A hydrogenbonddonorsolvent assisted (radio)halogenation and deuteration of organoborons has been developed. The reactions exhibited high functional group tolerance and needed only an ambient atmosphere. Most importantly, compared to literature methods, our conditions are more consistent with the principals of green chemistry (e.g., metal‐free, strong oxidant‐free, more straightforward conditions)
One/two-photon cationic polymerization in visible and near infrared ranges using two-branched sulfonium salts as efficient photoacid generators
作者:Xingyu Wu、Ming Jin、Jianchao Xie、Jean Pierre Malval、Decheng Wan
DOI:10.1016/j.dyepig.2016.06.023
日期:2016.10
compared with those in the corresponding mono-branched PAGs. Photochemicalmechanisms were investigated through UV–Vis spectra analysis, molecular orbital calculations, and fluorescence analysis. These novel two-branched D-π-A type sulfonium-based photoinitiating systems are efficient cationic photoinitiators (epoxide conversion = 70%–85% and vinyl conversion > 75%) even under conditions with low initiator
本文介绍了两个两支sulf基光致产酸剂(PAG)的合成和光化学行为。支链结构通过增加吸收波长和摩尔消光系数以及增强一/双光子照射下的产酸量,影响PAG的光学性能。两分支结构共同显示出高出两倍的H +与相应的单支PAG相比,具有更高的生产能力和改进的双光子吸收截面。通过UV-Vis光谱分析,分子轨道计算和荧光分析研究了光化学机理。这些新颖的两支D-π-A型sulf基光引发剂体系即使在引发剂浓度低(1 wt%)和固化的条件下,也是高效的阳离子光引发剂(环氧转化率= 70%–85%,乙烯基转化率> 75%)。暴露于可见光发光二极管(例如405 nm)时的光强度(5 mW cm -2)。这些双光子制造的微结构还具有作为阳离子双光子引发剂的潜力。
Biphenyl-substituted guanidine derivatives useful as hypoglycaemic agents
申请人:The Boots Company
公开号:US05302720A1
公开(公告)日:1994-04-12
Compounds of formula I ##STR1## and their salts in which R.sub.1 is optionally substituted phenyl, R.sub.2 is alkyl, cycloalkyl or optionally substituted amino, or R.sub.2 and R.sub.3 together with the nitrogen and carbon atoms to which they are attached form an optionally substituted heterocyclic ring or R.sub.3 and R.sub.4 together with the nitrogen atom to which they are attached form an optionally substituted heterocyclic ring and R.sub.5 is H, halo, alkyl, alkoxy, trifluoromethyl or a group of formula S(O).sub.m R.sub.8 in which m is 0, 1 or 2 and R.sub.8 is alkyl have utility in the treatment of diabetes particularly in the treatment of hyperglycaemia.
Copper-Catalyzed Synthesis of S-Aryl Dithiocarbamates from Tetraalkylthiuram Disulfides and Aryl Iodides in Water
作者:Xiang-mei Wu、Guo-bing Yan
DOI:10.1055/s-0037-1612086
日期:2019.3
An efficient approach for the copper-catalyzed synthesis of aryl dithiocarbamates from aryl iodides and tetraalkylthiuram disulfides in water is described. Without additional ligand and organic solvent, the coupling reaction could provide a series of S-aryl dithiocarbamates in moderate to good yields.
Copper-mediated sulfonylation of aryl iodides and bromides with arylsulfonyl hydrazides in PEG-400
作者:Xiangmei Wu、Yan Wang
DOI:10.1039/c8nj00075a
日期:——
Sulfonylation using stable and readily available arylsulfonyl hydrazides and aryliodides or bromides mediated by cupric acetate has been achieved. Using polyethyleneglycol (PEG-400) as an eco-friendly medium, the couplingreaction could afford a series of unsymmetrical diaryl sulfones in moderate to good yields without the presence of additional ligands and base.