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Inexpensive, operationally simple flow reactor for rapid, chromatography free synthesis of siloxane based liquid crystals†
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2018-05-30 00:00:00 , DOI: 10.1039/c8re00027a
Richard J. Mandle 1, 2, 3, 4 , John W. Goodby 1, 2, 3, 4
Affiliation  

We report on the hydrosilylation of terminal alkenes in flow using a “Karstedt-like” platinum-on-silica catalyst. A solution of alkene and siloxane in toluene was passed through the catalyst bed using a low pressure pump; the use of a high catalyst loading delivers quantitative β-addition of the siloxane to the alkene, hence the only purification required is removal of volatiles (toluene and siloxane). Following optimisation we synthesise a family of liquid crystalline siloxane terminated cyanobiphenyls, finding their properties to compare favourably to literature examples. The system and catalyst described is inexpensive, reusable, and chromatography free and thus prominently sustainable.

中文翻译:

廉价,操作简单的流动反应器,可快速,无色谱合成硅氧烷基液晶

我们报告了使用“ Karstedt样”硅基铂催化剂对流动中的末端烯烃的氢化硅烷化反应。使用低压泵使烯烃和硅氧烷在甲苯中的溶液通过催化剂床。高催化剂负载量的使用可将硅氧烷定量地添加到烯烃中,因此唯一需要的提纯是去除挥发物(甲苯和硅氧烷)。经过优化后,我们合成了一系列液晶硅氧烷封端的氰基联苯,发现其性能可与文献实例相比较。所描述的系统和催化剂是廉价的,可重复使用的,并且没有色谱法,因此具有显着的可持续性。
更新日期:2018-05-30
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