Steric-Hindrance-Induced Regio- and Chemoselective Oxidation of Aromatic Amines
摘要:
Unusual regio- and chemoselective oxidation of aromatic amines hindered with ortho substituents (except -NH2, -NHCH3, and -OH) to the corresponding nitro compounds is described by use of nonanebis(peroxoic acid). The mechanistic investigation for selective oxidation of amines ortho-substituted with -NH2 or -OH showed the involvement of H-bonding between the ortho hydrogen of the adjacent -XH group (where X = NH, NR, or O) and an oxygen atom from the diperoxy acid. Various mono- and diamines are oxidized into corresponding mononitro derivatives in high yield and purity without employing any protection strategies. The protocol was also found to successful on the gram scale.
A mild and selective Cu(II) salts-catalyzed reduction of nitro, azo, azoxy, <i>N</i>-aryl hydroxylamine, nitroso, acid halide, ester, and azide compounds using hydrogen surrogacy of sodium borohydride
作者:Anirudhdha G. Kalola、Pratibha Prasad、Jaydeep A. Mokariya、Manish P. Patel
DOI:10.1080/00397911.2021.1983604
日期:2021.12.2
salt-based catalyst system utilizing the hydrogen surrogacy of sodiumborohydride for selective hydrogenation of a broad range of nitro substrates into the corresponding amine under habitancy of water or methanol like green solvents have been described. Moreover, this catalytic system can also activate various functional groups for hydride reduction within prompted time, with low catalyst-loading, without
摘要 第一个温和、原位、单锅、高收率、筛选良好的铜 (II) 盐基催化剂体系,利用硼氢化钠的氢替代作用,在存在于已经描述了水或甲醇之类的绿色溶剂。此外,该催化体系还可以在短时间内活化各种官能团进行氢化物还原,催化剂负载量低,无需高压或分子氢供应。值得注意的是,该系统探索了替代昂贵的传统加氢方法的巨大潜力,从而在有机合成领域提供了一种更绿色、更简单的加氢策略。
[EN] PARTICLES FOR ELECTROPHORETIC DISPLAYS<br/>[FR] PARTICULES POUR ÉCRANS D'AFFICHAGE ÉLECTROPHORÉTIQUES
申请人:MERCK PATENT GMBH
公开号:WO2012019704A1
公开(公告)日:2012-02-16
This invention relates to coloured polymer particles preferably with surface functionality for charge retention, a process for their preparation, the use of these particles for the preparation of an electrophoretic device, colour electrophoretic displays comprising such particle, and new polymerisable dyes.