Strategy to prepare 4-hydroxylphenyl propargyl ether-based benzoxazine from bisphenol A
作者:Chun Chieh Huang、Ching Hsuan Lin、Shenhong A. Dai
DOI:10.1039/c5ra13743h
日期:——
4-Aminophenyl propargyl ether/phenol-based benzoxazine (P-appe) has been reported by many authors. However, to the best of our knowledge, its isomer: 4-hydroxylphenyl propargyl ether/aniline-based benzoxazine (HPPE-a) has never been prepared in the literature. The precursor for HPPE-a, the 4-hydroxylphenyl propargyl ether, is difficult to prepare from hydroquinone without tedious separation because
许多作者已经报道了4-氨基苯基炔丙基醚/酚基苯并恶嗪(P-appe)。然而,就我们所知,其异构体:4-羟基苯基炔丙基醚/苯胺基苯并恶嗪(HPPE-a)尚未在文献中制备。HPPE-a的前体4-羟基苯基炔丙基醚很难在没有繁琐的分离的情况下由对苯二酚制备,因为对苯二酚中的两个羟基的反应性是相同的。在这项研究中,我们报告了制备HPPE-a的简单策略由双酚A通过四步过程制得,包括热解,亲核取代,氧化和曼尼希型缩合。该结构已通过NMR,IR和高分辨率质谱很好地表征。在HPPE-a的DSC热分析图中,在228°C和249°C处观察到两个放热峰。根据IR分析,第一个放热与恶嗪的开环有关,第二个放热与炔丙基醚的克莱森重排有关。由于P-appe和HPPE-a是结构异构体,因此讨论了这两种苯并恶嗪的结构-性质关系。我们发现,HPPE- a热固性塑料的热性能略低于或可与HPPE- a热固性塑料的热性能相媲美。P-