Peaceful coexistence: Brønsted acids and bases were attached to different surfaces of a mesoporous silica nanoparticle. The internal surface was functionalized by using co-condensation, and postsynthesis grafting was used to functionalize the external surface. A two-step reaction sequence that cannot proceed with an acid and base in the same pot was accomplished using the bifunctionalized nanoparticle (see scheme).
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Huang et al. (2010) studied this question.
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