Synthesis and spectroscopic and structural studies of cross-conjugated dienones derived from cyclic ketones and aromatic aldehydes
作者:S. Z. Vatsadze、M. A. Manaenkova、N. V. Sviridenkova、N. V. Zyk、D. P. Krut’ko、A. V. Churakov、M. Yu. Antipin、J. A. K. Howard、H. Lang
DOI:10.1007/s11172-006-0397-6
日期:2006.7
Cross-conjugated dienones were synthesized by the reactions of cyclic ketones with two equivalents of aromatic aldehydes under basic conditions. An NMR spectroscopic study and X-ray diffraction analysis demonstrated that all reaction products are formed as E,E isomers. Spontaneous photochemical trans-cis isomerization of cross-conjugated dienones under the scattered light in solution was observed for
交叉共轭二烯酮是通过环状酮与两当量的芳香醛在碱性条件下反应合成的。NMR 光谱研究和 X 射线衍射分析表明,所有反应产物均以 E、E 异构体的形式形成。首次观察到溶液中散射光下交叉共轭二烯酮的自发光化学反顺异构化。异构化程度主要取决于二烯酮分子中心片段的性质。合成了以前未知的 2,5-双 [(E)-(3-吡啶基) 亚甲基] 环戊酮的光化学 [2+2]-环加成产物,并通过光谱方法和 X 射线衍射进行了表征。在所使用的条件下,仅获得环丁烷加合物的一种异构体。