Ru(II)-functionalized SBA-15 as highly chemoselective, acid free and sustainable heterogeneous catalyst for acetalization of aldehydes and ketones

摘要

AbstractCombining electron deficient Ru(II) coordination sites with organofunctionalized SBA-15, (L)Ru(II)@SBA-15, result in a mild, neutral, water scavenger free and chemo-selective acetalization catalyst for cyclic/acyclic acetals. Vacant coordination sites of ruthenium in (L)Ru(II)@SBA-15 activates protecting groups as well as reactants simultaneously and restricts the reverse acetalization reaction. Synthesized (L)Ru(II)@SBA-15 catalyst has been thoroughly characterized and act as competitive catalyst compared to conventional acid catalysts. (L)Ru(II)@SBA-15 performs high catalytic activity as well as selectivity within 20min with high TOF. The catalyst can be recycled and reaction parameters are optimized.Graphical abstractDisplay OmittedHighlights?A grafted catalyst for acetalization reactions compared to conventional acid catalysts?Merging effect of electron deficient Ru(II) sites with organofunctionalized SBA-15?A mild, acid free and chemo-selective acetalization catalyst for cyclic/acyclic acetals?Exhibit high catalytic activity as well as selectivity within 20min with high TOF?The catalyst can be recycled and reaction parameters are optimized.]]>