通过与2,4-双(二乙基氨基)苯甲醛和酯(包括乙酸乙酯,丙二酸二乙酯和丙二酸二叔丁酯)进行羟醛缩合反应,制备了三种用于自由基可见光引发剂(CA)的新型可光漂白肉桂酰基染料还制备了-(4-(二苯基氨基)亚苄基)丙二酸酯(TA)。其结构通过1 H NMR确证,1313 C NMR,HR-MS。通过电子顺磁共振(EPR)分析和稳态光解实验,提出了由CAs和TA产生的自由基的机理。研究的CA和TA可以在LED @ 405 nm曝光下有效引发1,6-己二醇二丙烯酸酯(HDDA)的光聚合。在这些光引发剂中,CA-2表现出最佳的可见光光引发效率和光漂白特性。此外,当将CA-2用作光引发剂时,固化的HDDA聚合物中的残留引发剂被证明低至0.243%,并且获得的无色聚合物的厚度高达2.8mm。这些有效的可光漂白可见光引发剂在深度固化材料中显示出巨大潜力。
Avenues into the Synthesis of Illusive Poly(<i>m</i>-phenylene-<i>a</i><i>lt</i>-squaraine)s: Polycondensation of <i>m</i>-Phenylenediamines with Squaric Acid Intercepted by Intermediate Semisquaraines of Exceptionally Low Reactivity
作者:Marco A. Balbo Block、Anzar Khan、Stefan Hecht
DOI:10.1021/jo035399z
日期:2004.1.1
The synthesis and properties of a novel class of ortho-dialkylamino-substituted semisquaraines are described. The exceptionally low reactivity of the investigated compounds is caused by an intramolecularhydrogenbond as evidenced by experimental and computational studies. Although this constitutes the reason for our failed attempts to prepare poly(m-phenylene-alt-squaraine)s, the discovered influence
描述了新型的邻-二烷基氨基取代的半方胺的合成和性质。实验和计算研究证明,所研究化合物的异常低反应性是由分子内氢键引起的。尽管这构成了我们的失败的尝试的聚制备的原因(米-亚苯基- ALT -squaraine)类,氢键对这些半方酸菁的光物理性质的发现影响提供了一种用于传感器设计一个有前途的新基序。
Phenyljulolidinylphthalides
申请人:Sterling Drug Inc.
公开号:US04032527A1
公开(公告)日:1977-06-28
Substituted 3,3-diphenylphthalides, useful as color precursors, particularly in the art of pressure-sensitive duplicating systems, are prepared by condensing substituted 2-benzoylbenzoic acids with substituted anilines.
Substituted 3,3-diphenylphthalides, useful as color precursors, particularly in the art of pressure-sensitive duplicating systems and heat-sensitive marking systems, are prepared by condensing substituted 2-benzoylbenzoic acids with substituted anilines.
Enantioselective Three‐Component Coupling of Heteroarenes, Cycloalkenes and Propargylic Acetates
作者:Shenghan Teng、Yonggui Robin Chi、Jianrong Steve Zhou
DOI:10.1002/anie.202014781
日期:2021.2.23
heteroarenes including indoles, pyrroles, activated furans and thiophenes. 2,3‐Disubstituted tetrahydrofurans and pyrrolidines are produced in trans configuration and excellent enantiomeric ratios. The reaction proceeds via Wacker‐type attack of nucleophilic heteroarenes on alkenes activated by allenyl PdII species.
Palladium-catalyzed amination of aryl dibromides with secondary amines: synthetic and mechanistic aspects
作者:Irina P. Beletskaya、Alla G. Bessmertnykh、Roger Guilard
DOI:10.1016/s0040-4039(99)01246-0
日期:1999.8
Diaminobenzenes are obtained starting from m- and p-dibromobenzenes and secondary amines in the presence of Pd(dba)2/P(o-tolyl)3and sodium tert-butoxide in moderate to good yields. Reductive dehalogenation of aryl dibromides is a major side reaction under these conditions. The study of this reaction has shown that the formation of reductive dehalogenation products occurs according to two independent ways. The