Valenzisomerisierung voncis-dienonen IV. Die vier stereoisomeren Formen von 4-Methyl-6-phenyl-3, 5-hexadien-2-on
作者:P. Schiess
DOI:10.1002/hlca.19720550711
日期:1972.11.1
(Z,Z)-4-Methyl-6-phenyl-3,5-hexadien-2-one (5) is converted to its (Z,E)-isomer 6 at 35° in the dark. This ready, uncatalysed cis,trans-isomerization is shown to proceed through 2H-pyran 9. Irradiation of either stereoisomeric dienone 6, 7 or 8 at 0° produces a photostationary mixture of 5, 6, 7 and 8 in which the (Z,Z)-isomer 5 predominates.
(Z,Z)-4-甲基-6-苯基-3,5-己二烯-2-酮(5)在黑暗中于35°转化为它的(Z,E)-异构体6。这种现成的,未催化的顺式,反式-异构化反应通过2 H-吡喃9进行。在0°照射立体异构体二烯酮6、7或8会生成5、6、7和8的光平稳混合物,其中(Z,Z)-异构体5占优势。