The Preparation and Structures of Several Cross-Conjugated Allenes (“Allenic Dendralenes”)
作者:Friedhelm Lehrich、Henning Hopf、Jörg Grunenberg
DOI:10.1002/ejoc.201001508
日期:2011.5
The cross-conjugated allenes ("allenic dendralenes") 2-allenylbuta-1,3-diene (2), 1,1-divinylallene (3, prepared here as the methyl derivative 49), and 1,1-diallenylethene (4) are prepared either by S N 2'-substitution processes from appropriate allenic or acetylenic precursors or by base-catalyzed isomerizations of propargylic substrates. Thermal elimination/isomerization routes to these highly unsaturated
交叉共轭的丙二烯(“allenic dendralenes”)2-allenylbuta-1,3-diene (2), 1,1-divinylallene (3, 此处制备为甲基衍生物 49) 和 1,1-diallenylethene (4)由合适的丙二烯或乙炔前体通过 SN 2'-取代过程或通过炔丙基底物的碱催化异构化制备。这些高度不饱和烃的热消除/异构化途径需要这些丙二烯进行二次转化的反应条件。新的低聚烯烃,其结构已通过 MP2 方法计算,是加成和异构化反应的有趣底物。