The Synthesis of Sn-Containing Silicates Coated with Binaphthol and Their Specific Application for Catalytic Synthesis of 6-Hydroxyhexanoic Acid and Cyclohexylformate through Baeyer-Villiger Oxidation

The Baeyer–Villiger oxidation (BVO) of ketone and aldehyde can produce ester formate, which both have wide applications in many areas. In this work, a series Sn-containing silicates were prepared through the sol-gel process by using structure-directing crystallizing agents post-synthetic coordinated modification binaphthol. Characterizations revealed that loading (L)-sodium lactate as agent decreased crystal size synthesized catalyst, there SnO2 nanoparticles with sizes 17–19 nm on catalyst. Furthermore, quite differently from 3D mesoporous structure classical Sn-beta zeolites, catalysts had silt-like structure. catalysis, when cyclic aliphatic ketones used substrate, only BVO-type products corresponding ring-opening obtained. BVO produced an aerobic product (carboxylic acid) product. presented transformation aromatic (benzaldehyde) gave (benzoic acid). coordinating attachment (S)-binaphthol to silicate backbone worsened but improved aldehyde. addition, work also developed two new routes for synthesis high-value-added 6-hydroxyhexanoic acid cyclohexylformate under catalytic conditions.