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以乙烯基二胺为连接臂将四甲基哌啶氮氧化物(TEMPO)负载于β-环糊精(β-CD)上,得到负载型催化剂β-CD-TEMPO.采用~1H NMR、~(13)C NMR以及FT-IR等手段对β-CD-TEMPO进行了表征.将β-CD-TEMPO、CuBr_2以及K_2CO_3结合构成催化体系,用于分子氧为氧化剂的醇的选择性氧化反应,结果表明该体系对苄基以及烯丙基伯醇的氧化显示出良好的催化活性和选择性.在负载催化剂中,乙烯基二胺既作为连接臂又作为配体与铜离子配位,使氧化反应顺利进行.负载型催化剂β-CD-TEMPO与产物容易分离,能够循环使用.
Tetramethylpiperidine oxynitride (TEMPO) was loaded on β-cyclodextrin (β-CD) with vinyldiamine as the linker to obtain the supported catalyst β-CD-TEMPO. (13) C-NMR and FT-IR were used to characterize the β-CD-TEMPO.β-CD-TEMPO, CuBr_2 and K_2CO_3 were combined to form a catalytic system for the selective oxidation of alcohols with molecular oxygen as oxidant, The results showed that the system showed good catalytic activity and selectivity for the oxidation of benzyl and allyl primary alcohols.In the supported catalysts, the vinyl diamine coordinated both as a linker and as a ligand to the copper ion to oxidize The reaction proceeds smoothly.The supported catalyst β-CD-TEMPO is easily separated from the product and can be recycled.