两种二烷基二酯三苯基鏻叶立德晶体结构的差异。
Differences in the crystal structures of two dialkyl diester triphenylphosphonium ylids.
作者信息
Castañeda Fernando, Jullian Carolina, Bunton Clifford A, Garland María Teresa, Baggio Ricardo
机构信息
Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago, Chile.
出版信息
Acta Crystallogr C. 2007 Apr;63(Pt 4):o267-70. doi: 10.1107/S0108270107010542. Epub 2007 Mar 31.
Hydrogen bonding and crystal packing play major roles in determining the conformations of ethyl methyl 2-(triphenylphosphoranylidene)malonate, Ph(3)P=C(CO(2)CH(3))CO(2)CH(2)CH(3) or C(24)H(23)O(4)P, (I), and dimethyl 2-(triphenylphosphoranylidene)malonate, Ph(3)P=C(CO(2)CH(3))(2) or C(23)H(21)O(4)P, (II). In (I), the acyl O atom of the ethyl ester group is anti to the P atom, while the O atom of the methyl ester group is syn. In (II), the dimethyl diester is a 1:1 mixture of anti-anti and syn-anti conformers.
氢键和晶体堆积在决定丙二酸二乙酯基-2-(三苯基磷亚基)甲酯（Ph(3)P=C(CO(2)CH(3))CO(2)CH(2)CH(3) 或 C(24)H(23)O(4)P，(I)）以及丙二酸二甲酯基-2-(三苯基磷亚基)甲酯（Ph(3)P=C(CO(2)CH(3))(2) 或 C(23)H(21)O(4)P，(II)）的构象中起主要作用。在 (I) 中，乙酯基团的酰基 O 原子与 P 原子呈反式，而甲酯基团的 O 原子呈顺式。在 (II) 中，丙二酸二甲酯是反-反式和顺-反式构象体的 1:1 混合物。
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