Achieving enhanced solid-state photochromism and mechanochromism by introducing a rigid steric hindrance group

2021 ◽  
Author(s):  
Junzhao He ◽  
Huimin Zhao ◽  
Han Wu ◽  
Yuhui Yang ◽  
Zhaohui Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Steric Hindrance ◽  
Solvent Free ◽  
New Method ◽  
Solvent Free Conditions ◽  
Photochromic Molecules ◽  
Conformational Freedom

For photochromic molecules, effective isomerization usually requires conformational freedom,which is usually unavailable in solvent-free conditions. In this work, we report a new method, which can realize the reversible switching of...

Solid-state Reversible Optical Switch Based on Two Dendritic Molecules with dual sensitivity of mechanochromism and photochromism

2021 ◽  
Author(s):  
Yuhui Yang ◽  
Zhe He ◽  
Junzhao He ◽  
Yuqing Li ◽  
Yilong Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Polymer Matrix ◽  
Optical Switch ◽  
New Method ◽  
Photochromic Molecules ◽  
Conformational Freedom

Efficient isomerization of photochromic molecules requires conformational freedom and is often limited to the solution or polymer matrix. Thus, developing a new method to improve photochromism in the solid state...

Solid-state regioselective nitration of activated hydroxyaromatics and hydroxycoumarins with cerium (IV) ammonium nitrate

2005 ◽  
Vol 2005 (11) ◽  
pp. 733-735 ◽  
Author(s):  
Nemai C. Ganguly ◽  
Sanjoy Dutta ◽  
Mrityunjoy Datta ◽  
Prithwiraj De
Keyword(s):  
Solid State ◽  
Ammonium Nitrate ◽  
High Efficiency ◽  
Solvent Free ◽  
High Melting ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Regioselective Nitration ◽  
Cerium Iv Ammonium Nitrate

Predominant ortho-selective mononitration of low-melting and liquid phenols and hydroxycoumarins in moderate to high yields has been accomplished upon grinding with solid cerium (IV) ammonium nitrate (CAN). Microwave-assisted expeditious CAN-mediated nitration of relatively high melting phenols and hydroxycoumarins with high efficiency and selectively under solvent-free conditions has been also developed to address the problems of sluggishness and low yield for these reluctant substrates.

Highly Chemoselective Solvent-Free Synthesis of 1,3,5-Triaryl-1,5-diketones: Crystallographic Investigation and Intramolecular Weak Bifurcated H Bonds Involving Aliphatic C–H Group

Synlett ◽  
2019 ◽  
Vol 30 (19) ◽  
pp. 2143-2147
Author(s):  
Zhongyou Yin ◽  
Changkun Xiong ◽  
Jianxin Guo ◽  
Xiaoyun Hu ◽  
Zixing Shan ◽  
...  
Keyword(s):  
Solid State ◽  
Decisive Role ◽  
Solvent Free ◽  
Dihedral Angles ◽  
Crystallographic Investigation ◽  
Structural Arrangement ◽  
Bond Lengths ◽  
Solvent Free Conditions ◽  
Solvent Free Synthesis

Several 1,3,5-triaryl-1,5-diketones have been chemoselectively synthesized under solvent-free conditions. It was found that intramolecular weak bifurcated H-bonds interaction of aliphatic C–H group plays a decisive role in the structural arrangement of 3-(2,6-dichlorophenyl)-1,5-diphenylpentane-1,5-dione in a solid state resulting in significant impact on the corresponding bond lengths and dihedral angles.

Efficient synthesis of 2-indolyl-1-nitroalkanes catalyzed by tetramethyl-tetra-3,4-pyridinoporphyrazinato copper(II) methyl sulfate

2012 ◽  
Vol 16 (02) ◽  
pp. 227-234 ◽  
Author(s):  
Elham Safaei ◽  
Sara Sobhani ◽  
Nasrin Razavi
Keyword(s):  
Michael Addition ◽  
Solvent Free ◽  
New Method ◽  
Reusable Catalyst ◽  
Efficient Synthesis ◽  
Methyl Sulfate ◽  
Solvent Free Conditions

A new method for the synthesis of 2-indolyl-1-nitroalkanes from indoles and β-nitrostyrene via Michael addition catalyzed by [ Cu (3,4-tmtppa)] (MeSO4)4 as a reusable catalyst under solvent-free conditions is described. This method has been also successfully applied for Michael addition of 3-methyl-1-phenyl-5-pyrazolone with β-nitrostyrenes.

A new method for the preparation of 1,3,5-triarylbenzenes catalyzed by nanoclinoptilolite/HDTMA

RSC Advances ◽  
2015 ◽  
Vol 5 (15) ◽  
pp. 10869-10877 ◽  
Author(s):  
R. Tayebee ◽  
M. Jarrahi ◽  
B. Maleki ◽  
M. Kargar Razi ◽  
Z. B. Mokhtari ◽  
...  
Keyword(s):  
Efficient Method ◽  
Solvent Free ◽  
New Method ◽  
Reusable Catalyst ◽  
Natural Surface ◽  
Solvent Free Conditions ◽  
Surface Modified

An efficient method for the preparation of 1,3,5-triarylbenzenes. Natural surface-modified NCP as a new and reusable catalyst. Using solvent-free conditions.

scholarly journals Regeneration of Aldehydes from Bisulfite Addition Products in the Solid State using Montmorillonite KSF Clay under Microwave Irradiation

1999 ◽  
Vol 23 (9) ◽  
pp. 560-561
Author(s):  
Alok Kumar Mitra ◽  
Aparna De ◽  
Nilay Karchaudhuri
Keyword(s):  
Solid State ◽  
Microwave Irradiation ◽  
Solvent Free ◽  
Simple Method ◽  
Solvent Free Conditions

Microwave irradiation of bisulfite addition products with montmorillonite KSF clay under solvent-free conditions provides a fast, efficient and simple method for regeneration of aldehydes in excellent yields.

scholarly journals H2SO4-Silica Catalyzed One-Pot and Efficient Synthesis of Dihydropyrimidinones Under Solvent-Free Conditions

2011 ◽  
Vol 8 (s1) ◽  
pp. S462-S466 ◽  
Author(s):  
Seied Ali Pourmousavi ◽  
Maryam Hasani
Keyword(s):  
Condensation Reaction ◽  
Biginelli Reaction ◽  
Reaction Times ◽  
Solvent Free ◽  
New Method ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
One Pot ◽  
Solvent Free Conditions ◽  
High Yields

H2SO4-Silica efficiently catalyzes the three-component condensation reaction of aldehydes, 1,3-dicarbonyl compounds and urea/thiourea under solvent free conditions to afford the corresponding dihydropyrimidinones and thio-derivatives in high yields. Compared to the classical Biginelli reaction conditions, this new method consistently has the advantage of giving good yields and requiring short reaction times.

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