Friedel-Crafts alkylation of pyrene in carbon disulfide; 1H NMR spectroscopy of pyrene derivatives
作者:L. Rodenburg、R. de Block、C. Erkelens、J. Lugtenburg、J. Cornelisse
DOI:10.1002/recl.19881070903
日期:——
Friedel-Crafts alkylation of pyrene with 2,5-dichloro-2,5-dimethylhexane and 2,4-dichloro-2,4-dimethylpentane in carbon disulfide yields 7,7,10,10-tetramethyl-7,8,9,10-tetrahydrobenzo[a]pyrene and 7J,9,9-tetramethyl-8,9-dihydro-7H-cyclopenta[a]pyrene, respectively, both in 99% yield. Alkylation with 1,4-dichlorobutane, followed by aromatization, yields benzo[a]pyrene in a facile two-step synthesis
在二硫化碳中用2,5-二氯-2,5-二甲基己烷和2,4-二氯-2,4-二甲基戊烷进行pyr的Friedel-Crafts烷基化反应,得到7,7,10,10-四甲基-7,8,9, 10-四氢苯并[ a ] py和7J,9,9-四甲基-8,9-二氢-7 H-环戊[ a ] py的产率均为99%。用1,4-二氯丁烷进行烷基化,然后进行芳构化,可在两步合成中以8%的收率得到苯并[ a ] py。提出了一种机制,该机制合理化了仅一个undergo环进行取代的事实。讨论了derivatives衍生物的1 H- 1 H NMR偶联常数。