Iron carbonyl complexes prepared in situ using the Fe(CO)5/NaH/MeI reagent combination and alkynes at 25 °C give the corresponding cyclobutenediones in 50-65% yields after CuCl2 · 2H2O oxidation.
Bibliographical noteFunding Information:
We are thankful to the CSIR (New Delhi) for financial support. Support of the UGC under “University of Potential for Excellence” programme is gratefully acknowledged. The award of the JC Bose Fellowship grant to M.P. gratefully acknowledged.
- Iron pentacarbonyl
- Sodium hydride