Multicomponent Domino Synthesis of Highly Functionalized Aryl and Heteroaryl Fused Pyrroloquinolinone Ring Systems via Environmentally Benign Solid‐state Melt Reaction

2021 ◽  
Vol 6 (43) ◽  
pp. 12001-12006
Author(s):  
Suresh Mani ◽  
Rajesh Raju ◽  
Raghavacharry Raghunathan ◽  
Natarajan Arumugam ◽  
Abdulrahman I. Almansour ◽  
...  
Keyword(s):  
Solid State ◽  
Environmentally Benign ◽  
Ring Systems

Study on the Graft Copolymerization of AN onto PP by Using Supercritical Carbon Dioxide

2013 ◽  
Vol 815 ◽  
pp. 717-721 ◽  
Author(s):  
Ya Zhen Wang ◽  
Di Ma ◽  
Cheng E Yue ◽  
Wei Nan Jia ◽  
Yong Li
Keyword(s):  
Carbon Dioxide ◽  
Reaction Time ◽  
Solid State ◽  
Supercritical Carbon Dioxide ◽  
Graft Copolymerization ◽  
Environmentally Benign ◽  
Graft Polymer ◽  
Swelling Agent ◽  
Grafting Reaction ◽  
Supercritical Carbon

The research reported in this paper aimed at exploring the advantages of using supercritical carbon dioxide (scCO2) as an environmentally benign solvent and swelling agent for carrying out the grafting process of acrylonitrile (AN) onto polypropylene (PP) in the solid state by using benzoyl peroxide (BPO) as initiator in the reaction. In order to get a well graft ratio, the effects of various factors in this grafting reaction are investigated. Those factors included the reaction time, reaction temperature, monomer and initiator concentrations and the CO2 pressure. IR was used to characterize the constituent of the graft polymer. Then anti-aging of the PP-g-AN was studied by UV-vis. Results showed that the scCO2-assisted solid-state grafting process of AN onto PP did have some scientifically interesting and industrially relevant advantages over the melt process. Compare with virgin PP, the graft polymer have a better performance in anti-aging.

Regeneration of Ketones from Semicarbazones in the Solid State on Wet Silica Supported Sodium Bismuthate under Microwave Irradiation

1999 ◽  
Vol 23 (5) ◽  
pp. 320-321
Author(s):  
Alok Kumar Mitra ◽  
Aparna De ◽  
Nilay Karchaudhuri
Keyword(s):  
Solid State ◽  
Microwave Irradiation ◽  
Solvent Free ◽  
Environmentally Benign ◽  
Simple Method ◽  
Free Condition ◽  
Solvent Free Condition ◽  
Sodium Bismuthate

Microwave irradiation of ketosemicarbazones on wet silica supported sodium bismuthate under environmentally benign solvent-free condition provides a fast, efficient and simple method for regeneration of ketones in good yields.

A/C-Ring Colchicine Analogues: a Comparison of Molecular Conformations of the Minimized and Crystal Structures

1997 ◽  
Vol 50 (2) ◽  
pp. 115
Author(s):  
Kiah H. Ang ◽  
Richard J. Greenwood ◽  
Maureen F. Mackay ◽  
Margaret G. Wong
Keyword(s):  
Solid State ◽  
Molecular Mechanics ◽  
Crystal Structures ◽  
Molecular Orbital ◽  
Low Energy ◽  
Molecular Orbital Calculations ◽  
Tubulin Polymerization ◽  
Ring Systems ◽  
Molecular Conformations ◽  
Low Energy Conformations

Molecular mechanics and molecular orbital calculations have been used to determine the low-energy conformations of six biaryl analogues of colchicine lacking the seven-membered B-ring. A comparison of the conformations resulting from the different minimizations has been made, and these conformations were also compared with those found in the solid state for the respective biaryl analogues and the A/C-ring systems of colchicine and isocolchicine. The barriers to rotation about the A/C-linkage of the analogues were estimated from rotational plots. The MM+ calculations were not satisfactory for estimating the barriers, whilst the MMX, MAXIMIN2 and AM1 values, although agreeing on average only to within 16 kJ mol-1 , exhibited the expected trend in magnitude. This trend, however, did not correlate with the inhibition of tubulin polymerization to microtubules.

