Wyniki wyszukiwania - BazTech

1

Synthesis of tetrahydroquinolines and quinoline derivatives through the Lewis acid catalysed Povarov reaction: A comparative study between multi step and multi-component methods

Hellel Djamila, Chafaa Fouad, Nacereddine Abdelmalek Khorief

Scientiae Radices

|

2023

|

Vol. 2, Iss. 3

295--308

EN

In this work, we have synthesised a new disubstituted tetrahydroquinolines by the Povarov [4+2] cycloaddition reaction between imines derivatives and an electron-rich olefin such as vinyl ethers. These reactions were carried out in the presence of different acid catalysts in its two versions, multi-step reaction starting with imine synthesis and multi-component reaction in which the imine is formed in situ. The reactivity of the cycloaddition reaction is directly attributed to the nature of the reagents, the used synthetic strategy, in which the obtained yield is found in the case of multi-step reactions lower than that in the multi-component reaction one. Additionally, the multi-step reactions are faster kinetically in comparison with that of the multi-component one. The nature of the catalyst directly increases the rate and enhances the yield of the reactions.

2

Symmetrical and asymmetrical imino-naphthalimides in perovskite solar cells

Korzec Mateusz, Kotowicz Sonia, Pająk Agnieszka Katarzyna, Schab-Balcerzak Ewa

Opto-Electronics Review

|

2021

|

Vol. 29, No. 4

175--180

EN

In perovskite solar cells, series of symmetrical and asymmetrical imino-naphthalimides were tested as hole-transporting materials. The compounds exhibited high thermal stability at the temperature of the beginning of thermal decomposition above 300 °C. Obtained imino-naphthalimides were electrochemically active and their adequate energy levels confirm the application possibility in the perovskite solar cells. Imino-naphthalimides were absorbed with the maximum wavelength in the range from 331 nm to 411 nm and emitted light from the blue spectral region in a chloroform solution. The presented materials were tested in the perovskite solar cells devices with a construction of FTO/b-TiO2/m-TiO2/perovskite/ HTM/Au. For comparison, the reference perovskite cells were also performed (without hole-transporting materials layer). Of all the proposed materials tested as hole-transporting materials, the bis-(imino-naphthalimide) containing in core the triphenylamine structure showed a power conversion efficiency at 1.10% with a short-circuit current at 1.86 mA and an open-circuit voltage at 581 mV.

3

Macrocycles in Supramolecular Chemistry: from Dynamic Combinatorial Chemistry to Catalysis

Lüning U.

Polish Journal of Chemistry

|

2008

|

Vol. 82, nr 6

1161-1174

EN

Macrocycles can be synthesized under kinetic or thermodynamic control, the latter leading to mixtures in equilibrium. Their composition can be controlled by addition of templates. Alkaline earth metal ions have been used to synthesize imine macrocycles of different sizes from dialdehydes and diamines specifically. In addition, the competition between the formation of a macrocycle or a bimacrocyclic cage compound can be controlled by a proper template ion. Also organic templates such as polyols can be used to stabilize a resulting macrocycle. As recognition reaction, the formation of boronic esters is presented, the macrocyclization was achieved by ring-closing metathesis. Due to the templates, endo-functionalized macrocycles are achieved, such as concave acids or bases, metal ion complexes and even N-heterocyclic carbenes. All of these can be part of a concave structure which determines their reactivity and selectivity in reactions such as acid/base catalysis, metallo-or-organocatalysis.