周浩,卓广澜,姜玄珍.环钯-[PPh4]Br体系催化氯代芳烃的Heck芳基化反应研究[J].分子催化,2005,(6):490-494 |
环钯-[PPh4]Br体系催化氯代芳烃的Heck芳基化反应研究 |
Study on the Heck Reaction of Chlorobenzene Catalyzed by Palladacycle-[ PPh4 ] Br |
投稿时间:2005-04-12 修订日期:2005-06-15 |
DOI: |
中文关键词: 环钯 Heck反应 氯苯 助催化剂 |
英文关键词:Palladacycles Heck reaction Chlorobenzene Co-catalyst |
基金项目:中国科学院资助项目 |
周浩 卓广澜 姜玄珍 |
浙江大学化学系,浙江杭州310027 |
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中文摘要: |
以氯代芳烃为底物,季鏻盐[PPh4]Br为助催化剂,用于环钯催化的Heek芳基化反应.结果表明,在环钯-[PPh4]Br催化体系中,以Na2CO3作为碱性试剂,使用0.3mol%Pd的环钯催化剂催化氯苯的Heek反应,就可得到比较高的产率(88%)和转化率(90%).对于大部分卤代芳烃Heck反应而言,环钯-[PPh4]Br是一种有效的催化体系,即使是对含推电子基团的不活泼的氯代芳烃,在此体系中也能获得比较好的结果.此外,文中还探讨了反应温度、[PPh4]Br/Pd比值及催化剂回用对反应活性的影响. |
英文摘要: |
In this study,it was describedthat a phosphonium salt,\Br,was used as co-catalyst in the palladacycle catalyst system for the Heck reactionof the aryl chlorides.Inthe Palladacycle-\Br catalyst system,the amount of 0.3 mol % palladium can afford high yield(88%) and conversion(90%) for the Heck reaction of chlorobenzene with styrenebyusing Na_(2)CO_(3)as the base.Palladacycle-\Bris an efficientcatalyst system for the most aryl halides,even some aryl chlorides with electron-donating groups.Moreover,the influences of reaction temperature,the ratio of \Br/Pdand recycling of catalyst on the reaction performances were also discussed. |
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