金属卟啉/MgAl水滑石催化醇选择性氧化制备羰基化合物

将MgAl水滑石引入到金属四苯基卟啉(MTPPs,M=Co,Fe,Mn,Ni)催化氧化体系中,实现了醇的选择性氧化。 结果表明,在分子氧/异丁醛体系中,CoTPP在苯甲醇氧化制苯甲醛反应中表现出优异的催化活性,MgAl水滑石添加剂可有效地提高醛的选择性。 在苯甲醇1 mmol、乙腈2 mL、CoTPP 5 mg、MgAl水滑石18 mg、异丁醛5 mmol、反应温度60 ℃、氧气气氛下反应2 h,苯甲醇的转化率和苯甲醛的选择性分别达到94%和92%。 另外,此催化体系在其它醇类化合物的氧化反应中也具有较好催化活性。

Selective Oxidation of Alcohols to Carbonyl Compounds over Metalloporphyrins with MgAl Hydrotalcite Additive

The selective aerobic oxidation of alcohols to carbonyl compounds was achieved by introduction of MgAl hydrotalcite into the metallotetraphenylporphyrins(MTPPs, M=Co, Fe, Mn, Ni) catalytic oxidation system. The results indicated that CoTPP exhibited the highest catalytic activity in the oxidation of benzyl alcohol to benzaldehyde through molecular oxygen/isobutyraldehyde(IBA) system, and MgAl hydrotalcite additive could effectively improve the catalytic selectivity of aldehyde. Under the optimized conditions(benzyl alcohol 1 mmol, acetonitrile 2 mL, CoTPP 5 mg, MgAl hydrotalcite 18 mg, IBA 5 mmol, reaction temperature 60 ℃, oxygen atmosphere, reaction time 2 h), the conversion of benzyl alcohol and the selectivity of benzaldehyde reached 94% and 92%, respectively. The catalytic system also exhibited good catalytic performance in the oxidation of other benzylic alcohols.