Nanoparticles tungstophosphoric acid supported on polyamic acid: catalytic synthesis of 1,8-dioxo-decahydroacridines and bulky bis(1,8-dioxo-decahydroacridine)s
摘要:
制备了聚氨基甲酸酯(TPA NPs/PAA)支撑的钨磷酸纳米颗粒,并将其用作催化剂,用于在乙醇-水溶液中通过 5,5-二甲基-1,3-环己二酮和各种醛与苯胺或醋酸铵的一锅缩合反应,方便地选择性合成 1,8-二氧代十氢吖啶和一些笨重的双(1,8-二氧代十氢吖啶)。该催化剂通过傅立叶变换红外光谱(FT-IR)、X 射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、热重分析(TG)、能量色散 X 射线分析(EDAX)和电感耦合等离子体光发射光谱(ICP-OES)进行了表征。催化剂具有很高的热稳定性和良好的重复使用性。在所述反应条件下,产物分离纯度高,催化剂在简单的操作过程中即可轻松分离,并可多次循环使用而不会明显丧失活性。该反应的特点是反应时间短、效率高、反应条件温和。
Tungstophosphoric acid nanoparticles supported on polyamic acid: A mild and recoverable heterogeneous catalyst for the selective synthesis of mono and bulky bis(1,8-dioxooctahydroxanthene)s under solvent-free conditions
作者:Masoud Nasr-Esfahani、Zahra Rafiee、Hassan Kashi
DOI:10.1080/10426507.2015.1100185
日期:2016.5.3
8-dioxooctahdroxanthene) were selectively synthesized using tungstophosphoricacid nanoparticles supported on polyamic acid (TPA/PAA) as a new catalyst in solvent-freeconditions. The high purity products were isolated and catalyst was easily separated in simple work-up and was recycled several times without loss of reactivity under the described reaction conditions. The reaction is characterized by short reaction
Record material using vinyl carbinol color formers
申请人:The Wiggins Teape Group Limited
公开号:US05364830A1
公开(公告)日:1994-11-15
Pressure or heat sensitive record materials with color-former sublimation problems reduced or eliminated whilst not reducing the color forming capability per unit weight of color former by providing what are in effect dimers of vinyl carbinols, with the vinyl carbinol residues, linked through the aryl groups of a diaryl amine.