在 180 °C 的 Ac2O/Et3N 中,α-萜品烯与对醌和 1,4-萘醌的每种加合物都会产生两种芳香族产物,其中一种具有独特的气味,是由于失去了一个乙烯基而形成的。在这里,我们报告了 (1RS, 4RS)-1-isopropyl-4-methyl-1,4-dihydro-1,4-ethanoanthracene-9,10-diyl diacetate 的晶体结构。它在正交空间群 Pbca 中结晶,晶胞尺寸 a = 10.2899(7), b = 19.7804(9), c = 19.7519(8) Å 和 Z = 8。根据其 NMR 和 X 射线衍射数据,异丙基和乙酸酯基团缓慢旋转。
在 180 °C 的 Ac2O/Et3N 中,α-萜品烯与对醌和 1,4-萘醌的每种加合物都会产生两种芳香族产物,其中一种具有独特的气味,是由于失去了一个乙烯基而形成的。在这里,我们报告了 (1RS, 4RS)-1-isopropyl-4-methyl-1,4-dihydro-1,4-ethanoanthracene-9,10-diyl diacetate 的晶体结构。它在正交空间群 Pbca 中结晶,晶胞尺寸 a = 10.2899(7), b = 19.7804(9), c = 19.7519(8) Å 和 Z = 8。根据其 NMR 和 X 射线衍射数据,异丙基和乙酸酯基团缓慢旋转。
Substrate Dependence in Aqueous Diels-Alder Reactions of Cyclohexadiene Derivatives with 1,4-Benzoquinone
作者:Takeshi Sunakawa、Chiaki Kuroda
DOI:10.3390/10010244
日期:——
A reactivity difference based on the position of substituents on cyclohexa-1,3- diene was observed for the title reaction. The effect of water as solvent was more distinct for 1-methyl-4-isopropylcyclohexa-1,3-diene than for 2-methyl-5-isopropylcyclohexa- 1,3-diene or non-substituted cyclohexa-1,3-diene. The effect of NaCl (salting-out) and guanidium chloride (salting-in) was also large for 1-methyl-4-isopropylcyclohexa-1,3- diene.