Dealuminated BEA zeolite for selective synthesis of five-membered cyclic acetal from glycerol under ambient conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (23) ◽  
pp. 18824-18833 ◽  
Author(s):  
N. J. Venkatesha ◽  
Y. S. Bhat ◽  
B. S. Jai Prakash
Keyword(s):  
Selective Synthesis ◽  
Cyclic Acetal ◽  
Ambient Conditions ◽  
Bea Zeolite ◽  
Cyclic Product

BEA zeolite is modified using phenoldisulfonic acid to change catalyst characteristics, which helps to form a single cyclic product. A new term called volume space acidity (VSA) provides volume space available for dioxane to dioxalane rearrangement.

Solvent-controlled selective synthesis of biphenols and quinones via oxidative coupling of phenols

2017 ◽  
Vol 53 (69) ◽  
pp. 9616-9619 ◽  
Author(s):  
Nagnath Yadav More ◽  
Masilamani Jeganmohan
Keyword(s):  
Oxidative Coupling ◽  
Regioselective Synthesis ◽  
Selective Synthesis ◽  
Ambient Conditions

A regioselective synthesis of unsymmetrical and symmetrical biphenols and binaphtholsviaoxidative coupling of phenols or naphthols in the presence of K2S2O8in CF3COOH under ambient conditions is described.

Microplasma-enabled nanocarbon assembly for the diameter-selective synthesis of colloidal graphene quantum dots

2020 ◽  
Vol 56 (71) ◽  
pp. 10365-10368
Author(s):  
Jhih-Siang Yang ◽  
Yi-Chen Chang ◽  
Quan-Hou Huang ◽  
Yu-Ying Lai ◽  
Wei-Hung Chiang
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Selective Synthesis ◽  
Ambient Conditions

A microplasma synthesis of diameter-controlled colloidal graphene quantum dots under ambient conditions is demonstrated.

Layer-Selective Synthesis of MoS2 and WS2 Structures under Ambient Conditions for Customized Electronics

ACS Nano ◽  
2020 ◽  
Vol 14 (7) ◽  
pp. 8485-8494 ◽  
Author(s):  
Seoungwoong Park ◽  
Aram Lee ◽  
Kwang-Hun Choi ◽  
Seok-Ki Hyeong ◽  
Sukang Bae ◽  
...  
Keyword(s):  
Selective Synthesis ◽  
Ambient Conditions

Sulfolane Mediated Highly Selective Synthesis of Mono and Bis-aryl-2-Methyl-6- Fluoro-Indoles and Their Halogenated Synthons

2020 ◽  
Vol 24 (19) ◽  
pp. 2283-2291
Author(s):  
Koppada Masthan Raju ◽  
Ravi Kumar Cheedarala ◽  
Arumugam Pandurangan
Keyword(s):  
Nucleophilic Substitution ◽  
Elevated Temperatures ◽  
Reaction Medium ◽  
Selective Synthesis ◽  
Chemical Transformations ◽  
Ambient Conditions ◽  
Analytical Tools

A simple, efficient, and cheap strategy has been developed for N-arylation of indoles with hexafloro benzene (1) via incorporating sulfolane as an eco-friendly solvent. NMonopentafluoroarylindole (3) at ambient conditions and N, N-bistetrafluoroaryl indole (4) at elevated temperatures were conveniently obtained by simple nucleophilic substitution using NaOH as the base and sulfolane as a reaction medium to obtain in moderately good yields, respectively. Subsequently, 3-chloro, 3-bromo, and 3-iodomono-pentafluoroarylindoles and 3, 3’-dichloro, 3, 3’-dibromo and 3, 3’-diIodobistetrafluoroaryl indoles were prepared in good yields by using respective halogenating reagents and solvents. All the chemical transformations were confirmed by analytical tools such as 1HNMR, FR-IR and HRMS analysis.

Surfactant Selective Synthesis of Gold Nanowires by Using a DPPC−Surfactant Mixture as a Capping Agent at Ambient Conditions

2007 ◽  
Vol 111 (16) ◽  
pp. 5932-5940 ◽  
Author(s):  
Mandeep Singh Bakshi ◽  
Gurpreet Kaur ◽  
Pankaj Thakur ◽  
Tarlok Singh Banipal ◽  
Fred Possmayer ◽  
...  
Keyword(s):  
Gold Nanowires ◽  
Selective Synthesis ◽  
Capping Agent ◽  
Surfactant Mixture ◽  
Ambient Conditions

Hydrogen bonding in liquid methanol at ambient conditions and at high pressure

2000 ◽  
Vol 98 (3) ◽  
pp. 125-134 ◽  
Author(s):  
T. Weitkamp, J. Neuefeind, H. E. Fisch
Keyword(s):  
High Pressure ◽  
Hydrogen Bonding ◽  
Ambient Conditions

Hybrid Micro-Optical Sensors via Sol-Gel Soft Lithography

2000 ◽  
Vol 628 ◽  
Author(s):  
Mark A. Clarner ◽  
Michael J. Lochhead
Keyword(s):  
Optical Sensors ◽  
Soft Lithography ◽  
Sol Gel ◽  
Silica Gels ◽  
Ph Sensing ◽  
Ambient Conditions ◽  
Sensor Applications ◽  
Patterned Structures ◽  
Biological Functionality ◽  
Indicator Dyes

ABSTRACTOrganically modified silica gels and dye-doped silica gels have been patterned into micrometer-scale structures on a substrate using micro molding in capillaries (MIMIC). This approach is from a class of elastomeric stamping and molding techniques collectively known as soft lithography. Soft lithography and sol-gel processing share attractive features in that they are relatively benign processes performed at ambient conditions, which makes both techniques compatible with a wide variety of organic molecules, molecular assemblies, and biomolecules. The combination of sol-gel and soft lithography, therefore, holds enormous promise as a tool for microfabrication of materials with optical, chemical, or biological functionality that are not readily patterned with conventional methods. This paper describes our investigation of micro-patterned organic-inorganic hybrid materials containing indicator dyes for microfluidic sensor applications. Reversible colorimetric pH sensing via entrapped reagents is demonstrated in a prototype microfluidic sensor element. Patterned structures range from one to tens of micrometers in cross-section and are up to centimeters in length. Fundamental chemical processing issues associated with mold filling, cracking and sensor stability are discussed.

Fluorescence of BODIPY Dyes in Gas Phase at near Ambient Conditions

2020 ◽  
Author(s):  
Kseniya A. Mariewskaya ◽  
Denis Larkin ◽  
Yuri Samoilichenko ◽  
Vladimir Korshun ◽  
Alex Ustinov
Keyword(s):  
Gas Phase ◽  
Molecular Interactions ◽  
Atmospheric Pressure ◽  
Fluorescence Spectra ◽  
Visible Range ◽  
Intrinsic Properties ◽  
Ambient Conditions ◽  
Ideal Model ◽  
Molecular Fluorescence ◽  
Tesla Coil

Molecular fluorescence is a phenomenon that is usually observed in condensed phase. It is strongly affected by molecular interactions. The study of fluorescence spectra in the gas phase can provide a nearly-ideal model for the evaluation of intrinsic properties of the fluorophores. Unfortunately, most conventional fluorophores are not volatile enough to allow study of their fluorescence in the gas phase. Here we report very bright gas phase fluorescence of simple BODIPY dyes that can be readily observed at atmospheric pressure using conventional fluorescence instrumentation. To our knowledge, this is the first example of visible range gas phase fluorescence at near ambient conditions. Evaporation of the dye in vacuum allowed us to demonstrate organic molecular electroluminescence in gas discharge excited by electric field produced by a Tesla coil.

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