1,3-烯丙基二羧酸(点组C 1)的两个羧酸酯官能团呈90°角排列,其对称性不同于通常用作配位聚合物或MOF中的连接基化合物的所有其他二羧酸。本文首次报道了带有1,3-烯丙基二羧酸二价阴离子的配位化合物的晶体结构。用金属碳酸盐M 2 CO 3转化二酸提供结晶的锂,钠,rub,铯和th(I)化合物。在固态下,它们的结构明显不同。常见的基序是二价阴离子,它通过阳离子连接到圆柱,层或链上。钠化合物表现出不同寻常的结构特征:三种晶体学不同的钠离子之一以跷跷板几何形状配位到四个而不是六个氧原子,即未占据两个八面体配位的赤道位置。因此,几乎是线性的(179°)O-Na-O单元包含两个具有垂直几何形状(角度为94°和95°)的辅助氧原子。
Optically active (R)- and (S)- allene-1,3-dicarboxylates were prepared, and their asymmetric Diels-Alderreactions with cyclopentadiene in the presence of Lewis acid proceeded to afford the endo-adducts in high yields.
Optically active allene-1,3-dicarboxylates (1a and 2a), which contain the axial asymmetry of the allene moiety, were prepared. The Diels-Alder reaction of 1a and 2a with cyclopentadiene afforded the 1:1 (1a or 2a to cyclopentadiene) endo adducts 3a and 4a through the combination of the sterically favorable approach of the diene and the dienophile owing to the axial asymmetry of the allene moiety and the effective secondary orbital interaction. The absolute configurations of 3a and 4a were determined by chemical transformation and X-ray analysis. The absolute configuration of the axial asymmetry of la was also determined to be R by X-ray analysis.
Malachowski; Kalinski, Roczniki Chemii, 1926, vol. 6, p. 769,773