conditions. When this reaction was applied to dithiocarbamates ArN(R)CS2Me at higher temperatures, the trifluoromethylation was accompanied by halogen substitution at the p-position of the Ar group. The synthesis of trifluoromethyl-substituted adenosine is also described.
三氟甲胺很容易从二硫代氨基甲酸酯通过由四丁基二氢三氟化铵和 N-卤代酰亚胺组成的试剂系统在温和条件下合成。当该反应在较高温度下应用于二硫代氨基甲酸酯 ArN(R)CS2Me 时,三氟甲基化伴随着 Ar 基团对位的卤素取代。还描述了三氟甲基取代的腺苷的合成。
Syntheses and Properties of Novel Liquid Crystals Containing a Trifluoromethylamino Group
Liquid crystals (LCs) containing a trifluoromethylamino group are prepared by the cross-coupling reaction of p-bromo-substituted-(hetero)aryl(trifluoromethyl)amines that are derived from the corresponding dithiocarbamates through oxidative desulfurization–fluorination. The novel LCs are shown to exhibit mainly a smectic phase over a wide range of temperatures. Their electro-optical properties as a component of nematic LCs are compared with those of the corresponding methylamines.