Spontaneous Resolution, Asymmetric Catalysis, and Fluorescence Properties of Δ- and Λ-[Cu(Tzmp)]nEnantiomers from in Situ [2 + 3] Cycloaddition Synthesis

2015 ◽  
Vol 54 (11) ◽  
pp. 5462-5466 ◽  
Author(s):  
Yun-Zhi Tang ◽  
Jian-Bo Xiong ◽  
Ji-Xing Gao ◽  
Yu-Hui Tan ◽  
Qing Xu ◽  
...  
Keyword(s):  
Asymmetric Catalysis ◽  
Spontaneous Resolution ◽  
Fluorescence Properties

Novel phenylacetylene based ketonic resins

2015 ◽  
Vol 44 (4) ◽  
pp. 198-204 ◽  
Author(s):  
N. Kizilcan ◽  
B. Erson
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Technical Information ◽  
Fluorescence Properties ◽  
Formaldehyde Resin ◽  
Step Method ◽  
Content Type ◽  
Naoh Solution ◽  
Copolymer Structure

Purpose – This paper aims to report the synthesis of resins having fluorescence properties, with the help of phenylacetylene (PhAc) by one-step method of in situ modification of ketonic resin. Cyclohexanone-formaldehyde resin (CFR) and acetophenone formaldehyde resin (AFR) were in situ modified with PhAc, in presence of sodium hydroxide (NaOH) by condensation polymerisation. Design/methodology/approach – Ketone, formalin and phenylacetylene were mixed and then 20% aqueous NaOH solution was added to produce the phenylacethylene modified ketonic resin. The solubility, molecular weight and thermal properties of the products were investigated. Findings – These new PhAc-modified ketonic resins (PAc-CFR and PAc-AFR) have fluorescence properties. Research limitations/implications – This study focuses on obtaining a fluorescence resin using a cyclohexanone, acetophenone and PhAc monomer which is an insulator. Practical implications – This study provides technical information for the synthesis of fluorescence comonomers. The modified resins contain acetylene groups. A chemical redox or radical system can be used to polymerise these acetylene groups and resins with much higher molecular weight. The resins may also promote the adhesive strength of a coating and corrosion inhibition to metal surfaces of a coating. Social implications – The resins will be used for the preparation of AB- and ABA-type block copolymers. These block copolymers may exhibit different properties due to incorporation of monomer into the block copolymer structure. Originality/value – PAc-CFR and PAc-AFR have been synthesised in the presence of a basic catalyst. Higher solubility and fluorescence intensity of the modified ketonic resins may increase their applications in the field of electroactive polymers and open new areas. These comonomers have fluorescence property.

Transition-metal-catalyzed nucleophilic dearomatization of electron-deficient heteroarenes

Synthesis ◽  
2021 ◽  
Author(s):  
Jie Jia ◽  
Fangdong Hu ◽  
Ying Xia
Keyword(s):  
Transition Metal ◽  
Asymmetric Catalysis ◽  
Short Review ◽  
Transition Metal Catalysis ◽  
Powerful Method ◽  
Metal Catalysis ◽  
Unique Method ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

Transition-metal-catalyzed nucleophilic dearomatization of electron-deficient heteroarenes, such as pyridines, quinolines, isoquinolines and nitroindoles, has become a powerful method for the access of unsaturated heterocycles in recent decades. This short review summarizes nucleophilic dearomatization of electron-deficient heteroarenes with carbon- and heteroatom-based nucleophiles via transition-metal catalysis. A great number of functionalized heterocycles were obtained in this transformation. Importantly, many of these reactions were carried out in an enantioselective manner by means of asymmetric catalysis, providing a unique method for the construction of enantioenriched heterocycles. 1 Introduction 2 Transition-metal-catalyzed nucleophilic dearomatization of heteroarenes via alkynylation 3 Transition-metal-catalyzed nucleophilic dearomatization of heteroarenes via arylation 4 Transition-metal-catalyzed nucleophilic dearomatization of heteroarenes with other nucleophiles 5 Transition-metal-catalyzed nucleophilic dearomatization with nucleophiles formed in situ 6 Conclusion and outlook

NOVEL VACUUM SYSTEM FOR IN-SITU CHARACTERIZATION OF FLUORESCENCE PROPERTIES OF THIN FILMS

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4445-4448 ◽  
Author(s):  
KOHEI ONOZUKA ◽  
NOBUYUKI IWATA ◽  
HIROSHI YAMAMOTO
Keyword(s):  
Thin Films ◽  
Thermal Evaporation ◽  
Film Surface ◽  
Fluorescence Properties ◽  
Luminescence Properties ◽  
Vacuum System ◽  
In Situ Characterization ◽  
First Time

We constructed a novel vacuum system in which the cathode luminescence properties of as-prepared films can be measured in-situ. It has been observed that the Zn-Ga-O films deposited on 500°C ITO by sputtering emits light with wavelength of about 500 nm from an ultra thin Zn-rich layer formed near film surface. The luminescence induced by irradiation of electrons has also been observed for the first time in the organic bilayered TPD/Alq 3 films prepared in thermal evaporation. Its wavelength blue-shifts by about 120 nm in comparison with the electroluminescence of the same materials. The developed vacuum system is useful to characterize various thin films.

Iodine mediated in situ generation of R-Se–I: application towards the construction of pyrano[4,3-b]quinoline heterocycles and fluorescence properties

2019 ◽  
Vol 17 (40) ◽  
pp. 9039-9049 ◽  
Author(s):  
Khin Myat Noe Win ◽  
Amol D. Sonawane ◽  
Mamoru Koketsu
Keyword(s):  
Fluorescence Properties ◽  
In Situ Generation

Iodine mediated in situ generation of R-Se–I and its application towards the construction of pyrano[4,3-b]quinolin-1-one derivatives.

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