A Soft Solution Process to Synthesize Nanocrystalline Barium Zirconate via Reactive Solid State Precursors

2005 ◽  
Vol 23 ◽  
pp. 3-6 ◽  
Author(s):  
Anjali A. Athawale ◽  
Malini Bapat
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Solution Process ◽  
Perovskite Oxide ◽  
Environmentally Benign ◽  
Narrow Particle Size Distribution ◽  
Barium Zirconate ◽  
Metathesis Reaction ◽  
Initial Stage ◽  
Ultrasonic Time

Barium zirconate, a perovskite oxide has been synthesized by a new procedure using solid state metathesis reaction precursors subjected to sonication. We report the lowest temperature of synthesis with particle size ranging from 20 to 30 nm. The initial stage involves formation of composite hydroxide nanoparticles by the solid state reaction of precursor salts with KOH at ambient temperature followed by sonication. BaZrO3 formation as a consequence of ultrasonicator output power variation and ultrasonic time variation has been studied. Results indicate that the process is convenient, low energy, environmentally benign and having narrow particle size distribution of BaZrO3.

Synthesis and Solid-state Structure of 2,2,2ʹ,2ʹ -(Tetrahydroxymethyl)- dibutylether (Di-TMP), an Environmentally Benign Polymer Crosslinker and High-potential Additive for Lubricants

2012 ◽  
Vol 67 (2) ◽  
pp. 181-184
Author(s):  
Guido D. Frey ◽  
Rian D. Dewhurst ◽  
Eberhardt Herdtweck
Keyword(s):  
Crystal Structure ◽  
Mass Spectrometry ◽  
Solid State ◽  
Environmentally Benign ◽  
Monoclinic Space Group ◽  
Spectroscopic Methods ◽  
Two Dimensional ◽  
State Structure ◽  
X Ray ◽  
Trimethylol Propane

The crystal structure of the industrially relevant tetrahydroxy ether 2,2,2ʹ,2ʹ-(tetrahydroxymethyl)-dibutylether (technically known as di(trimethylol)propane, Di-TMP; C12H26O5) was determined from single-crystal X-ray data at 123 K: monoclinic, space group C2/c (no. 15), a = 20.1202(13), b = 5.8169(4), c = 13.0323(8) Å, β = 114.296(3)°, V = 1390.17(16) Å3 and Z = 4. The adjacent molecules assemble into a two-dimensional framework in the solid state, linked by two intermolecular O-H...O hydrogen bonds. The compound is characterized via spectroscopic methods and mass spectrometry.

1993 ALCAN Award Lecture Chemical binding within and between inorganic rings; the design and synthesis of molecular conductors

1993 ◽  
Vol 71 (11) ◽  
pp. 1775-1784 ◽  
Author(s):  
Richard T. Oakley
Keyword(s):  
Solid State ◽  
New Materials ◽  
Molecular Conductors ◽  
Chemical Binding ◽  
Ring Systems ◽  
Design And Synthesis ◽  
Periodic Groups ◽  
Inorganic Rings ◽  
High Electronegativity

For a given number of skeletal atoms, the π-electron count of an unsaturated heterocycle can be modified by the incorporation of heteroatoms from different periodic groups. Sulfur and nitrogen are particularly effective in this regard, as their high electronegativity can stabilize electron-rich π-systems. A variety of aromatic, anti-aromatic, and radical systems can be prepared from admixtures of these elements. While the properties of these ring systems are interesting in their own right, the compounds are not without relevance in the design of new materials. The strong interannular interactions that are developed between these rings in the solid state makes them ideal candidates for the fabrication of molecular conductors. The origins and development of this area of research are the subjects of this presentation.

Comments on collision mechanics in ring systems

1984 ◽  
Vol 75 ◽  
pp. 407-422
Author(s):  
William K. Hartmann
Keyword(s):  
Asteroid Belt ◽  
Surface Erosion ◽  
Surface Layers ◽  
Ring Systems ◽  
Eclipse Observations ◽  
Saturn’S Rings ◽  
Saturn's Rings

ABSTRACTThe nature of collisions within ring systems is reviewed with emphasis on Saturn's rings. The particles may have coherent icy cores and less coherent granular or frosty surface layers, consistent with thermal eclipse observations. Present-day collisions of such ring particles do not cause catastrophic fragmentation of the particles, although some minor surface erosion and reaccretion is possible. Evolution by collisional fragmentation is thus not as important as in the asteroid belt.

Sign in / Sign up

Export Citation Format

Share Document