Reactive iron carbonyl species via reduction of FeCl3 with NaBH4 in the presence of CO: Conversion of 1-alkynes to benzoquinones and cyclobutenediones

摘要

Iron carbonyl species, prepared in situ at 25 degrees C through reduction of anhydrous FeCl3 with NaBH4 in the presence of carbon monoxide and acetic acid in THF, reacts with 1-alkynes at reflux temperature to give: the corresponding benzoquinones after CuCl2. 2H(2)O oxidation in moderate to good yields (51-80%). Also, these species upon CH3I treatment followed by reaction with 1-alkynes lead to the formation of the corresponding cyclobutenediones in moderate yields (30-37%) after CuCl(2 .)2H(2)O oxidation. [References: 29]