Glucose Catalysed and Ultrasound Assisted Synthesis of Pharmaceutically Potent Azomethine Analogues in Water Medium: A Complete Green Approach

2019 ◽  
Vol 11 (02) ◽  
Keyword(s):  
Water Medium ◽  
Green Approach ◽  
Ultrasound Assisted

Green Approach for the Synthesis of Quinoxaline Derivatives in Water Medium Using Reusable Polyaniline-sulfate Salt Catalyst and Sodium Laurylsulfate

2007 ◽  
Vol 121 (3-4) ◽  
pp. 291-296 ◽  
Author(s):  
Ch. Srinivas ◽  
Ch. N. S. Sai Pavan Kumar ◽  
V. Jayathirtha Rao ◽  
S. Palaniappan
Keyword(s):  
Water Medium ◽  
Sulfate Salt ◽  
Green Approach ◽  
Quinoxaline Derivatives

scholarly journals Microwave assisted green synthesis of pharmaceutically potent benzoxanthone analogues employing biodegradable oxalic acid as ecofriendly catalyst

2019 ◽  
Vol 9 (5) ◽  
pp. 4311-4316
Keyword(s):  
Oxalic Acid ◽  
Research Work ◽  
Aromatic Aldehydes ◽  
Water Medium ◽  
Spectroscopic Techniques ◽  
Green Catalyst ◽  
Green Approach ◽  
Microwave Irradiations ◽  
Ft Ir ◽  
Good Percentage

The aim of the present research work is to develop an efficient and ecofriendly methodology to synthesize benzoxanthones analogs by employing oxalic acid as nontoxic, biodegradable catalyst in water medium. The reactions were carried out under microwave irradiations. Thus hereby a series of benzoxanthones were synthesized from various aromatic aldehydes of varying electronic natures via a complete green approach where microwave irradiation was used as an efficient green source of energy, oxalic acid was employed as green catalyst and water were used as green solvent in all the reactions. The synthesized compounds have given a good percentage of yield of all the products and they were characterized by melting point, FT-IR, H1-NMR C13-NMR and mass spectroscopic techniques.

scholarly journals Sonochemistry: Non-Classical Way of Synthesis

2019 ◽  
Vol 9 (6-s) ◽  
pp. 229-232
Author(s):  
Pintu Prajapati ◽  
Avani Sheth ◽  
Dhaval M Patel ◽  
Advaita Patel ◽  
Priti Mehta
Keyword(s):  
Chemical Synthesis ◽  
Chemical Reactions ◽  
Chemical Reaction ◽  
Driving Force ◽  
Current Knowledge ◽  
Theoretical Background ◽  
Green Approach ◽  
Ultrasound Assisted ◽  
Viable Approach ◽  
Detailed Picture

This review presents the detailed picture of current knowledge on ultrasound assisted chemical reactions and its green approach in chemical synthesis. This article illustrates the theoretical background and details about ultrasound, its mechanism (cavitation, the driving force) in chemical synthesis, types of reactions with different systems and its utility. All the reported applications have shown that Sonochemistry, ultrasound assisted chemical reaction is a green and economical viable approach for drug, impurity or chemical intermediate synthesis. Keywords: Cavitation, Sonocatalysis, Sonochemistry Ultrasound

scholarly journals Accelerated Solvent Extraction as a Green Tool for the Recovery of Polyphenols and Pigments from Wild Nettle Leaves

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 803
Author(s):  
Maja Repajić ◽  
Ena Cegledi ◽  
Valentina Kruk ◽  
Sandra Pedisić ◽  
Fırat Çınar ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Antioxidant Capacity ◽  
Accelerated Solvent Extraction ◽  
Ultrasound Assisted Extraction ◽  
Extraction Solvent ◽  
Green Approach ◽  
Assisted Extraction ◽  
Chlorophylls A And B ◽  
Different Temperatures ◽  
Ultrasound Assisted

This study aimed to investigate the performance of accelerated solvent extraction (ASE) as a green approach for the recovery of polyphenols and pigments from wild nettle leaves (NL). ASE was operated at different temperatures (20, 50, 80 and 110 °C), static times (5 and 10 min) and cycle numbers (1–4) using ethanol (96%) as an extraction solvent. In order to compare the efficiency of ASE, ultrasound assisted extraction (UAE) at 80 °C for 30 min was performed as a referent. Polyphenol and pigment analyses were carried out by HPLC and antioxidant capacity was assessed by ORAC. Seven polyphenols from subclasses of hydroxycinnamic acids and flavonoids, along with chlorophylls a and b and their derivatives and six carotenoids and their derivatives were identified and quantified. Chlorogenic acid was the most abundant polyphenol and chlorophyll a represented the dominant pigment. ASE conditions at 110 °C/10 min/3 or 4 cycles proved to be the optimal for achieving the highest yields of analyzed compounds. In comparison with UAE, ASE showed better performance in terms of yields and antioxidants recovery, hence delivering extract with 60% higher antioxidant capacity. Finally, the potential of NL as a functional ingredient from natural sources can be successfully accessed by ASE.

scholarly journals Green approach using water mediated Diels-Alder reaction for the synthesis of some 2-(4-bromo-1-naphthyl)-3-(aryl) bicyclo[2.2.1]hept-5-ene methanones and evaluation of their antimicrobial and antioxidant activities

2017 ◽  
Vol 36 (1) ◽  
Author(s):  
Ganesamoorthy Thirunarayanan
Keyword(s):  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Cycloaddition Reaction ◽  
Alder Reaction ◽  
Diels Alder ◽  
Water Medium ◽  
Antibacterial And Antifungal Activities ◽  
Green Approach ◽  
Antibacterial And Antifungal

Some (4-bromo-1-naphthyl)-(3-(substituted phenyl) bicyclo[2.2.1]hept-5-en-2-yl) methyl ketones were synthesized by fly-ash catalyzed environmentally benign Diels-Alder [4+2] cycloaddition reaction of 4-bromo-1-naphthyl chalcones and cyclopentadiene in water medium.  In this reaction, the obtained yield was more than 60%.  The synthesized methanones were characterized by their physical constants, microanalysis, infrared, nuclear magnetic resonance and mass spectroscopic data.  The antibacterial and antifungal activities of these ketones were evaluated by the disc diffusion-zone of inhibition and two-fold serial-dilution-minimum inhibitory concentration of their corresponding bacterial and fungal strains using the Bauer-Kirby method.  The antioxidant activities of these methanones were measured using the diphenyl picryl hydrazyl (DPPH) radical scavenging activity method. 

A Green Approach to the Synthesis of α-Amino Phosphonate in Water Medium: Carbene Insertion into the N–H Bond by Cu(I) Catalyst

2016 ◽  
Vol 81 (20) ◽  
pp. 9826-9835 ◽  
Author(s):  
Kankanala Ramakrishna ◽  
Jisha Mary Thomas ◽  
Chinnappan Sivasankar
Keyword(s):  
Water Medium ◽  
Green Approach ◽  
Carbene Insertion ◽  
Amino Phosphonate
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