scholarly journals A Cost-Efficient Method for Unsymmetrical Meso-Aryl Porphyrin Synthesis Using NaY Zeolite as an Inorganic Acid Catalyst

Molecules ◽  
2017 ◽  
Vol 22 (5) ◽  
pp. 741 ◽  
Author(s):  
◽  
◽  
◽  
◽  
◽  
...  
Keyword(s):  
Efficient Method ◽  
Acid Catalyst ◽  
Inorganic Acid ◽  
Nay Zeolite ◽  
Cost Efficient ◽  
Porphyrin Synthesis

Automatic Beach & Garden Umbrella with Rain Sensor

2021 ◽  
Vol 9 (VI) ◽  
pp. 1714-1722
Author(s):  
Md Subhan Alam
Keyword(s):  
Efficient Method ◽  
High Intensity ◽  
Power Transmission ◽  
Temperature Sensors ◽  
Summer Season ◽  
Project Report ◽  
Is Management ◽  
Human Effort ◽  
Cost Efficient

The aim of this project report is to form a sensible umbrella which may cut back human effort to its practicality and may target the market to its distinctive style, is basically vital in trendy society in danger of rain and wind while not coverage the aim of this project is to form such associate umbrella that's extremely sensitive within the incidences of rain and daylight at domestic and market level. Specifically, in summer season the ground of open areas gets thus heat to sun lightweight that produces problem for operating. This umbrella covers the whole hall throughout the rain and daylight. This umbrella operates with the assistance of various sensors like temperature sensors, water sensors and wind sensors. The gap and shutting of umbrella is being controlled through a motor. Motor will provides a fast and instant response to the shaft so shaft will play a significant role of power transmission for gap and shutting of umbrella. Motor provides needed rate to the shaft. Whenever temperature of the atmosphere goes on top of 28°, temperature device sends signal to Arduino that is management unit box. Then Arduino sends signal more to the motor so motor might activate and deliver needed rate to the coupling shaft. This project could be a cost-efficient method of providing machine-controlled controlled shade from high intensity daylight and rain. So, the issues of open and large areas is solved by mistreatment such kinds of machine-controlled umbrellas.

Synthesis of endo-fused 5-unsubstituted hexahydro-2H-pyrano[3,2- c]quinolines via sequential Sc(OTf)3-catalyzed cationic imino-Diels-Alder Reaction/N-debenzylation using N-benzylanilines, 3,4-dihydro-2H-pyran and paraformaldehyde under MW irradiation

2021 ◽  
Vol 18 ◽  
Author(s):  
Arturo René Mendoza Salgado ◽  
Carlos Eduardo Puerto Galvis ◽  
Vladimir V. Kouznetsov ◽  
Carlos Mario Meléndez
Keyword(s):  
Efficient Method ◽  
Cycloaddition Reaction ◽  
Acid Catalyst ◽  
Alder Reaction ◽  
Diels Alder ◽  
Synthetic Methods ◽  
Diels Alder Reaction ◽  
Catalytic Transfer ◽  
Lewis Acid Catalyst ◽  
Mw Irradiation

Background: Hexahydro-2H-pyrano[3,2-c]quinolines are known to have antibacterial, antifungal, and antitumor properties. Great efforts have been made to develop new synthetic methods that lead to the synthesis of valuable libraries. Extensive methodologies, low yields, excessive amounts of catalyst and expensive reactants are some of the limitations of current methodologies. Aim and Objective: Developing a useful and efficient method to construct diversely substituted hexahydro-2H-pyrano[3,2- c]quinolines into good to excellent yields through a cationic imino-Diels-Alder/N-debenzylation methodology. Method: The cationic imino-Diels-Alder/N-debenzylation methodology was used for the preparation of substituted hexahydro-2H-pyrano[3,2-c]quinolines. It involves the use of Sc(OTf)3 for activation of cationic imino-Diels-Alder cycloaddition reaction of N-benzylanilines, 3,4-dihydro-2H-pyran and paraformaldehyde in MeCN; and microwave irradiation to shorten reaction time to afford new 6-benzyl-hexahydro-2H-pyrano[3,2-c]quinolines whose catalytic transfer debenzylation reactions with HCO2NH4 in the presence of Pd/C (10%) and methanol give the new 5-unsubstituted pyrano[3,2- c]quinolines in excellent yields. Results: We found that optimal conditions for the preparation of hexahydro-2H-pyrano[3,2-c]quinolines were Sc(OTf)3 0,5 % and acetonitrile at 160 ° C for 15 min; and using paraformaldehyde obtained the 6-benzyl-hexahydro-2H-pyrano [3,2- c]quinolines with excellent yields, while the N-debenzylation process using ammonium formate in the presence of Pd/C and methanol resulted in the synthesis of hexahydro-2H-pyrano [3,2-c] quinolines with quantitative yields (95-98%). Conclusion: We describe an efficient method to synthesize hexahydro-2H-pyrano[3,2-c]quinolines via the cationic iminoDiels-Alder/N-debenzylation methodology using Sc(OTf)3 0,5 % as Lewis Acid catalyst. Excellent yields of the products, using of MW irradiation, short times of reactions and an efficient and highly diversified method are some of the main advantages of this new protocol.

