The extension of the pyrene ring from dimethyl 2,2′‐(pyrene‐1,6‐diyl)dibenzoate derivatives by an intramolecular Friedel–Crafts acylation can be realized in an efficient and regioselective manner using triflic acid as proton source. Naphtho‐tetracenone derivatives are obtained in high yields at room temperature while Bis‐tetracene‐diones are prepared upon heating. Both products display interesting
使用
三氟甲磺酸作为质子源,可以高效且区域选择性地实现分子内的Friedel-Crafts酰化作用从2,2'-(-1,6-二苯基)二
苯甲酸二甲酯衍
生物中the环的延伸。在室温下可以高产率地得到
萘并四烯酮衍
生物,而加热时可以制备双并四烯二酮。两种产品均在可见光范围内显示出有趣的荧光性质,量子产率在50%至60%之间变化。