Detailed experimental procedures are given for the preparation of the stereoisomeric (E)‐ and (Z)‐methyl‐α‐hydroxy and α‐methoxyimino‐4‐nitro‐1H‐imidazole‐1‐acetates and of the related acids. (Z)‐Isomers have been prepared by synthesis. (E)‐Isomers have been obtained only by photoisomerization. Decarboxylation of the acids left the corresponding aldehydes which are ideal compounds for structural studies and configurational assignments.
Durch Behandlung von 1‐(p‐Nitrophenyl) ‐2‐amino‐1,3‐propandiol mit aliphatischen Aldehyden oder Ketonen entstehen in 2‐Stellung mono‐ bzw. dialkylierte Oxazolidine.
Synthetic routes for the preparation of ethyl α‐hydroxyimino and α‐methoxyimino‐1‐methyl‐1H‐imidazole‐2‐acetate are reported. Separation and characterization of the double‐bond stereoisomers are described.
Durch Reaktion von Z‐Nerolidol (I) mit PBr3 entsteht ein Gemisch der isomeren Trien‐bromide (IIa) und (IIb), das mit Piperonylpiperazin (III) zu einem trennbaren Gemisch des Z,Z‐ (IVa) und E,Z‐Isomeren (IVb) umgesetzt wird.
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