Efficient method for ring opening of epoxides with amines by NaY zeolite under solvent-free conditions

2007 ◽  
Vol 264 (1-2) ◽  
pp. 162-169 ◽  
Author(s):  
Rukhsana Ilyas Kureshy ◽  
Surendra Singh ◽  
Noor-ul Hasan Khan ◽  
Sayed Hasan Razi Abdi ◽  
Eringathodi Suresh ◽  
...  
Keyword(s):  
Efficient Method ◽  
Ring Opening ◽  
Solvent Free ◽  
Nay Zeolite ◽  
Solvent Free Conditions ◽  
Ring Opening Of Epoxides

Toward a Cost-Efficient Method for Monitoring of Traffic-Derived Pollutants with Quartz Sand Boxes

2016 ◽  
Vol 227 (6) ◽  
Author(s):  
Gobinda Ojha ◽  
Erwin Appel ◽  
Małgorzata Wawer ◽  
Tadeusz Magiera ◽  
Shouyun Hu
Keyword(s):  
Efficient Method ◽  
Quartz Sand ◽  
Cost Efficient

scholarly journals Novel catalytic synthesis of 6,7-dimethoxyisatin with the use of heteropolyacids (HPAs) as acid solid catalyst

2009 ◽  
Vol 11 (3) ◽  
pp. 5-7 ◽  
Author(s):  
Ali Gharib ◽  
Mohsen Daneshtalab ◽  
J. Scheeren ◽  
Fatemeh Bamoharram ◽  
Mina Roshani ◽  
...  
Keyword(s):  
Efficient Method ◽  
Good Yield ◽  
Acid Catalyst ◽  
Catalytic Synthesis ◽  
The Other ◽  
Solid Catalyst ◽  
Keggin Type ◽  
Mineral Acids ◽  
Green Conditions

Novel catalytic synthesis of 6,7-dimethoxyisatin with the use of heteropolyacids (HPAs) as acid solid catalyst An efficient method for the preparation of 6,7-dimethoxyisatin and its derivatives was developed with good yield by using Preyssler-type heteropolyacid (HPA) as acid catalyst under green conditions. The comparison between Keggin type heteropolyacids, H3[PW12O40], H4[SiW12O40] and H4[SiMo12O40], H3[PMo12O40] and mineral acids with Preyssler's anion shows that the latter possess better catalytical activity than the other heteropolyacids and no degradation of the structure was observed.

A SAFE AND COST-EFFICIENT METHOD FOR SEDATION AND ANXIOLYSIS IN CRITICALLY ILL PATIENTS

1995 ◽  
Vol 23 (Supplement) ◽  
pp. A65
Author(s):  
Aurel C. Cernaianu ◽  
Anthony J. DelRossi ◽  
Jonathan H. Cilley ◽  
Michael A. Grosso ◽  
Teimouraz Vassilidze ◽  
...  
Keyword(s):  
Critically Ill ◽  
Efficient Method ◽  
Critically Ill Patients ◽  
Cost Efficient

Efficient Synthesis of 2,3-Dihydro-1H-Perimidine Derivatives Using HBOB as a Novel Solid Acid Catalyst

2012 ◽  
Vol 65 (1) ◽  
pp. 86 ◽  
Author(s):  
Sunanda B. Phadtare ◽  
R. Vijayraghavan ◽  
Ganapati S. Shankarling ◽  
Douglas R. MacFarlane
Keyword(s):  
Boric Acid ◽  
Efficient Method ◽  
Solid Acid ◽  
Simple Procedure ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Thermal Processes ◽  
Efficient Synthesis ◽  
Acid Catalyzed ◽  
Time Required

An efficient method for the synthesis of substituted 2,3-dihydro-1H-perimidine derivatives is described using bis(oxalato)boric acid (HBOB) as catalyst. The methodology provides an easily handled and recyclable catalyst for this type of reaction as an alternative platform to the conventional acid-catalyzed thermal processes. The time required to complete the reaction using HBOB was found to be shorter than conventional methods. Recycling of the catalyst has been efficiently achieved using a simple procedure.

Sign in / Sign up

Export Citation Format

Share Document