Synthesis of bis(3-{[2-(allyloxy)ethoxy]methyl}-2,4,6-trimethylbenzoyl)(phenyl)phosphine oxide – a tailor-made photoinitiator for dental adhesives
作者:Norbert Moszner、Iris Lamparth、Jörg Angermann、Urs Karl Fischer、Frank Zeuner、Thorsten Bock、Robert Liska、Volker Rheinberger
DOI:10.3762/bjoc.6.26
日期:——
was chlorinated. The formed acid chloride showed an unexpected low thermal stability. Its thermal rearrangement at 180 degrees C resulted in a fast formation of 3-(chloromethyl)-2,4,6-trimethylbenzoic acid 2-(allyloxy)ethyl ester. In the third step, the acid chloride was reacted with phenylphosphine dilithium with the formation of bis(3-[2-(allyloxy)ethoxy]methyl}-2,4,6-trimethylbenzoyl)(phenyl)phosphine
由于市售双酰基氧化膦在牙科酸性水性底漆配方中的溶解性差,双(3-[2-(烯丙氧基)乙氧基]甲基}-2,4,6-三甲基苯甲酰基)(苯基)氧化膦 (WBAPO)以 3-(氯甲基)-2,4,6-三甲基苯甲酸为原料,经二氯膦途径合成。通过用2-(烯丙氧基)乙醇醚化引入取代基。在第二步中,3-[2-(烯丙氧基)乙氧基]甲基}-2,4,6-三甲基苯甲酸被氯化。形成的酰氯表现出出乎意料的低热稳定性。其在 180 摄氏度的热重排导致 3-(氯甲基)-2,4,6-三甲基苯甲酸 2-(烯丙氧基) 乙酯的快速形成。第三步,酰氯与苯基膦二锂反应生成双(3-[2-(烯丙氧基)乙氧基]甲基}-2,4,6-三甲基苯甲酰基)(苯基)膦,被氧化为 WBAPO。WBAPO 的结构经 (1) H NMR、(1)(3)C NMR、(3)(1)P NMR、红外光谱以及元素分析证实。WBAPO 是一种黄色液体,在极性溶剂中具有