and moisture‐stable, highly efficient ruthenium NNN pincer complex is reported for the first time to catalyze the tandem transformation of various aromatic and aliphatic nitro compounds into the corresponding N‐methylated amines in up to 98 % yield by using methanol as a green methylating agent. Gram‐scale reactions of challenging nitro substrates demonstrated the practical application aspects of this
Room temperature N-heterocyclic carbene manganese catalyzed selective <i>N</i>-alkylation of anilines with alcohols
作者:Ming Huang、Yukui Li、Yinwu Li、Jiahao Liu、Siwei Shu、Yan Liu、Zhuofeng Ke
DOI:10.1039/c9cc02989c
日期:——
The first example of room temperature non-noble metal homogeneous system catalyzedselective N-alkylation of anilines with alcohols by a bis-NHC manganese complex is presented. This system was applied to a large range of alcohols and anilines, including biologically relevant motifs and challenging methanol. Experimental and computational studies suggest an outer-sphere mechanism for this NHC–Mn system
Manganese-Catalyzed One-Pot Conversion of Nitroarenes into <i>N</i>
-Methylarylamines Using Methanol
作者:Benjamin G. Reed-Berendt、Nicolas Mast、Louis C. Morrill
DOI:10.1002/ejoc.201901854
日期:2020.3.8
A manganese‐catalyzed one‐pot conversion of nitroarenes into N‐methylarylamines has been developed. This transfer hydrogenation method employs a well‐defined bench stable Mn PN3P pincer precatalyst in combination with methanol as both the reductant and the C1 source. A selection of commercially available nitroarenes was converted into N‐methylarylamines in synthetically useful yields.
methanol for the selective methylation of aromaticamines with RuHCl(CO)(PNHP) (PNHP = bis(2-diphenylphosphinoethyl)amine) is reported. Various aromaticamines were transformed into their corresponding monomethylated secondary amines in high yields at 150 °C with a very low catalyst loading (0.02–0.1 mol %) in the presence of KOtBu (20–60 mol %). The catalyst precursor, RuHCl(CO)(PNHP), was converted
据报道,使用甲醇将芳香胺与RuHCl(CO)(PN H P)(PN H P =双(2-二苯基膦基乙基)胺)选择性甲基化。在KO t Bu(20-60 mol%)存在的情况下,各种芳香胺在150°C下以极低的催化剂负载量(0.02-0.1 mol%)以高收率转化成它们相应的单甲基化仲胺。将催化剂前体RuHCl(CO)(PN H P)转化为[RuH(CO)2(PN H P)] +在催化条件下,也可作为高效催化剂。即使在反应条件下(其中CO从甲醇中释放出来),该催化剂的坚固性也有助于其出色的催化活性。
Water-developable photosensitive composition and production process thereof
申请人:Nippon Paint Co., Ltd.
公开号:EP0859284A1
公开(公告)日:1998-08-19
The present invention provides a water-developable photosensitive composition capable of providing a flexographic printing plate with a satisfactory shelf life, excellent water developability, water resistance, ink resistance and aging resistance, as well as an adequate impact resilience necessary for a high evenness of the reproduced image, and a production process thereof.
A water-developable photosensitive composition comprising (A) a thermoplastic elastic polymer, (B) an ionic group- and photopolymerizable double bond-containing hydrophilic polymer, (C) a crosslinking particulate resin having an ionic group capable of forming an ion pair with said polymer (B), and (D) a photopolymerization initiator.