Amino-modified periodic mesoporous biphenylene-silica

Abstract

The amination reaction of biphenylene moieties in crystal like mesoporous silica (Bph PMO) is successfully achieved with a density of 3.17 mmol g 1. The amination occurs approximately in every aro matic ring of the biphenylene bridge in the position 2 and 20 , leading to above 50% of the biphenylene group di aminated. The structural integrity of the synthetized material is preserved during the strong acid treatment to achieve the amine funcionalization of Bph PMO. The aminated mesoporous organo silica is highly active (initial turnover frequency 2193 h 1 or 37 min 1) and almost 100% selective in the Kn€oevenagel condensation. Moreover, the amine modified periodic mesoporous biphenylene silica is effective for direct metal coordination.