描述了一种基于1',3,3',4-四氢螺环[chromene-2,2'-吲哚]环系统的新型化学传感器,该化学传感器可高特异性地检测氰化物。这些化学传感器在氰化钠与磷酸钠缓冲的乙腈溶液中用氰化物处理时,会显示出明显的颜色变化,并且此过程不受其他常见阴离子的影响。化学传感器对低浓度的氰化物表现出高灵敏度,符合欧盟水质控制标准,灵敏度低于0.05 mg L -1,并在数十秒内显示出非常快的响应。通过氰化阴离子对吲哚啉C-2原子上的酚氧原子进行亲核取代,形成稳定的吲哚腈加合物,并生成有色的4-硝基酚盐发色团,从而合理地确定了检测机理。这些化学传感器可以通过简单的方法由市售的起始原料合成。
Iodine‐Promoted Domino Oxidative Cyclization for the One‐Pot Synthesis of Novel Fused Four‐Ring Quinoxaline Fluorophores by sp
<sup>3</sup>
C−H Functionalization
作者:Yong Zhang、Min Yang、Chengli Jia、Min Ji
DOI:10.1002/chem.201903688
日期:2019.10.28
A method for the synthesis of novel fused four-ring quinoxaline skeleton has been described by an I2 promoted sp3 C-H functionalization between 1,2,3,3-tetramethyl-3H-indolium iodides and 1,2-diamines. This transformation proceeds smoothly under metal- and peroxide-free conditions through a sequential iodination, oxidation, annulation and rearrangement. Moreover, 8,9-dichloro-5,12,12-trimethyl-2-(trifluoromethyl)-5
PHOTOCHROMISM. SYNTHESIS AND PROPERTIES OF INDOLINOSPIROBENZOTHIOPYRANS
作者:Sei’ichi Arakawa、Hirofumi Kondo、Jun’etsu Seto
DOI:10.1246/cl.1985.1805
日期:1985.12.5
Novel photochromic compounds, indolinospirobenzothiopyrans, were prepared and their properties in polymer films were examined. The absorption bands of the colored form lie around 100 nm deeper in the long-wave region of the spectrum than are the case with the common spiropyrans.
An enzymatic process for the efficient asymmetric reduction of 3H‐indoles as well as 3H‐indole iodides was developed for the first time. Using a new iminereductase identified fromPaenibacilluslactis (PlSIR), various chiralindolines were facilely synthesized in good yields and excellent enantiopurities (up to >99% ee) under mild reaction conditions.
Agent for dyeing fibers comprising an indoline/indolium derivative
申请人:——
公开号:US20030079301A1
公开(公告)日:2003-05-01
The object of the present invention is an agent for dyeing fibers obtained by mixing two components and characterized in that one component (component A2) contains at least one carbonyl compound and the other component (component A1) contains at least one indoline derivative of formula (I) or a 3H-indoline derivative of formula (Ia)
1
as well as a multicomponent kit for dyeing and later decolorizing fibers, said kit containing both an agent according to the invention for producing a coloration on the fiber and an agent for the reductive removal of said coloration.