Native lipase dissolved in hydrophilic green solvents: A versatile 2-phase reaction system for high yield ester synthesis

2015 ◽  
Vol 117 (2) ◽  
pp. 167-177 ◽  
Author(s):  
Beatrice Kleiner ◽  
Ulrich Schörken
Keyword(s):  
Reaction System ◽  
High Yield ◽  
Phase Reaction ◽  
Green Solvents ◽  
Ester Synthesis ◽  
Native Lipase

A two-phase system for the clean and high yield synthesis of furylmethane derivatives over –SO3H functionalized ionic liquids

2017 ◽  
Vol 19 (20) ◽  
pp. 4804-4810 ◽  
Author(s):  
S. H. Shinde ◽  
C. V. Rode
Keyword(s):  
Ionic Liquids ◽  
Reaction System ◽  
High Yield ◽  
Phase System ◽  
Phase Reaction ◽  
Two Phase ◽  
Yield Production ◽  
High Yield Production

A new and effective unique two-phase reaction system for the high yield production of tri(furyl)methane from furfural and furan.

scholarly journals Understanding the aqueous phase ozonolysis of isoprene: distinct product distribution and mechanism from the gas phase reaction

2012 ◽  
Vol 12 (15) ◽  
pp. 7187-7198 ◽  
Author(s):  
H. L. Wang ◽  
D. Huang ◽  
X. Zhang ◽  
Y. Zhao ◽  
Z. M. Chen
Keyword(s):  
Organic Acids ◽  
Gas Phase ◽  
Aqueous Phase ◽  
Reaction System ◽  
Chemical Processes ◽  
Total Carbon ◽  
High Yield ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Wet Particles

Abstract. The aqueous phase reaction of volatile organic compounds (VOCs) has not been considered in most analyses of atmospheric chemical processes. However, some experimental evidence has shown that, compared to the corresponding gas phase reaction, the aqueous chemical processes of VOCs in the bulk solutions and surfaces of ambient wet particles (cloud, fog, and wet aerosols) may potentially contribute to the products and formation of secondary organic aerosol (SOA). In the present study, we performed a laboratory experiment of the aqueous ozonolysis of isoprene at different pHs (3–7) and temperatures (4–25 °C). We detected three important kinds of products, including carbonyl compounds, peroxide compounds, and organic acids. Our results showed that the molar yields of these products were nearly independent of the investigated pHs and temperatures, those were (1) carbonyls: 56.7 ± 3.7 % formaldehyde, 42.8 ± 2.5 % methacrolein (MAC), and 57.7 ± 3.4 % methyl vinyl ketone (MVK); (2) peroxides: 53.4 ± 4.1 % hydrogen peroxide (H2O2) and 15.1 ± 3.1 % hydroxylmethyl hydroperoxide (HMHP); and (3) organic acids: undetectable (<1 % estimated by the detection limit). Based on the amounts of products formed and the isoprene consumed, the total carbon yield was estimated to be 94.8 ± 4.1 %. This implied that most of the products in the reaction system were detected. The combined yields of both MAC + MVK and H2O2 + HMHP in the aqueous isoprene ozonolysis were much higher than those observed in the corresponding gas phase reaction. We suggest that these unexpected high yields of carbonyls and peroxides are related to the greater capability of condensed water, compared to water vapor, to stabilize energy-rich Criegee radicals. This aqueous ozonolysis of isoprene (and possibly other biogenic VOCs) could potentially occur on the surfaces of ambient wet particles and plants. Moreover, the high-yield carbonyl and peroxide products might provide a considerable source of aqueous phase oxidants and SOA precursors.

Polymer-Bound Triphenylphosphine and 4,4′-Dinitroazobenzene as a Coupling Reagents for Chromatography-Free Esterification Reaction

2019 ◽  
Vol 16 (7) ◽  
pp. 1024-1031
Author(s):  
Diparjun Das ◽  
Kalyani Rajkumari ◽  
Lalthazuala Rokhum
Keyword(s):  
Microwave Irradiation ◽  
Solid Phase ◽  
Reaction System ◽  
Triphenylphosphine Oxide ◽  
High Yield ◽  
Sustainable Chemistry ◽  
Esterification Reaction ◽  
Coupling Reagent ◽  
Simple Filtration ◽  
Esterification Reactions

