A one-pot synthesis of dialkyl 2-(dicyanomethyl)-3-(triphenyl-λ5-phosphoranylidene)succinates in fairly high yields by the reaction of malononitrile, dialkyl acetylenedicarboxylates and triphenylphosphine are reported. The formulas of these compounds were confirmed by IR, 1 H,31 P, and 13 C NMR spectroscopy. The NMR spectra indicated that solutions of the phosphorus ylides (CDCl3 as solvent) contain
据报道,通过
丙二腈、
乙炔二
羧酸二烷基酯和
三苯基膦的反应,以相当高的收率合成了二烷基 2-(二
氰基甲基)-3-(三苯基-λ5-亚膦基)
琥珀酸酯。这些化合物的分子式通过 IR、 1 H、 31 P 和 13 C NMR 光谱证实。核磁共振谱表明
磷叶立德溶液(CDCl3 作为溶剂)含有两个旋转异构体(E 和 Z)。由 1H NMR 光谱确定每个
磷叶立德在 CDCl3 中的旋转异构体的相对百分比。