フリーデル・クラフツ・アシル化反応中間体

抄録

In relation to Friedel-Crafts acylation, complexes of (ArH·MX₃), (ArH·HX·MX₃), and (RCOX·MX₃) were chronologically reviewed on their structual formulations up to date. Properties of their complexes and their roles in the reaction were explained in terms of their differences between π-and σ-type structure. The X-ray crystal analytical results were quoted to make clear the structual small changes between π-axial and π-edgewize complexes and between ionic and nonionic complexes of (RCOX·MX₃), and also to demonstrate the characteristics of σ-complex. From the recent results obtained in nonconventional attack at ipso position, some comment was added about the difficulty of finding structual relationship between intermediate complexes and products.