Aim and Objective: Sustainable production of fine chemicals both in industries and pharmaceuticals heavily depends on the application of solid-phase synthesis route coupled with microwave technologies due to their environmentally benign nature. In this report, a microwave-assisted esterification reaction using polymer-bound triphenylphosphine and 4,4′-dinitroazobenzene reagent system was investigated. Materials and Methods: The solvents were obtained from Merck India. Polymer-bound triphenylphosphine (~3 mmol triphenylphosphine moiety/g) was acquired from Sigma-Aldrich. The progress of the reaction was observed by thin-layer chromatography. All the reactions were performed in Milestones StartSYNTH microwave. The NMR spectra were recorded on Bruker Avance III 300, 400, and 500 MHz FT NMR Spectrometers. Using azo compound and polymer-bound triphenyl phosphine as a coupling reagent, esterification of different carboxylic acids with alcohols was performed under microwave irradiation. Results: Esterification of benzoic acid with 1-propanol under microwave irradiation gave a high yield of 92% propyl benzoate in 60 minutes only. Isolation of the ester products was relatively simple as both the byproducts polymer-bound triphenylphosphine oxide and hydrazine could be removed by simple filtration. The rates of reactions were found to be directly proportional to the pKa of the benzoic acids. Conclusion: 4,4′-Dinitroazobenzene was introduced as a novel coupling reagent, in conjugation with polymer-bound triphenylphosphine, for esterification reactions under microwave irradiation. The low moisture sensitivity of the reaction system, easy separation of the byproducts, and column chromatographyfree isolation of esters help our methods with application significance, particularly from the ‘Sustainable Chemistry’ perspective.

Facile Synthesis of Tribenzosilepins from Terphenyls and Dihydrosilanes by Electrophilic Double Silylation

2021 ◽  
Author(s):  
Yafang Dong ◽  
Kohei Sekine ◽  
Yoichiro Kuninobu
Keyword(s):  
Reaction System ◽  
High Yield ◽  
Facile Synthesis

Tribenzosilepins were synthesized from terphenyls and dihydrosilanes using a facile approach using a double sila-Friedel–Crafts reaction. Several silepin derivatives were obtained in moderate to high yield. The reaction system was...

Catalytic conversion of biomass derivatives to lactic acid with increased selectivity in an aqueous tin(ii) chloride/choline chloride system

2018 ◽  
Vol 20 (17) ◽  
pp. 4112-4119 ◽  
Author(s):  
Asep Bayu ◽  
Akihiro Yoshida ◽  
Surachai Karnjanakom ◽  
Katsuki Kusakabe ◽  
Xiaogang Hao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lactic Acid ◽  
Aqueous Phase ◽  
Choline Chloride ◽  
Reaction System ◽  
Catalytic Conversion ◽  
Phase Reaction ◽  
Chloride System ◽  
System P

The catalytic activity and selectivity of SnCl2 for the conversion of biomass derivatives into LacA in the aqueous phase reaction system was found to be increased by the addition of choline chloride.

Estimation of Overall Transesterification Rate of Palm Oil in Oil- Methanol Two-Phase Reaction System - Does The Mass Transfer Matter? -

2018 ◽  
Vol 5 (10) ◽  
pp. 22123-22127 ◽  
Author(s):  
Yoshimitsu Uemura ◽  
Fon Yee Han ◽  
Thanh Tien Nguyen ◽  
Thanh Hoai Trinh ◽  
Katsuki Kusakabe
Keyword(s):  
Mass Transfer ◽  
Palm Oil ◽  
Reaction System ◽  
Phase Reaction ◽  
Two Phase

Conversion of carbohydrates into 5-hydroxymethylfurfural in an advanced single-phase reaction system consisting of water and 1,2-dimethoxyethane

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 84014-84021 ◽  
Author(s):  
Shurong Wang ◽  
Haizhou Lin ◽  
Jingping Chen ◽  
Yuan Zhao ◽  
Bin Ru ◽  
...  
Keyword(s):  
Single Phase ◽  
Reaction System ◽  
Phase Reaction

An advanced single-phase reaction system consisting of water–DMOE solvent and AlCl3 could be used efficiently and economically in HMF production.

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