Direct Carbonylation of Benzyl Alcohol and Its Analogs Catalyzed by Palladium and HI in Aqueous Systems and Mechanistic Studies
作者:Yong-Shou Lin、Akio Yamamoto
DOI:10.1246/bcsj.71.723
日期:1998.3
4-benzenediacetic acid, and o-hydroxybenzeneacetic acid. A mechanism for the catalytic reaction is proposed, which involves (1) formation of benzyl iodide by the reaction of benzyl alcohol with HI in situ, (2) oxidative addition of benzyl iodide to palladium(0) to form a benzylpalladium iodide species, (3) CO insertion into the Pd-benzyl bond to form a (phenylacetyl)palladium iodide species, (4) reductive elimination
由钯配合物催化并由碘化氢促进的苯甲醇、甲酸苄酯、二苄基醚和苯乙酸苄酯的羰基化反应在水性体系中以中等至优异的产率得到苯乙酸。将羰基化过程应用于其他芳基甲醇类似物为制备 2-萘乙酸、3-异色满酮、1,4-苯二乙酸和邻羟基苯乙酸提供了方便的方法。提出了催化反应的机制,包括(1)通过苯甲醇与 HI 原位反应形成苄基碘,(2)苄基碘与钯(0)的氧化加成形成苄基碘化钯物种,( 3) CO插入Pd-苄基键形成(苯乙酰)碘化钯物质,(4)苯乙酰碘的还原消除,(5)水解为苯乙酸。通过检查苄基和(苯乙酰基)碘化钯和氯化物配合物的性质,获得了支持该机制的证据。