54006-56-3Relevant academic research and scientific papers
Cellulose sulfonic acid as a green, efficient, and reusable catalyst for Nazarov cyclization of unactivated dienones and pyrazoline synthesis
Daneshfar, Zahra,Rostami, Ali
, p. 104695 - 104707 (2015)
A high yielding, eco-friendly and simple procedure for the synthesis of five membered carbo- and heterocycles through cellulose sulfonic acid (CSA) mediated electrocyclization processes has been developed. Cellulose sulfonic acid (CSA) not only was able to induce the cyclization of "unactivated" dienones generating cyclopentenoids; it was also able to trigger the cyclization of α,β-unsaturated hydrazones giving rise to pyrazolines in excellent yields under green reaction conditions. The ease of catalyst recovery and reusability, short reaction time, simple experimental and work-up procedure; compared to the conventional methods, makes this protocol practical, environmentally friendly and economically desirable. The cellulose-SO3H (CSA) was characterized by FT-IR spectroscopy, powder X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) analyses, and catalyst stability was judged by thermogravimetry/differential thermal analysis (TG/DTA). The catalyst can be recycled several times without significant loss of catalytic activity.
Synthesis of 1,5-diaryl-3-arylethenyl-2-pyrazolines under ultrasound irradiation
Li, Ji-Tai,Zhai, Xin-Li,Meng, Xian-Tao
experimental part, p. 589 - 592 (2010/10/03)
Synthesis of 1,5-diaryl-3-arylethenyl-2-pyrazolines via the reaction of 1,5-diaryl-1,4-pentadien-3-one and phenyl hydrazine in glacial acetic acid was carried out in 32-80 % yields under ultrasound irradiation. This procedure has the advantages of mild conditions, short reaction time and high yield.
