STUDIES　ON　THE　REACTIVITY　OF　CYCLOAROMATIZATION　REACTION　VIA　a－OXO　KETENE　DITHIOACETALS  

作　　者：Qun LIU Zhi Ling WANG Shu Jia ZHANG Zhi Yun YANG(Department of Chemistry, Northeast Normal University, Changchun, 130024) 

出　　处：《Chinese Chemical Letters》1994年第7期577-580,共4页中国化学快报（英文版）

摘　　要：The dihydric dithioketenes 3a-c obtained by 1,2-addition of methallyl Grignard reagent to bis(alkylthio)methylidene derivative ofdimedone 2a-c wewr converted to the cycloaromatization product 4 assisted by boron trifluoride etherate.When this reaction was performed in methanol,the substitution-cycloaroatization product 5 was obtained as by- product from 3c.To this eycloaromatization reaction,,the reactivity order dimethylthio>1, 3 - propylenedithio>1, 2- ethylenedithio carbon cation was established by the yields from 3a-c 4.An intramolecular a1,a1reaction pattern was developed by experiment.The dihydric dithioketenes 3a-c obtained by 1,2-addition of methallyl Grignard reagent to bis(alkylthio)methylidene derivative ofdimedone 2a-c wewr converted to the cycloaromatization product 4 assisted by boron trifluoride etherate.When this reaction was performed in methanol,the substitution-cycloaroatization product 5 was obtained as by- product from 3c.To this eycloaromatization reaction,,the reactivity order dimethylthio>1, 3 - propylenedithio>1, 2- ethylenedithio carbon cation was established by the yields from 3a-c 4.An intramolecular a1,a1reaction pattern was developed by experiment.

关 键 词：OXO KETENE REACTION CYCLOAROMATIZATION DITHIOACETALS VIA 

分 类 号：O621.25[理学—有机化学]