Bromination of 2-pyrazolines and 3,4,5-trimethylpyrazole

doi:10.1016/0040-4020(66)80011-X

Paper

Bromination of 2-pyrazolines and 3,4,5-trimethylpyrazole

Published 1966 · G. Closs, H. Heyn

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Abstract

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Bromination of 2-pyrazolines produces 3-bromo-1-pyrazolines, while 3,4,5-trimethylpyrazole produces 3,4,5-trimethyl-4-bromo-4H-pyrazole, which undergoes bromide displacement in MeOH treatment.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

Bromination of 2-pyrazolines and 3,4,5-trimethylpyrazole

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References

Citations

Oxidation of N-Aminophthalimide in the Presence of Conjugated Azoalkenes: Azimines, Azoaziridines, and [1,2,3]Triazoles

N-aminophthalimide oxidation in the presence of conjugated azoalkenes produces azimines, azoaziridines, and [1,2,3]triazoles, with phthalimide (4) being the main product.

Oxidative addition ofN-aminophthalimide to conjugated azoalkenes. Synthesis of the first C-azoaziridines

The oxidation of N-aminophthalimide with lead tetraacetate in the presence of -phenylazostyrene or 1-phenylazocyclohexene leads to the first C-azoaziridines, with various regio and stereoisomeric

Reactions of alkali metal derivatives of metal carbonyls X. The nature of the product from the reaction between sodium tetracarbonylcobaltate(−1) and trimethylcyclopropenyl tetrafluoroborate☆

The yellow crystalline product from the reaction between sodium tetracarbonylcobaltate and trimethylcyclopropenyl tetrafluoroborate is a keto--cyclobutenyl derivative rather than a cyclopropenylcarbonyl derivative.

Structures of the pyrazolines obtained from tiglic aldehyde and methylhydrazine

The reaction for forming pyrazolines from unsaturated carbonyl compounds and hydrazines is not stereospecific and may involve unknown rearrangements.

The 4H-Pyrazoles

4H-pyrazoles are cyclic azines with diverse structural and physical properties, and can be synthesized using 2,2-disubstituted 1,3-diketones and hydrazine.

Synthèse de diméthyl-5,5 pyrazolénines, précurseurs de vinylcarbènes isoprénoïdes, par oxydation directe de Δ2-pyrazolines

Direct oxidation of 2-pyrazolines with manganese dioxide allows for the synthesis of valuable isoprenic vinylcarbene precursors without using a diazoalkane.