作者:Adam Wu、Brian O. Patrick、Enoch Chung、Brian R. James
DOI:10.1039/c2dt31065a
日期:——
which then undergoes hydrogenolysis of the C–O bond to give 14 and 17. Hydrogenolysis of 4 to 14 and 17 also occurs using the Ru catalyst under 1 atm H2; in contrast, use of 3-hydroxy-2-(2-methoxyphenoxy)-1-phenyl-1-propanone (7), for example, where the CH2 of 4 has been changed to CHCH2OH, gives a low yield (≤15%) of hydrogenolysis products. Similarly, the diol substrate, 2-(2-methoxyphenoxy)-1-phenyl-1
的所谓的木质素使用钌催化剂XANTPHOS模型二聚体氢解反应呈现(XANTPHOS = 4,5-双(二苯基膦基)-9,9-二甲基x吨)。例如,一些九种型号研究,醇,2-(2-甲氧基苯氧基)-1-苯基乙醇(1)中,用5摩尔%的Ru(H)2(CO)(PPH 3)(XANTPHOS)(18)在甲苯-d 8,在135℃下氮气氛下20小时2,在约95%给出产生C-O裂解氢解产物,苯乙酮(14)和愈创木酚(17),以及酮,2-(2-甲氧基苯氧基)-1-苯基乙酮(少量(<5%)4),如通过观察到的1个H NMR光谱。在原位的Ru(H)2(CO)(PPH 3)3 / XANTPHOS系统给出了类似的结果,证实了最近的一份报告(JM尼科尔斯等人。,J。化学会志。,2010,132,12554)。活性催化剂被配制“为方便起见,”为“的Ru(CO)(XANTPHOS)”。氢解机制前进通过初始脱氢得到酮4,其然后