scholarly journals Metal-free regioselective hydrochlorination of unactivated alkenes via a combined acid catalytic system

2018 ◽  
Vol 20 (3) ◽  
pp. 680-684 ◽  
Author(s):  
Shengzong Liang ◽  
Gerald B. Hammond ◽  
Bo Xu
Keyword(s):  
Acetic Acid ◽  
Catalytic System ◽  
Metal Free ◽  
System P ◽  
Wide Range

A combined acid HCl/DMPU-acetic acid catalytic system was used in the hydrochlorination of a wide range of unactivated alkenes.

Synthesis of renewable acetic acid from CO2and lignin over an ionic liquid-based catalytic system

2019 ◽  
Vol 55 (21) ◽  
pp. 3069-3072 ◽  
Author(s):  
Huan Wang ◽  
Yanfei Zhao ◽  
Zhengang Ke ◽  
Bo Yu ◽  
Ruipeng Li ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Acetic Acid ◽  
Catalytic System ◽  
System P ◽  
Bimetal Catalyst

Renewable acetic acid can be synthesized from CO2and lignin over an ionic liquid-based catalytic system containing Ru–Rh bimetal catalyst.

K2S2O8-mediated metal-free direct C–H functionalization of quinones using arylboronic acids

2015 ◽  
Vol 2 (12) ◽  
pp. 1616-1620 ◽  
Author(s):  
Andivelu Ilangovan ◽  
Ashok Polu ◽  
Gandhesiri Satish
Keyword(s):  
Catalytic System ◽  
Metal Free ◽  
Arylboronic Acids ◽  
System P

Direct C–H functionalization of quinones with arylboronic acids is achieved using K2S2O8 as the sole and efficient green catalytic system.

Metal- and radical-free aerobic oxidation of heteroaromatic methanes: an efficient synthesis of heteroaromatic aldehydes

2019 ◽  
Vol 17 (17) ◽  
pp. 4220-4224 ◽  
Author(s):  
Rongzi Ye ◽  
Yuanjie Cao ◽  
Xiaoxiang Xi ◽  
Long Liu ◽  
Tieqiao Chen
Keyword(s):  
Catalytic System ◽  
Aerobic Oxidation ◽  
Methyl Groups ◽  
Efficient Synthesis ◽  
Metal Free ◽  
System P

A metal-free and radical-free synthesis of heteroaromatic aldehydes was developed through aerobic oxidation of methyl groups in an I2/DMSO/O2 catalytic system.

DBU/benzyl bromide: an efficient catalytic system for the chemical fixation of CO2 into cyclic carbonates under metal- and solvent-free conditions

2016 ◽  
Vol 6 (11) ◽  
pp. 3872-3877 ◽  
Author(s):  
Lin Wang ◽  
Koichi Kodama ◽  
Takuji Hirose
Keyword(s):  
Catalytic System ◽  
Benzyl Bromide ◽  
Solvent Free ◽  
Chemical Fixation ◽  
Cyclic Carbonates ◽  
Metal Free ◽  
Solvent Free Conditions ◽  
Wide Range

A simple, mild and inexpensive catalytic system, DBU and benzyl bromide, was developed for the cycloaddition of epoxides to ambient CO2 under metal-free and solvent-free conditions and a wide range of epoxides was converted to the corresponding cyclic carbonates with good to excellent yields (81–95%).

p-Sulfonic acid calix[n]arene catalyzed synthesis of bioactive heterocycles: A review

2020 ◽  
Vol 24 ◽  
Author(s):  
Bubun Banerjee ◽  
Gurpreet Kaur ◽  
Navdeep Kaur
Keyword(s):  
Supramolecular Chemistry ◽  
Sulfonic Acid ◽  
Catalytic Efficiency ◽  
The Other ◽  
Reaction Conditions ◽  
Metal Free ◽  
Bioactive Scaffolds ◽  
Wide Range ◽  
Efficient Alternative ◽  
Bioactive Heterocycles

: Metal-free organocatalysts are becoming an important tool for the sustainable developments of various bioactive heterocycles. On the other hand, during last two decades, calix[n]arenes have been gaining considerable attention due to their wide range of applicability in the field of supramolecular chemistry. Recently, sulfonic acid functionalized calix[n] arenes are being employed as an efficient alternative catalyst for the synthesis of various bioactive scaffolds. In this review we have summarized the catalytic efficiency of p-sulfonic acid calix[n]arenes for the synthesis of diverse biologically promising scaffolds under various reaction conditions. There is no such review available in the literature showing the catalytic applicability of p-sulfonic acid calix[n]arenes. Therefore, we strongly believe that this review will surely attract those researchers who are interested about this fascinating organocatalyst.

