Synthesis Of Iodine Catalyst Supported By Inorganic Ligands And Its Role In The Synthesis Of Carbonyl Compounds

In the field of catalytic oxidation conversion,organic iodine catalysts were a large component.At present,the research on catalysts for super-valent iodine was mostly IBX,DMP,etc.containing organic ligands.Generally,in this catalytic system,the organic ligand attached to iodine not only accelerated the reaction,but also precisely controled the catalysis.The selectivity of the reaction.However,many organic ligands still required the use of organic ligands or strong oxidizing agents such as tetraphenylphosphide?TPPP?.The presence of these organic substances not only greatly increased the cost,but also was sensitive to air and humidity.Derivability,sensitivity of organic ligands to oxidative self-degradation,durability of organic catalysts,and recyclability were still a major challenge.Here,we studied and synthesized an inorganic ligand-supported iodine catalyst?NH₄?₅[IMo₆O₂₄],and applied it to the catalytic oxidation of this catalyst to prepare carbonyl compounds.The catalyst has high selectivity,excellent stability and reusability,so it can be used as a potential green substitute for classical conversion.?1?Based on the preparation method of B-type Anderson heteropoly acid,this paper proposes a synthesis method of A-type Anderson heteropoly acid catalyst?NH₄?₅[IMo₆O₂₄]with central hetero atom as supervalent iodine.It was characterized by IR,XRD and UV.?2?This Anderson-type iodine catalyst?NH₄?₅[IMo₆O₂₄]was used in the catalytic oxidation reaction of benzyl chloride.The reaction conditions were optimized by reacting benzyl chloride as a template.While expanding the substrate,it was further confirmed that the catalyst?NH₄?₅[IMo₆O₂₄]has good catalytic activity and can oxidize the organic halide into the corresponding carbonyl compound in one step,and the yield is above 85%.?3?The synthesized inorganic iodine catalyst?NH₄?₅[IMo₆O₂₄]was applied to the catalytic oxidation reaction of alcohol.Using piperonyl alcohol as a template,it was found that NaCl was used as an additive and O₂ was the sole oxidant.The reaction was carried out at70 ^oC for 12 h,and the yield of piperonal was 95%.Taking piperitol as template material,the effects of the composition and amount of catalyst,oxidant,additive,solvent,etc.,reaction time and temperature on the oxidation of alcohol to aldehyde or ketone were investigated.Finally,the alcohol was oxidized to form the corresponding carbonyl compound.There are high yields.The study also found that by changing the different additives,the alcohol compound can selectively control the oxidation process in the stage of generating the corresponding aldehyde.