scholarly journals Functional Poly(dihalopentadiene)s: Stereoselective Synthesis, Aggregation-Enhanced Emission and Sensitive Detection of Explosives

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 821 ◽  
Author(s):  
Ting Han ◽  
Yun Zhang ◽  
Benzhao He ◽  
Jacky Lam ◽  
Ben Tang
Keyword(s):  
Stereoselective Synthesis ◽  
Aqueous Media ◽  
Wavelength Region ◽  
Polymeric Materials ◽  
High Refractive Index ◽  
Fluorescent Chemosensors ◽  
Reaction Conditions ◽  
Film Forming ◽  
Detection Of Explosives ◽  
Novel Structures

The development of polymeric materials with novel structures and unique properties and functionalities is of both academic and industrial significance. In this work, functional poly(dihalopentadiene)s were synthesized by boron trihalide-mediated multicomponent polymerization routes in a stereoselective manner. The polymerizations of tetraphenylethylene-containing diyne, BX3 (X = Cl, Br) and p-tolualdehyde proceed smoothly in dichloromethane under mild conditions to afford high molecular weight poly(dihalopentadiene)s with a predominant (Z,Z)-configuration in moderate to good yields. The reaction conditions and the boron trihalide used were found to have great effects on the stereochemistry of the resulting polymer structures. The obtained poly(1,5-dihalo-(Z,Z)-1,4-pentadiene)s possess high thermal stability and good film-forming ability. Their thin films show high refractive index of 1.9007–1.6462 in a wide wavelength region of 380–890 nm with low optical dispersion. The polymers are weakly emissive in dilute solutions but become highly emissive upon aggregated, demonstrating a unique phenomenon of aggregation-enhanced emission. Their nanoaggregates in aqueous media can serve as sensitive fluorescent chemosensors for the detection of explosives with a superamplification effect and a low detection limit.

Hybrid nanoparticle based fluorescence switch for recognition of ketoprofen in aqueous media

2020 ◽  
Vol 5 (8) ◽  
pp. 1428-1436
Author(s):  
Anu Saini ◽  
Manpreet Kaur ◽  
Mayank ◽  
Anil Kuwar ◽  
Navneet Kaur ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Fluorescent Chemosensors ◽  
Fluorescence Switch ◽  
Nanomolar Detection ◽  
Hybrid Nanoparticle

Hybrid nanoassembly, fluorescent chemosensors, selective response to ketoprofen, and nanomolar detection.

Efficient synthesis of pyrido[2,3-d]pyrimidine-7-carboxylic acids catalyzed by a TiO2/SiO2 nanocomposite in aqueous media at room temperature

2018 ◽  
Vol 73 (9) ◽  
pp. 641-645 ◽  
Author(s):  
Sepehr Sadegh-Samiei ◽  
Shahrzad Abdolmohammadi
Keyword(s):  
Heterogeneous Catalyst ◽  
Carboxylic Acids ◽  
Room Temperature ◽  
Aqueous Media ◽  
Reaction Times ◽  
Molar Ratio ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Recyclable Heterogeneous Catalyst

AbstractA novel and efficient synthesis of eight 5-aryl-1,3-dimethyl-2,4-dioxo-1,2,3,4,5,8-hexahydropyrido[2,3-d]pyrimidine-7-carboxylic acids using a TiO2/SiO2 nanocomposite with a molar ratio of 1:1 as a recyclable heterogeneous catalyst is described. The desired products, five of which are new, are formed in short reaction times (2–3 h) with high to excellent yields (94%–98%) under very moderate reaction conditions (room temperature, aqueous media).

Self-Assembled Porous Nanoparticles Based on Silicone Polymer with Aggregation-induced Emission for Highly Sensitive Detection of Nitroaromatics

2021 ◽  
Author(s):  
Xiangzhong Zhao ◽  
Yan Liang ◽  
Ting Wang ◽  
Fangfang Li ◽  
Hua Wang
Keyword(s):  
Polymeric Materials ◽  
Sensitive Detection ◽  
Ideal Class ◽  
Fluorescent Chemosensors ◽  
Aggregation Induced Emission ◽  
Highly Sensitive ◽  
Fluorescent Materials ◽  
Porous Nanoparticles ◽  
Highly Sensitive Detection ◽  
Silicone Polymer

Aggregation-induced emission (AIE) -active polymeric materials have been regarded as an ideal class of fluorescent materials to be widely used as fluorescent chemosensors. Herein, we demonstrate a simple and effective...

A tandem Prins spirocyclization for the stereoselective synthesis of tetrahydrospiro[chroman-2,4′-pyran] derivatives

2016 ◽  
Vol 14 (12) ◽  
pp. 3234-3237 ◽  
Author(s):  
B. V. Subba Reddy ◽  
V. Hanuman Reddy ◽  
Durgaprasad Medaboina ◽  
B. Sridhar ◽  
Y. V. Rami Reddy
Keyword(s):  
Stereoselective Synthesis ◽  
Cascade Process ◽  
Reaction Conditions

A novel cascade process has been developed for the synthesis of tetrahydrospiro[chroman-2,4′-pyran] derivatives by condensation of aldehydes with 2-(5-hydroxy-3-methylenepentyl)phenols using BF3·OEt2 under mild reaction conditions.

scholarly journals Synthesis of biscoumarin derivatives by the reaction of aldehydes and 4-hydroxycoumarin using ruthenium (III) chloride hydrate as a versatile homogeneous catalyst

2012 ◽  
Vol 77 (4) ◽  
pp. 407-413 ◽  
Author(s):  
Khalil Tabatabaeian ◽  
Hannaneh Heidari ◽  
Alireza Khorshidi ◽  
Manouchehr Mamaghani ◽  
Nosrat Mahmoodi
Keyword(s):  
Michael Reaction ◽  
Aqueous Media ◽  
Environmentally Benign ◽  
Homogeneous Catalyst ◽  
Reaction Conditions ◽  
One Pot ◽  
The One ◽  
High Yields ◽  
Chloride Hydrate ◽  
Short Times

The one-pot domino Knoevenagel-type condensation/Michael reaction of aromatic, heteroaromatic and aliphatic aldehydes with 4-hydroxycoumarin in aqueous media in the presence of ruthenium salt as homogeneous catalyst was investigated. It was found that 5 mol% of RuCl3.nH2O catalyzes biscoumarin synthesis in high yields (70-95%) under optimised, mild, green and environmentally benign reaction conditions in short times (25-35min).

Sign in / Sign up

Export Citation Format

Share Document