Electrocyclic reaction

Three new photochromic compounds, 3-(2,5-dimethyl-3-thienyl)-4-(2-phenyl-5-methyl-4-thiazolyl)-1,8-naphthalimide (1-O), 2,3-bis(2-phenyl-5-methyl-4-thiazolyl)-7H -benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (2-O), and 2,5- dimethyl-3-thienyl)-7H -benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (3-O), were synthesized and their photochromic properties were studied. Compound 1-O was synthesized by two consecutive Suzuki coupling reactions using 2,5- dimethylthiophene-3-boronic acid and 5-methyl-2-phenylthiazole-4-boronic acid.

9p tudichquannguyet 29-11-2021 2 1   Download

Finding novel cholinesterase inhibitors that would be able to cross the blood–brain barrier, have favorable pharmacokinetic parameters, and reduce hepatotoxicity along with other side effects has been the main focus of investigations dealing with Alzheimer disease. In this study we evaluated cholinesterase inhibitory and antioxidant activity of seven oxazole derivatives. These compounds have been efficiently and sustainably prepared by photochemical electrocyclization reaction.

7p tudichquannguyet 29-11-2021 10 2   Download

Continuous concerted reorganisation of electrons, 5 major categories: Electrocyclic ring opening closure, cycloaddition, cycloreversion reactions, cheletropic reactions,... is the main content of the lesson chapter 10 "Pericyclic Reactions 周环反应". Invite you to consult.

43p nguyenphong201 11-12-2015 36 2   Download