The reaction of ortho-substituted aromatic azides with boron trichloride or trifluoride
作者:Piero Spagnolo、Paolo Zanirato
DOI:10.1039/p19880002615
日期:——
The reaction of borontrichloride or trifuoride with ortho-aryl, -diazoaryl, and -arylazoaryl phenyl azides in benzene at room temperature generally gives fused azoles in high yields. Treatment of 2-nitrophenyl azide with borontrichloride mainly affords chlorinated nitroanilines, whereas with borontrifluoride it gives N-o-nitrophenylaniline. In aromatic solvents at 60 °C in the presence of boron trifluoride–diethyl
N-2′,4′,6′-Trisubstituted 3-/4-substituted carbazole derivatives exist as mixtures of E-/Z-amide conformers. It was found that the ratio of the two conformers is controlled by the electronic properties of the 3-/4-substituents. The 3-ammonium-6-t-butyl-carbazole derivative 3s, in which the electronic character of each benzene ring of carbazole was properly tuned, provided the best preference for the
N -2',4',6'-三取代的3- / 4-取代的咔唑衍生物以E- / Z-酰胺构象异构体的混合物存在。发现两种构象异构体的比例受3- / 4-取代基的电子性质控制。咔唑的每个苯环的电子特性均经过适当调节的3-铵-6-叔丁基咔唑衍生物3s为Z-构象异构体提供了最佳选择(E:Z = 1:2.50)。
Keratin dyeing compounds, keratin dyeing compositions containing them, and use thereof
申请人:Glenn Wayne Robert
公开号:US20050217038A1
公开(公告)日:2005-10-06
Compositions for the oxidative dyeing of keratin fibers, comprising a medium suitable for dyeing and one or more tricyclic fused 6-5-6 heteroaromatic keratin dyeing compounds having one heteroatom. A method for oxidative dyeing of keratin fibers, comprising applying such compositions in the presence of an oxidizing agent, for a period sufficient to develop the desired coloration.
Keratin Dyeing Compounds, Keratin Dyeing Compositions Containing Them, And Use Thereof
申请人:Glenn Wayne Robert
公开号:US20080098535A1
公开(公告)日:2008-05-01
Compositions for the oxidative dyeing of keratin fibers, comprising a medium suitable for dyeing and one or more tricyclic fused 6-5-6 heteroaromatic keratin dyeing compounds having one heteroatom. A method for oxidative dyeing of keratin fibers, comprising applying such compositions in the presence of an oxidizing agent, for a period sufficient to develop the desired coloration.