 1A bzw. 1B lassen sich mit α-Halogenketonen am Mercapto-Schwefel zu rein isolierbaren (Hydrazino)thioameisensäure-acylmethylestern 2Abzw. 2B oder deren cyclischen Derivaten 2'A bzw. 2'B alkylieren. Diese ergeben in saurer Lösung 3-Organylamino-1,3-thiazolin-2-one 3A bzw. -2-thione 3B. Der Beweis für das Vorliegen der fünfgliedrigen Ringstruktur wurde durch chemische Reaktionen und UV-spektroskopisch erbracht. Die syn-anti-diastereomeren Dithio-kohlensäure-S,S'-dialkylester-tosylhydrazone Z-5 und E-5 wurden hergestellt und zugeordnet.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 763 (1972), S. 46-52 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ring Cleavage of Cyclic Azo Compounds, V1). - 2-Mesityl-2H-benzo[c]-1.2-thiazet-1,1-dioxide, a Stable Benzo-β-sultamPhotolysis of 2-mesityl-2H-benzo[e]-1,2,3,4-thiatriazine-1,1-dioxide (3a) yields the stable 2-mesityl-2H-benzo[c]-1,2-thiazet-1,1-dioxide (4a), whilst irradiation of 2-phenyl-2H-benzo[e]-1,2,3,4-thiatriazine-1, 1-dioxide (3b) gives under similar reaction conditions carbazole (7) and the known dibenzo[c.e]-1,2-thiazine-1,1-dioxide (6).
    Notes: Die Photolyse des 2-Mesityl-2H-benzo[e]-1.2.3.4-thiatriazin-1.1-dioxids (3a) führt zu dem stabilen 2-Mesityl-2H-benzo[c]-1.2-thiazet-1.1-dioxid (4a). Dagegen ergibt das 2-Phenyl-2H-benzo[e]-1.2.3.4-thiatriazin-1.1-dioxid (3b) unter denselben Reaktionsbedingungen Carbazol (7) und Dibenzo[c.e]-1.2-thiazin-1.1-dioxid (6).
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 763 (1972), S. 39-45 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrolytic Ring-opening of Dimethyl Esters of 1-Cyclopropene-1,2-dicarboxylic AcidsThe cyclopropene esters 5 and 2 are converted to the 5-membered lactones 7 and 9 by boiling in CH3CO2H/H2O. In the case of 5 one minor by-product is the allyl acetate 8. In an attempt to synthesize 5 directly by photolysis of diphenyldiazomethane in the presence of dimethyl acetylenedicarboxylate in tetrahydrofurane as solvent, an adduct 10 containing 2 tetrahydrofuryl residues is formed.
    Notes: Die Cyclopropenester 5 und 2 lassen sich durch Kochen in Eisessig/Wasser in die 5-Ringlactone 7 bzw. 9 überführen, wobei als Nebenprodukt aus 5 das substituierte Allylacetat 8 entsteht. Beim Versuch, 5 direkt durch Photolyse von Diphenyldiazomethan in Gegenwart von Acetylendicarbonsäuredimethylester und Tetrahydrofuran als Lösungsmittel zu erhalten, entstand unter Einbau von zwei Tetrahydrofuran-Molekülen das Addukt 10.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ring-Fission of Cyclic Azo Compounds, VII1). - 6-Fluoro- and 6-Nitro-3-phenyl-3,4-dihydro-1,2,3-benzotriazin-4-one and their Photolysis; Nucleophilic Substitution as a Test of Suschitzky's Fluorine Labelling MethodThe photolysis of the fluorine- and nitro-substituted benzotriazinones 1a, 1b was investigated with a view to obtaining direct proof of the diazonium intermediate 2β. The products 3, 4, 5, 6 and 7 substituted at C-6 correspond to those reported previously to occur in the photolysis of the unsubstituted benzotriazinone 1c, whereas the compounds 1d-1h are formed by interactions of 1a and amines or methanolate in dark reactions. The fluorine-substitution occurs according to scheme 2 (route a), and not with the intermediacy of an intramolecular diazonium anilide ion pair (route b). Reasons which make it unlikely that the diazonium anilide ion pair 2β is involved in the photofragmentation reaction of 1 are reported.
    Notes: Die Photolyse der fluor- und nitrosubstituierten Benzotriazinone 1a bzw. 1b wurde im Hinblick auf einen direkten Nachweis der Diazoniumzwischenstufe 2β untersucht. Die am C-6 substituierten Produkte 3, 4, 5, 6 und 7 entsprechen denjenigen, über die kürzlich als Photolyseprodukte der unsubstituierten Verbindung 1c berichtet wurde. Die Produkte 1d-1h entstammen dagegen einer Dunkelreaktion von 1a mit Aminen oder Methylat. Die Fluorsubstitution erfolgt gemäß Schema 2, Weg a und nicht über ein intramolekulares Diazoniumanilid-Ionenpaar 2βa (Weg b). Gründe, die es unwahrscheinlich machen, daß bei der Photofragmentierung von 1 das Diazoniumanilid-Ionenpaar 2β auftritt, werden genannt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Five-Membered Heterocycles, IV.  -  Ring Contraction of 5-Aryl-6H-1,3,4-thiadiazin-2(3H)- ones to 4-Aryl-1,2,3-thiadiazoles5-Aryl-6H-1,3,4-thiadiazin-2(3H)-ones 3α have been prepared via two different routes (A and B). Oxidation with chlorine-containing tert-butyl hypochlorite led via ring contraction and extrusion of carbon dioxide to the 4-aryl-1,2,3-thiadiazoles 9.
    Notes: 5-Aryl-6H-1,3,4-thiadiazin-2(3H)-one 3α wurden auf zwei verschiedenen Wegen (A und B) dargestellt. Die Oxidation mit chlorhaltigem tert-Butylhypochlorit führte unter Ringverengung und Abspaltung von Kohlendioxid zu den 4-Aryl-1,2,3-thiadiazolen 9.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bis-acetylenic Compounds, III1)o-Bis-ethinyl-benzenes carrying different substituents undergo a photochemical reaction that yields the dimers 1-5. The dimers are asymmetric. Common to all of them is an azulenic system. Taking into account the chemical and physical properties of 1-5 and by means of calculations some possible structures are discussed.
    Notes: Verschiedenartig substituierte o-Diäthinyl-benzole gehen eine photochemische Reaktion ein, die zu den Dimeren 1-5 führt. Die Dimeren enthalten ein Azulen-System und sind unsymmetrisch aufgebaut. Anhand der physikalischen und chemischen Eigenschaften von 1-5 werden unter Zuhilfenahme von Berechnungen verschiedene Strukturmöglichkeiten diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...