Die Richtung der durch Quecksilbersalze katalysierten Addition von Wasser oder Methanol an die eine oder andere Doppelbindung von Allenalkoholen hängt von Grad und Stelle der Substitution des Allensystems ebenso wie von der Natur des verwendeten Quecksilbersalzes ab.
Synthesis of isomeric N-alkyl-3,4,5-trisubstituted pyrazoles are described from reaction of 3(2H)-furanones with alkylhydrazines or alternatively by alkylation of corresponding N-unsubstituted pyrazoles. Their structures are unambiguously established by 'H and 13C NMR studies. By comparison of the data of the N-alkylpyrazoles with those of the N-unsubstituted pyrazoles, the 5-methyl and 5-phenyl structures were found as the predominant form for these pyrazoles.Recently, we have reported that the 3(2H) -furanones are interesting substrates which undergo ring opening by nucleophilic reagents, leading to new cyclic c o m p o~n d s . l -~ Our studies concerning the reaction of hydrazine hydrate with 3(2H)-furanones 1-4 have led to a useful procedure to obtain Trialkylketenimines were prepared by reaction of a-cyano enamines w i t h methylmagnesium iodide in ethereal solution. Condensation of trialkylketenimines w i t h p r i m a r y amines afforded the corresponding amidines.
Die Ketoester (I) lassen sich mit den Chloracylchloriden (II) (analog auch mit entsprechenden α‐Acetoxy‐acylchloriden) in Gegenwart "von Mg‐äthylat in Benzol bei 10°C zu den Äthoxycarbonyldihydrofuranonen (III) umsetzen.
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