configurations of which were determined by means of1H NMR spectroscopy. In some cases the formation of cyclic dienes is impeded by the competing process of decarboxylation of acidic ylidenemalonates. The derivatives of 4,6-diphenyl-1,3-cyclohexadienecarboxylic acid were shown to be convenient precursors for the preparation ofmeta-terphenyls.
摘要 3-甲基-和3-苯基-
2-丁烯醛与亚烷基-、亚链烯基-和芳基亚
甲基丙二酸的单酯在
哌啶作为催化剂的存在下反应得到4,6-二取代的
1,3-环己二烯羧酸在23 –96% 的产量。在相同条件下,亚
环己基乙醛与
异戊二烯-和
亚苄基丙二酸的单酯反应,得到 1,5,6,7,8,8a 1-取代烷基的 1,8a-反式和 1,8a-顺式异构体的混合物-六氢化
萘-2-
羧酸盐,其比例和构型通过 1 H NMR光谱测定。在某些情况下,环状二烯的形成受到酸性亚亚基
丙二酸酯脱羧的竞争过程的阻碍。4,6
-二苯基-1的衍
生物,