Synthesis of ?-cyclohexyl- and ?,?-alkylene-?,?-dicarbonyl-substituted dienes and study of their valence isomerization
作者:Zh. A. Krasnaya、V. S. Bogdanov、S. A. Burova、Yu. V. Smirnova
DOI:10.1007/bf00696716
日期:1995.11
ing α,β∶γ,δ-dienes. The structures of the reaction products were studied using1H NMR,13C NMR, and UV spectroscopy. The diene keto esters bearing no substituents at the γ-position were shown to be in fact three-component equilibrium mixtures comprised ofE- andZ-isomers of the diene (at the α,β bond) and a corresponding 2H-pyran. On the other hand, for keto esters with a Me group at the γ-position the
摘要 β-环己基丙烯醛、β-环己基异丁烯醛或α-环亚烷基链烷醛与乙酰乙酸甲酯或丙二酸二甲酯缩合得到δ-环己基-和δ,δ-亚烷基取代的α,α-二羰基α,β∶γ,δ-二烯。使用1H NMR、13C NMR和UV光谱研究了反应产物的结构。在γ-位不带取代基的二烯酮酯实际上是三组分平衡混合物,由二烯的E-和Z-异构体(在α,β键处)和相应的2H-吡喃组成。另一方面,对于在 γ 位具有 Me 基团的酮酯,平衡完全转移到 2H-吡喃。与酮酯相反,二烯二酯仅以开放形式存在。