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Nucleophilic Substitution on 4-Nitro- and 4-Methoxy-3-pyridinecarboxylic Acid-1-oxides

19.02.2004 | Svatava Voltrová, Viktor Prutianov, Molecules Online, 2004

1-Oxides of 4-nitro-3-pyridinecarboxylic acid (3) and methyl 4-methoxy-3-pyridinecarboxylate (5) were converted to 4-(diphenylmethyl)amino (7), 4-phenylthio (8), 4-phenylamino (9) and 4-(2-methylpropyl)-amino (6) derivatives by reaction with the corresponding nucleophiles. The 4-phenylamino ...

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Thermal Rearrangement of 4-Alkyl-1,2,4-triazoles. Rearrangements in the Crystalline State

19.02.2004 | Per Carlsen, Odd R. Gautun, Kåre B. Jørgensen, Molecules Online, 2004

Studies of the thermolyses of 4-alkyl substituted 1,2,4-triazoles was reviewed. They were observed to rearrange at 200-350 °C to the corresponding 1-alkylated triazoles. When substituted in the 4-position with aryl- or vinylic substituents the triazoles were inert to thermolysis, contrary to ...

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Contraction of Substituted 3,7-Diphenyl-5,6-dihydro-4H-1,2-diazepines to 3,6-Diphenylpyridazine

19.02.2004 | Milan Potácek, David Vetchý, Eduard Novácek, Ivana Císarová, Jaroslav Podlaha, Molecules Online, 2004

P-Bromoacetophenone azine (1) in the reaction with carbanions from malononitrile and ethyl cyanoacetate under mild conditions afforded, instead of the expected double substituted derivatives of acetophenone, azine cyclic 5,5-disubstituted 3,7-diphenyl-5,6-dihydro-4H-1,2-diazepines (2a,b). ...

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Syntheses of Some New Five-Membered Heterocycles Containing Selenium and Tellurium

19.02.2004 | Jirí Šibor, Pavel Pazdera, Molecules Online, 2004

The syntheses of some new chalcogenazole 1 and chalcogenophene 2, 3 derivatives under conventional Gewald's conditions [1-4], by the action of ultrasound and focused microwave irradiation is reported. It was found that although ultrasound accelerated the described reaction significantly, the ...

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Hydrazine-Derived Heterocycles by Conversion of Azo-alkenes

19.02.2004 | Joachim G. Schantl, Molecules Online, 2004

This lecture presents and, in part, reviews our work in the area of heterocyclic compounds I or II incorporating a hydrazine moiety. Content Type Journal Article Pages 212-222 Authors Joachim G. Schantl, Institut für Organische Chemie, Universität Innsbruck, Innrain 52a, A-6020 ...

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Some Cyclisations of N-(o-Nitrophenyl)amino Acid Esters

19.02.2004 | Colin S. French, David M. Smith, Molecules Online, 2004

The N-(o-nitrophenyl) derivatives of glycine and sarcosine esters 1a and 1b are cyclised in basic media to benzimidazole N-oxides 2 and 1-hydroxyquinoxaline-2,3-diones 3 respectively. Since the formation of the hydroxyquinoxalinedione is anomalous given the previously accepted mechanism for ...

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Pyrazino-O-Quinodimethanes from Pyrazine-Fused 3-Sulfolenes

19.02.2004 | Ta-shue Chou, Chung-Wen Ko, Molecules Online, 2004

We have developed a simple one-pot reaction to synthesize pyrazino-3-sulfolenes 7a-c. The synthesis was accomplished by treating a mixture of an !-dicarbonyl 14a-c and 3,4-diazido-2-sulfolene 13 in the presence of PPh3. The corresponding o-quinodimethanes were generated by thermolysis of ...

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Microplate Standardization

19.02.2004 | Thomas W. Astle, Molecules Online, 2004

The increased use of mechanical systems, such as stackers, infeed/outfeed mechanisms, and robotic hands, to handle 96-well microplates has emphasized the need of a dimensional standard. Mechanical methods are far less tolerant of dimensional variations than manual methods. The result is less ...

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Protonation of 6a?4-Thia-1,6-diazapentalenes

19.02.2004 | Barbara Friedrich, Annett Fuchs, Mathias Findeisen, Bärbel Schulze, Molecules Online, 2004

The synthesis of the new thiadiazapentalenes 4a-e starting from isothiazolium salts with active 5-methyl and 5-methylene groups with dicyclohexylamine is described. The ring opening products of the protonation of thiazapentalene were examined by NMR-experiments. Content Type Journal ...

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