Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Klaus Kirschke"'
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 101:61-64
Instead of substitution, 4-halo-pyrazolones undergo ring opening to azo-olefins (2, 12, 16) on reaction with nucleophiles. Attempted Hofmann degradation of N-Haloamides 4 has to compete with either ring closure, involving NHCl-shift to 7, or formatio
Autor:
Erich Dr Wolff, Klaus Kirschke
Publikováno v:
Journal f�r Praktische Chemie/Chemiker-Zeitung. 337:405-408
Publikováno v:
Liebigs Annalen der Chemie. 1994:1037-1042
Selective Acylations of 3(5)-Alkyl-5(3)-amino-1H-pyrazoles and a New Pyrazolo[5,1-c]-1,2,4-triazole Synthesis (Z)-5-Amino-1-[1-(hydroximino)alkyl]-1H-pyrazoles 3 have been synthesized by acylation of 3(5)-alkyl-5(3)-amino-1H-pyrazoles 1 with nitrile
Publikováno v:
Liebigs Annalen der Chemie. 1994:877-880
Rubidium-Selective Chromoionophores with N-(Arylazoalkenoyl)azacoronand Structure The N-(arylazoalkenoyl)azacoronands 2a–2c have been synthesized by ring-opening reaction of the dichloropyrazolin-5(4H)-one 1 with the corresponding azacrowns. The st
Publikováno v:
Liebigs Annalen der Chemie. 1994:265-268
Lithium-Selective Chromoionophores of Arylazobutenoate Type New lithium-selective chromoionophoric compounds with arylazobutenoic acid structure have been synthesized from dichlorodihydropyrazole 2. The (E,E) isomers of esters of the arylazobutenoic
Publikováno v:
Liebigs Annalen der Chemie. 1994:159-165
Ring Transformations of 1-Oxa-5,6-diazaspiro[2.4]hept-6-en-4-ones into 4,5-Dihydro-4-hydroxy-1H-pyrazole-4-carboxylic Acid Derivatives Spiro epoxides 3 were synthesized from 1H-pyrazol-5(4H)-ones 1 by Knoevenagel condensation with acetone or benzalde
Publikováno v:
Journal f�r Praktische Chemie/Chemiker-Zeitung. 335:616-622
1-Arylimino-pyrazole Betaines, Pyrazoles and 1,2,4-Triazines from 3-Arylazo-propenoic Acid N-Chloramides Reaction of 3-arylazo-propenoic acid amides 5 with NaOCl yields N-chloroamides 6 which give under alkaline conditions 1,2,4-triazines 9 and 10 (p
Publikováno v:
Journal f�r Praktische Chemie/Chemiker-Zeitung. 335:169-175
Ring Transformations of Pyrazolinones via Azoolefins – a New Way to the 1,2,3-Thiadiazol-System Elektrophilic attack of thiocyanate/bromine to azoenamine (2a) yields thiocyanato compound 3a which cyclizes into 1,2,3-thiadiazolium-salt (5a) on treat
Publikováno v:
Journal f�r Praktische Chemie. 332:143-147
Pyrroles from Methyl 3-Amino-3-arylazo-propenoat and α-Halogenocarbonyl Compounds and the Forming of the Pyrrolo[3.2-e][1,2,4]-triazin Ring System Methyl 3-amino-3-(2,4,6-trichlor-phenylazo)propenoat (2) and α-halogenocarbonyl compounds (4a–c) un
Publikováno v:
Zeitschrift für Chemie. 9:105-106