Synthesis of 3-Methylthio-benzo[b]furans/Thiophenes via Intramolecular Cyclization of 2-Alkynylanisoles/Sulfides Mediated by DMSO/DMSO-d_(6) and SOCl_(2)

Main observation and conclusion The reaction of 2-alkynylanisoles/sulfides with SOCl_(2) and DMSO was conducted to conveniently furnish the biologically interesting 3-(methylthio)-benzo[b]furans/thiophenes via intramolecular cyclization.DMSO acts as a solvent as well as a sulfur source and can also be replaced with DMSO-d_(6),enabling the incorporation of the SCD3 moiety of DMSO-d_(6) to the 3-position of the heterocyclic frameworks.

Hydrothermal conversion of lignin and black liquor for phenolics with the aids of alkali and hydrogen donor

The potentials of phenolic productions from lignin and black liquor(BL)via hydrothermal technology with the aids of alkalis and hydrogen donors were investigated,by conducting batch experiments in micro-tube reactors with 300℃ sub-critical water as the solvent.The results showed that all the employed alkalis improved lignin degradation and thus phenolics production,and the strong alkalis additionally manifested deoxygenation to produce more phenolics free of methoxyl group(s).Relatively,hydrogen donors more visibly facilitated phenolics formation.Combination of strong alkali and hydrogen donors exhibited synergistically positive effects on producing phenolics(their total yield reaching 22 wt%)with high selectivities to phenolics,among which the yields of catechol and cresols respectively peaked 16 and 3.5 wt%.BL could be hydrothermally converted into phenolics at high yields(approaching 10 wt%with the yields of catechol and cresols of about 4 and 2 wt%,respectively)with the aids of its inherent alkali and hydrogen donors,justifying its cascade utilization.

PhlCl_(2)/NH_(4)SCN-Mediated Oxidative Regioselective Thiocyanation of Pyridin-2(1H)-ones

The reaction of pyridin-2(1H)·ones with PhlCl_(2) and NH_(4)SCN enables an efficient regioselective thiocyanation,leading to the synthesis of the biologically interesting C5 thiocyanated 2-pyridones in good to high yields.The mechanistic pathway of this metal-free approach is postulated to involve the formation of the reactive thiocyanogen chloride from the reaction of PhlCl_(2) and NH4SCN followed with the regioselective electrophilic thiocyanation of the pyridin-2(1H)-one ring.

Self-healable,Eu^(3+)-based polymeric gels containing terpyridyl groups with tunable luminescence based on ion recognition

Novel luminescent materials that change their emission colors in responding to external stimuli have attracted increasing attentions in the past decades.Herein,we report the preparation of a novel kind of Eu3+-based polymeric organogel with three networks.With dynamic coordination interactions,the organogel shows fast self-healing and adjustable fluorescent emission properties in the presence of different metal ions via coordination interaction competition effect.Dynamic coordination interaction also endows the gel with multiple stimuli-responsive properties such as water,base and acid.The multistimuli responsive fluorochromic organogel demonstrates a new way of preparing optical materials and bio-relevant sensors.