Search results for "Diazomethane"

showing 3 items of 13 documents

Über makrozwitterionen, 10. Versuche zur darstellung von makrozwitterionen aus α,ω-bifunktionellem poly(α-methylstyrol)

1975

Verschiedene Moglichkeiten zur Darstellung von Makrozwitterionen ohne polare Gruppen in der Polymerkette werden diskutiert. Unter Verwendung von 3-Dimethylaminopropyllithium als Initiator und Propansulton (2) als Kettenabbruchreagenz wurden α,ω-bifunktionelle Poly(α-methylstyrol)e 4 mit einer tert. Amino- und einer Lithiumsulfonat-Endgruppe (Molekulargewichtsbereich ≈ 103; Bifunktionalitat >90%) dargestellt. Die beiden Endgruppen wurden wie bei den entsprechenden monofunktionellen Polymeren analytisch (N,S) und spektroskopisch (IR und NMR) nachgewiesen. Obwohl die beiden Endgruppen der bifunktionellen Polymeren jeweils unabhangig in die freie Sulfonsaure-Gruppe bzw. in die Trimethylammonium…

chemistry.chemical_compoundEnd-groupBetainechemistryDiazomethanePolymer chemistryAmmoniumBifunctionalWeight rangeAmmonium iodideStyreneDie Makromolekulare Chemie
researchProduct

Synthesis and spectroscopic characterizations of both 1-ethyl-4,8-dihydro-10-methoxy-3-methyl-8-r1-6-r2-dipyrazolo[3,4-b:4′,3′-f]-[1,5]diazocin-5(1H)…

1995

The non-selective methylation of compounds 3a-d using ethereal diazomethane, allowed the synthesis of isomers 4 and 5 which were useful intermediates for the preparation, by a simple approach, of the title compounds 7 and 9. A complete assignment of the chemical shifts to the carbon atoms of the compounds 7 and 9 was performed by different nmr experiments, such as DEPT and XHDEPT for onebond CH correlations and COLOC experiments for long-range C-H correlations.

chemistry.chemical_compoundchemistryDiazomethaneChemical shiftOrganic Chemistrychemistry.chemical_elementMethylationDEPTMedicinal chemistryCarbonJournal of Heterocyclic Chemistry
researchProduct

Zur Reaktion von ?Pyrazolonblau? mit Diazomethan

1989

About the Reaction of „Pyrazolone Blue” with Diazomethane The reaction of “pyrazolone blue” with diazomethane was investigated. A pyridazinone derivative 3, a heterocyclic spiro-cyclopropyl product 4 and a compound 7, which contains three pyrazolone and two diazomethane entities, are formed. 3 reacts with an excess of diazomethane to the methoxy derivative 6. The spiro-cyclopropyl compound 4 is not stable and isomerizes to the corresponding 4,4′-methylidene-bispyrazolone 5. The structures of the products were established by spectroscopic methods and X-ray analysis.

chemistry.chemical_compoundchemistryDiazomethanePyrazolonemedicineOrganic chemistryDerivative (chemistry)medicine.drugJournal f�r Praktische Chemie
researchProduct