have been prepared and successfully used as microreactors to control the regioselectivity of the photocycloaddition of five 9-substituted anthracences [AnCH(2)N(+)(CH(3))(3)Br(-) (1), AnCH(2)COO(-)Na(+) (2), AnCH(2)CH(2)COOH (3), AnCH(2)OH (4), AnCH(3) (5), where An = 9-anthryl]. While the photocycloaddition of the five substrates in methanol mainly gave rise to their head-to-tail (h-t) photocyclomers
[反应:见正文]制备了具有3-
铵丙基残基的改性
二氧化硅纳米颗粒,并成功地用作微反应器,以控制5个9-取代的
蒽环化合物[AnCH(2)N(+)(CH(3) ))(3)Br(-)(1),AnCH(2)COO(-)Na(+)(2),AnCH(2)CH(2)COOH(3),AnCH(2)OH(4) ,AnCH(3)(5),其中An = 9-
蒽基]。虽然五种底物在
甲醇中的光环加成主要产生了它们的头对尾(ht)光环聚物,但掺入改性
二氧化硅在
甲醇中的悬浮液中照射的1-4几乎只产生了头对头(hh )具有高量子产率的光环聚合物。