α-Halogenation of triphenylene-based discotic liquid crystals: towards a chiral nucleus
作者:Neville Boden、Richard J. Bushby、Andrew N. Cammidge、Sarah Duckworth、Gareth Headdock
DOI:10.1039/a606447g
日期:——
In an attempt to prepare chiral discotic liquid crystals based on a
helically twisted triphenylene nucleus a route has been developed for the
introduction of α-fluoro, -chloro and -bromo substituents and it is
shown that multiple α-halogenation is also possible. The
monosubstituted derivatives all show enhanced mesophase stability whilst
formation of the mesophase is suppressed for the polyhalogenated
derivatives. Rather surprisingly, reaction of
2,3,6,7,10,11-hexahexyloxytriphenylene (HAT6) with iodine monochloride
results in chlorination rather than iodination.
为了在螺旋扭曲的三亚苯核基础上制备手性盘状液晶,我们开发了一条引入 δ-氟、-氯和-溴取代基的路线,并证明了多重 δ-卤化也是可行的。单取代衍生物都显示出更强的介相稳定性,而多卤化衍生物则抑制了介相的形成。令人惊讶的是,2,3,6,7,10,11-六己氧基三亚苯(HAT6)与一氯化碘反应的结果是氯化而不是碘化。