Highly Soluble and Green Indigo Dyes: 4,4′,7,7′-Tetraalkoxy-5,5′-diaminoindigotins
作者:Gundula Voss、Michael Gradzielski、Jürgen Heinze、Helmut Reinke、Carlo Unverzagt
DOI:10.1002/hlca.200390156
日期:2003.6
polar resonance structures in the ground state. Tautomeric structures were excluded. These indigotins are valuable compounds for technical applications, for synthetic purposes, and for analytical studies. SANS (Small-angle neutron scattering) experiments showed that certain 4,4′,7,7′-tetraalkoxy-5,5′-diaminoindigotins 1 form rod-like aggregates in solution. The similarly substituted 4,4′,7,7′-tetraalkoxy-5
两个新类型的4,4',7,7'- tetraalkoxyindigotins,1A - ˚F和2A - ˚F与新沿着Ñ取代indigotins 4E - ˚F,从dinitrobenzaldehydes合成5A - ˚F,这是从2-羟基制备-5-甲氧基苯甲醛(7)经由dialkoxybenzaldehydes 6A - ˚F(方案)。从二烷氧基苯甲醛6g经由硝基苯甲醛8g获得新的二烷氧基靛蓝3g。分离出副产物1,4-二烷氧基-2,3-二硝基苯9。4,4',7,7'-四烷氧基-5,5'-二氨基靛蓝素1可溶于有机溶剂,其溶液呈绿色,这对靛蓝素极少见,主要是由取代基的电子效应,空间效应引起的扮演次要角色。靛蓝素1产生最长波长吸收的强烈红移和负溶剂溶变色,表明基态的极化共振结构占主导地位。互变异构结构被排除。这些靛蓝素是用于技术应用,合成目的和分析研究的有价值的化合物。SANS(小角中子散射)实验表明,某些4