o-，m-，p-IC6H4OCH3的电子结构和取代基效应

Electron structure and substituent effects of o-,m-,p-IC_6H_4OCH_3 iodoanisoles

采用紫外光电子能谱(UPS)手段结合理论计算研究了有机卤化物o-,m-,p-IC6H4OCH3的电子结构和取代基效应.在碘原子和甲氧基两个供电子基团的共同作用下,这三种碘代苯甲醚的第一电离能均低于相应的碘苯和苯甲醚.通过取代基效应研究表明碘代苯甲醚为富电子体,因此在有机合成反应中具有较高的反应活性.

The electronic structures and substituent effects of o-, m-, and p- iodoanisoles were measured by ultraviolet photoelectron spectroscopy （UPS）. Combined the empirical arguments and theoretical methods, the observed UPS bands were interpreted. Owing to the effects of electron donating nature of both substituents, the first ionization potential of three iodoanisoles are lower than that of iodobenzene and anisole. The two substituents of iodoanisoles lead to the electronrich of the molecules, which might contribute to the high reactivity of iodoanisoles in a number of organic reactions.