41159-02-8Relevant articles and documents
Phosphorylated Polyacrylonitrile Fibers as an Efficient and Greener Acetalization Catalyst
Xu, Gang,Cao, Jian,Zhao, Yali,Zheng, Lishuo,Tao, Minli,Zhang, Wenqin
supporting information, p. 2565 - 2575 (2017/09/25)
A novel solid acid catalyst (PANEAPF) is developed by immobilization of phosphoric acid on polyacrylonitrile fiber through covalent bonding. Various characterization techniques such as elemental analysis (EA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), etc. are utilized to confirm the successful grafting and the stability of the fiber catalysts during application. PANEAPF shows high catalytic activity in the acetalization of aldehydes owing to the high utilization efficiency of its functionalized acid sites. In addition, the strong polarity micro-environment in the surface layers of PANEAPF make it highly suitable for catalytic application in both water and alcohol. Furthermore, the fiber catalyst can be applied to the acetalization of aldehydes in a continuous-flow process at room temperature, and shows excellent reactivity and superior recyclability (over 20 times). The many advantages of PANEAPF such as simple preparation, convenient regulation of acid amount, high durability, and eco-friendly process make it very attractive for fixed-bed reactors in the chemical industry.
Efficient thioacetalisation of carbonyl compounds
Habibi, Davood,Rahmani, Payam,Akbaripanah, Ziba
, p. 417 - 421 (2014/01/06)
The thioacetalisation of a variety of heterocyclic, aromatic, and aliphatic carbonyl compounds (1 mmol) with ethane-1,2-dithiol (1 mmol) using silica sulphuric acid (SSA) is presented as an efficient heterogeneous catalyst under mild and solvent-free cond
Synthesis of functionalized chlorins sterically-prevented from self-aggregation
Dos Santos, Fabiane A.B.,Uchoa, Adjaci F.,Baptista, Mauricio S.,Iamamoto, Yassuko,Serra, Osvaldo A.,Brocksom, Timothy J.,De Oliveira, Kleber T.
, p. 402 - 411 (2013/10/08)
The synthesis of six new regioisomeric chlorin derivatives sterically-prevented from self-aggregation is described. The compounds were prepared by the Diels-Alder reaction between protoporphyrin IX dimethyl ester, and N-[p-(1,3-dithiolan)phenyl]maleimide and N-(p-formylphenyl)maleimide. The protopophyrin IX dimethyl ester was synthesized in 2 steps from natural hematoporphyrin using a modified procedure from literature, and the substituted maleimides were conveniently synthesized, aiming at producing formyl-chlorins for subsequent functionalization with amphiphilic groups. The Diels-Alder reactions were systematically studied in order to establish optimized conditions for the cycloadditions. The regioisomers were fully characterized and the aggregation studies were performed by NMR, UV-Vis spectroscopy, and also HRMS (ESI-TOF and MALDI-TOF). Preliminary evaluations on the photosensitizing activities and amphiphilicity were carried out indicating that these new compounds are potential candidates, to be studied in more advanced tests of Photodynamic Therapy (PDT). This work represents on advance on our previous study, with respect to these new structures, their photophysical properties and amphiphilicity.
