The organometallic intermediate (3) can be used to prepare iodo-allenes, and allenic and β-acetylenic ketones as well as ethers; the site of the reaction of an electrophile on the organometallic intermediate seems to depend on the hard or soft nature of the reagent according to Pearson's theory.
J. Dollat, J. Luche and P. Crabbé, J. Chem. Soc., Chem. Commun., 1977, 761 DOI: 10.1039/C39770000761
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