A new polyamine was prepared by the ring opening polymerization of epichlorohydrin and properly characterized. The catalytic property of the prepared polymer was assessed by synthesizing 2‐aryl‐substituted benzimidazole and benzoxazole derivatives by the conjugation of o‐phenylenediamine/o‐aminophenol with various aromatic aldehydes in the presence of atmospheric oxygen. Significant attributes of the present synthesis include short reaction time, good to excellent yield, high purity, easy reusability, and room temperature reaction. The reaction was carried out in the absence of any metal catalyst and other cooxidants.
A copper complex of chiral modified dendrigraft amidoamine polymer with a pentaerythritol initiated polyepichlorohydrin core, PEN-G2, on a solid resin support is employed in the synthesis of isoquinuclidines via aza Diels–Alder reaction between cyclohexenone and imines.
Two 3,4-ethylenedioxythiophene (EDOT) based low band gap donor-acceptor (D-A)conjugated copolymers were designed and synthesized via direct arylation, in which the HOMO-LUMO gaps were fine-tuned by the regular insertion of electron deficient units, 2,1,3-benzothiadiazole (BTZ) and 2,1,3-benzoselenadiazole (BTSe), respectively. Structural characterization was performed by FT-IR, 1 H NMR and XPS. In order to investigate the variation in energy band structure of the copolymers, quantum-chemical calculation using density functional theory was carried out. The alternating insertion of chalcogenadiazole unit in the PEDOT (poly(3,4-ethylenedioxythiophene)) lowers the HOMO and LUMO energy levels. As a result, the polymers with lower band gap compared to that of the homopolymer, PEDOT was obtained. Optical and electrochemical results confirmed that BTSe is marginally superior to BTZ in EDOT based alternate donor-acceptor copolymers. Present experimental results correlate with HSE06 level theoretical calculations than those with B3LYP level. Zscan experiments reveal that the copolymers exhibit strong nonlinear absorption coefficient and nonlinear refraction coefficient of the order 10 -10 esu and the third-order nonlinear susceptibility is of the order of 10 -11 esu. These findings indicated that the EDOTchalcogenadiazole copolymers can be developed into excellent third-order nonlinear optical material.
A highly functionalized heterogeneous copper loaded dendrigraft amidoamine catalyst for the synthesis of 2-substituted and 2,2-disubstituted benzimidazoles is reported.
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