Highly Regioselective Solid-State Photodimerization of Naphthoquinolizinium Salts
作者:Heiko Ihmels、Christian J. Mohrschladt、Andreas Schmitt、Milena Bressanini、Dirk Leusser、Dietmar Stalke
DOI:10.1002/1099-0690(200208)2002:15<2624::aid-ejoc2624>3.0.co;2-q
日期:2002.8
The photodimerization of benzo-annellated acridizinium derivatives, namely naphtho[1,2-b]quinolizinium and naphtho[2,1-b]quinolizinium bromide, has been investigated in solution and in the solid state. Irradiation of the naphthoquinolizinium salts in solution gave all possible regioisomers in an unselective [4+4] photocycloaddition reaction. In contrast, the irradiation of crystalline samples resulted
苯并稠合acridizinium衍生物的光二,即萘并[1,2 b ] quinolizinium和萘并[2,1- b ] quinolizinium溴化物,已在溶液中和在固体状态进行了研究。溶液中萘喹啉鎓盐的辐照在非选择性的[4 + 4]光环加成反应中给出了所有可能的区域异构体。相反,结晶样品的照射导致区域选择性二聚化,从而得到反头对尾的光电二聚体。结晶相中的反应性很大程度上取决于用于结晶的溶剂。在X射线衍射分析的基础上讨论了结果,结果表明,固态的光二聚化的选择性是抗二聚体的结果。晶体状态的分子对从头到尾的预组织。(©Wiley-VCH Verlag GmbH,69451 Weinheim,Germany,2002)