Tracking development with Baby CROINC: The interplay of parent experience, usage, and technology approach (Preprint)

2018 ◽  
Author(s):  
Ayelet Ben-Sasson ◽  
Eli Ben-Sasson ◽  
Kayla Jacobs ◽  
Rotem Malinovitch
Keyword(s):  
Developmental Screening ◽  
Technology Competence ◽  
Proactive Approach ◽  
Crowd Wisdom ◽  
System P ◽  
Parent Experience ◽  
Wide Range ◽  
Actual Use ◽  
Perceived Usability ◽  
Crowd Intelligence

BACKGROUND To lower barriers to developmental screening, we designed Baby CROINC (CROwd INtelligence Curation), a digital platform to help parents track and assess their children’s development through crowd wisdom. OBJECTIVE To understand users’ experiences using Baby CROINC in relation to users’ technological competence and attitudes, while considering the influence of their children’s presented developmental evaluations and parents’ actual use of the system. METHODS Mothers of 260 children (M age= 17.6 months, SD=13.7) used Baby CROINC for two weeks. They entered developmental milestones on their children’s developmental diary timeline and received statistical developmental percentile reports. Mothers then completed Usability and Technology Profile Questionnaires. RESULTS Mothers’ experiences of the Baby CROINC system usability were associated with their attitudes toward solving technological problems, mediated by frequency of engagement in Internet activities. Mothers with a proactive approach toward solving technology problems, engage in a wide range of Internet activities, and/or view the Internet as integral to their lives had a better experience with Baby CROINC than mothers who did not. The system’s perceived usability was not associated with the crowd-based child developmental percentiles or quantity of mothers’ usage of the system. CONCLUSIONS Parent’s user experiences correlate with their technology competence and problem solving attitude but is not correlated with their child’s developmental status. Developmental screening platforms need to solve the tension between requiring active engagement and encouraging proactive parenting.

Metal free decarboxylative aminoxylation of carboxylic acids using a biphasic solvent system

2021 ◽  
Vol 19 (1) ◽  
pp. 273-278
Author(s):  
Göran Schulz ◽  
Andreas Kirschning
Keyword(s):  
Carboxylic Acids ◽  
Solvent System ◽  
Radical Scavenger ◽  
Synthetic Approach ◽  
Metal Free ◽  
System P

The oxidative radical decarboxylation of carboxylic acids with TEMPO as radical scavenger in a biphasic solvent system is reported which is successfully used in a new synthetic approach for the antidepressants indatraline.

Transition metal free, green and facile halogenation of ketene dithioacetals using a KX–oxidant system

2021 ◽  
Author(s):  
Vishakha Rai ◽  
Ganesh Shivayogappa Sorabad ◽  
Mahagundappa Rachappa Maddani
Keyword(s):  
Transition Metal ◽  
Ambient Temperature ◽  
Metal Free ◽  
Ketene Dithioacetals ◽  
System P ◽  
Oxidative Halogenation ◽  
Potassium Halide

A facile oxidative halogenation of α-oxo ketene dithioacetals is achieved by using a potassium halide and an oxidant combination under transition metal free conditions at ambient temperature.

Metal-Free Cascade Methylation/Cyclization of N-Alkyl-N-methacryloylbenzamides with Dicumyl Peroxide

Synlett ◽  
2017 ◽  
Vol 29 (05) ◽  
pp. 617-620 ◽  
Author(s):  
Yan-Ning Niu ◽  
Xiao-Feng Xia ◽  
Yuan Yuan
Keyword(s):  
Free Radical ◽  
Dicumyl Peroxide ◽  
Metal Free ◽  
Wide Range ◽  
Radical Cascade ◽  
Convenient Access

A metal-free radical cascade methylation/cyclization of a wide range of N-alkyl-N-methacryloylbenzamides by using dicumyl peroxide as the methylating reagent provides a convenient access to a series of methylated isoquinoline-1,3-diones in moderate yields.

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