Imprint of free space around acid site in hollow mesoporous polymeric solid acid and application in heterogeneous acetal hydrolysis/asymmetric aldol tandem reaction
作者:Yanan Bo、Xuri Wang、Xintao Deng、Xuebing Ma
DOI:10.1016/j.apcata.2019.117360
日期:2020.1
acid-base reaction to afford multifunctional nano-bowl Poly(St/SO3H) HMOBs with 0.34 mmol g-1 of loaded CDNH2 and 1.77 mmol g-1 of acid capacity. In heterogeneous acetal hydrolysis/asymmetric aldol tandem reaction, Poly(St/SO3H-CDNH2) HMOBs displayed moderate to excellent catalytic performances (90–95% yields, anti/syn = 81/19–95/5 and 74–97%ee anti) for the starting benzaldehyde methyl acetals bearing
以受控的方式在催化位点附近自由空间对于提高反应物在非均相催化中对催化位点的可及性非常有吸引力。本文通过附着的硫脲鎓/ Co(OH)2络合物的水解和Co /(OH)的形成/去除,构建了空心聚合物纳米碗中孔壳中潜酸位点(-SH)周围的自由空间。2致孔剂在壳中。在H 2 O 2氧化–SH部分后,可以通过9-氨基-(9-脱氧)辛可尼定(CDNH 2)通过酸碱反应将所得的空心中孔碗状聚合固体酸方便地官能化为提供多功能纳米碗Poly(St / SO 3H)具有0.34mmol g -1的负载的CDNH 2和1.77mmol g -1的酸容量的HMOB 。在非均相缩醛水解/不对称醛醇串联反应中,Poly(St / SO 3 H-CDNH 2)HMOB显示出中等至出色的催化性能(90-95%的收率,anti / syn = 81 / 19-95 / 5和74-97起始苯甲醛甲基乙缩醛在o,m和p位带有吸电子取代基(R