Treatment of α-lithiosulphones with copper(I) iodide in tetrahydrofuran followed by 1 mol. equiv. of an alkyl-lithium or Grignard reagent produces mixed homocuprates [R′SO2CH2CuR]– M+(M = Li or MgX) which are effective reagents for the conjugate addition of R to enones and substitution of chloride in acid chlorides to produce ketones (>90% yields).
C. R. Johnson and D. S. Dhanoa, J. Chem. Soc., Chem. Commun., 1982, 358 DOI: 10.1039/C39820000358
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