Reactions of 9-Phenylxanthylium Salts with Organometallic Reagents. I
作者:MIKIO HORI、TADASHI KATAOKA、YUTAKA ASAHI、EIJI MIZUTA
DOI:10.1248/cpb.21.1318
日期:——
A close examination was made on the reactions between 9-phenylxanthylium salt (I) and various Grignard reagents, such as C6H5MgBr, o-and p-CH3OC5H4MgBr, and CH3MgI. It was found that the 9-phenylxanthyl radical (IX) is formed in these reactions as an intermediate ; from which 9-phenyl-9-substituted xanthenes are formed. 9-Phenylxanthenes V and VIII, which are derived from IX, are formed simultaneously. The electron spin resonance spectrum of the radical IX was analyzed by the McLachlan SCF-MO computation. Mechanism of the reaction of I with Grignard reagents were discussed in detail. The reaction between II and Grignard reagents gave the products similar to those of the reaction between I and Grignard reagents. It was confirmed that radical routes are related with the reaction mechanism to a considerable extent.
对 9-苯基黄基鎓盐 (I) 与各种格氏试剂(例如 C6H5MgBr、o-和 p-CH3OC5H4MgBr 和 CH3MgI)之间的反应进行了仔细研究。发现9-苯基黄基自由基(IX)在这些反应中作为中间体形成;由其形成9-苯基-9-取代的呫吨。衍生自IX的9-苯基呫吨V和VIII同时形成。通过McLachlan SCF-MO计算分析了自由基IX的电子自旋共振谱。详细讨论了I与格氏试剂的反应机理。 II 与格氏试剂之间的反应得到的产物与 I 与格氏试剂之间的反应相似。证实自由基路线与反应机理有相当大的关系。