96308-77-9Relevant academic research and scientific papers
How Does the Hydrogen Bonding Interaction Influence the Properties of Polybenzoxazine? An Experimental Study Combined with Computer Simulation
Shen, Xiaobin,Cao, Lijun,Liu, Yuan,Dai, Jinyue,Liu, Xiaoqing,Zhu, Jin,Du, Shiyu
, p. 4782 - 4799 (2018/07/23)
The formation of intra- or intermolecular hydrogen bonding and their influences on polybenzoxazine's properties were investigated after the model benzoxazine monomers (o-AB-fbz, o-AF-fbz, o-AP-fbz, p-AB-fbz, p-AF-fbz, p-AP-fbz) were synthesized. Because of the different electron-donating abilities of bridging units (benzene, furan and pyridine) in isophthalic acid (IPA), 2,5-furandicarboxylic acid (2,5-FDCA) and 2,6-pyridinedicarboxylic acid (2,6-PDCA), the strength of intramolecular H-bonding involved with the oxygen atom in oxazine ring in o-AB-fbz, o-AF-fbz and o-AP-fbz followed the order of o-AB-fbz > o-AF-fbz > o-AP-fbz, and the strength of the overall H-bonding was arranged as follows: o-AB-fbz g), and the influence of H-bonding on Tg was revealed by in situ FT-IR analysis. Molecular dynamics (MD) simulation was also applied to investigate the properties of synthesized polybenzoxazines and similar results were obtained. Not only the formation of H-bonding but also their effects on both the curing behaviors of benzoxazine monomers and the thermal properties of cured resins were systematically investigated, which would help us understand polybenzoxazines more deeply and might be a guideline for improving their comprehensive properties only by manipulating the H-bonding.
Synthesis of [Zn(II)BHPPDAH] as new heterogeneous catalyst without being immobilized on any support and applied for mannich reaction
Khalifeh, Reza,Sharghi, Hashem,Rashidi, Zahra
, p. 372 - 383 (2013/09/23)
In this paper, a novel heterogeneous complex of zinc with N,N-bis(2-hydroxyphenyl)pyridine-2,6-dicarboxamide(BHPPDAH) was synthesized. The catalyst was found to be a highly effective catalyst for the three-component coupling reactions of aldehydes, alkynes, and amines (A3 coupling) via C-H activation. The reactions could be applied to both aromatic and aliphatic aldehydes and alkynes. Nearly quantitative yields of the desired products were obtained in most cases. The reaction proceeds without any cocatalyst or activator, and water is the only byproduct. The catalyst was quantitatively recovered from the reaction by a simple filtration and reused for five cycles with almost consistent activity.
Synthesis of complexes with the polydentate ligand N,N′-bis(2- hydroxyphenyl)-pyridine-2,6-dicarboxamide
Pérez, Yolanda,Johnson, Andrew L.,Raithby, Paul R.
experimental part, p. 284 - 292 (2011/02/27)
The pentadentate ligand N,N′-bis(2-hydroxyphenyl)-pyridine-2,6- dicarboxamide (POPYH4) has been used to prepare a variety of new complexes [HNEt3]2[Zn4Cl(POPYH)3] (2), [HNEt3][PdCl(POPYHsu
Copper-catalyzed one-pot synthesis of benzimidazole derivatives
Sharghi, Hashem,Hosseini-Sarvari, Mona,Moeini, Fatemeh
experimental part, p. 1044 - 1051 (2009/02/08)
A simple, efficient, and environmentally benign method has been developed for the synthesis of 2-substituted benzimidazoles through a one-pot reaction of phenylenediamines with ary1 aldehydes in excellent isolated yields under mild conditions using Cu(II) complex as the selective, recyclable, and heterogeneous catalyst at ambient temperature. The Cu(II) complex as a heterogeneous catalyst can be reused in further catalytic reactions, and it was found that its activity remained largely unchanged for eight successive runs. No metal-complex leaching was observed after the consecutive catalytic reactions. The salient features of this method include mild conditions, high yields, simple procedure, and good recovery and reusability of the heterogeneous catalyst.
Eine einfache Methode zur Herstellung von Benzoxazolen
Seha, Zdenek,Weis, Claus D
, p. 413 - 419 (2007/10/02)
The preparation of benzoxazoles by a facile one-pot reaction is reported.The reaction of carboxylic acids with 2-chloro-N-methyl-Δ1-pyrrolinium chloride in an excess of N-methyl-2-pyrrolidone afforded carboxylic acid chlorides which were converted subsequently to their 2-hydroxyanilides by addition of 2-aminophenols.Cyclization of the 2-hydroxy-anilides at elevated temperatures furnished the benzoxazoles in high yield and purity.
