Light-Induced and Thermal π-Skeletal Rearrangement of Heptalenes with Retention of Configuration
作者:Werner Bernhard、Paul Brügger、Peter Schönholzer、Roland H. Weber、Hans-Jürgen Hansen
DOI:10.1002/hlca.19850680216
日期:1985.3.27
(tert-butyl)-5,6,10-trimethylheptalene-1, 2-dicarboxylate (5), and their derivatives rearrange reversibly on irradiation or on heating to yield the corresponding 1,6,8,10-tetramethyl- (4) and 8-(tert-butyl)-1,6,10-trimethylheptalene-1,2-dicarboxylate (6), and their derivatives by double-bond shift (π-skeletal rearrangement) via a transition state with D2 symmetry as the highest possible one. This follows
结果表明,5、6、8、10-四甲基-二甲基(3)和8,(叔丁基)-5,6,10-三甲基庚二烯-1,2-二羧酸酯(5)及其衍生物在甲基上可逆地重排。辐射或加热产生相应的1,6,8,10-四甲基-(4)和8-(叔丁基)-1,6,10-三甲基庚二烯-1,2-二羧酸酯(6)及其衍生物通过双键移位(π-骨架重排)通过与过渡状态d 2对称性最高可能的一个。这是由于以下事实:(-)-(P)-3被光化学和热重排以得到(-)-(P)-4,即,在保持庚烯骨架的构型且不损失光学纯度的情况下,发生π-骨架重排。