50966-77-3Relevant articles and documents
Push-pull second harmonic generation chromophores bearing pyrrole and thiazole heterocycles functionalized with several acceptor moieties: Syntheses and characterization
Castro, M. Cidália R.,Belsley,Raposo, M. Manuela M.
, p. 89 - 95 (2016)
A new series of push-pull nonlinear optical (NLO) chromophores 2 and 3 were synthesized in order to study the variations produced in the optical properties of the compounds by linking different electron accepting moieties to the pyrrolyl-thiazole system at position 5 of the electron deficient thiazole heterocycle. The final donor-acceptor systems 3a-c were synthesized by a modification of the Paal-Knorr synthesis (the Clauson-Kaas reaction) followed by Knoevenagel reaction of the precursor aldehydes 2a-c with active methylene molecules. Hyper-Rayleigh scattering in dioxane solutions using a fundamental wavelength of 1064 nm was employed to evaluate their second-order nonlinear optical properties. An indanone dicyanovinyl derivative 3c exhibited the largest first hyperpolarizability (β = 970 × 10-30 esu, using the T convention) as well the highest value of decomposition, Td = 300 °C thus indicating its potential application as a second harmonic generation (SHG) chromophore.
Iron-catalyzed inexpensive and practical synthesis of N-substituted pyrroles in water
Azizi, Najmedin,Khajeh-Amiri, Alireza,Ghafuri, Hossein,Bolourtchian, Mohammad,Saidi, Mohammad Reza
experimental part, p. 2245 - 2248 (2009/12/03)
An operationally simple, practical, and economical protocol for iron(III) chloride catalyzed Paal-Knorr pyrrole synthesis in water in good to excellent yields has been developed. Several N-substituted pyrroles are readily prepared from the reaction of 2,5-dimethoxytetrahydrofuran and aryl/alkyl, sulfonyl and acyl amines under very mild reaction conditions. Georg Thieme Verlag Stuttgart.
