Bulky substituents

Polyimides are known as high performance polymers that are widely used in optoelectronic devices as well as other high engineering applications. Among polyimides, in particular transparent and colorless polyimides (CPIs) are recently in high demand in optoelectronic industries because of their transparency as well as balanced thermo-mechanical properties.

10p vidudley 20-02-2023 3 2   Download

Calix[4]pyrrole derivatives with bulky substituents at their meso-positions were synthesized via mixed condensation of pyrrole with cyclohexanone and acetophenone derivatives. Anion binding studies, carried out by isothermal titration calorimetry in 1,2-dichloroethane with Cl− and CH3CO−2 anions in the form of their tetrabutylammonium salts, revealed that these new calix[4]pyrrole derivatives can bind the aforementioned anions as effectively as the unsubstituted “parent” system, octamethylcalix[4]pyrrole (1).

15p tudichquannguyet 29-11-2021 2 0   Download

Synthesis of 6-isomer of 5,8-O-dimethyl ether of shikonin (13), a promising anticancer scaffold, always remains a huge challenge. Herein a key intermediate for 13, 2-(1-hydroxyl-4-methyl-3-pentenyl)-1,4,5,8-tetramethoxynaphthalene (10), was obtained on the large-scale synthesis

8p vijiraiya2711 27-05-2020 14 1   Download