Sequential treatment of trithio- and triseleno-orthoesters with a Lewis acid followed by a base leads to ketene dithio- and diseleno-acetals in good yield; SnCl4 or TiCl4 and Pri2EtN or Et3N are the most efficient reagents.
K. M. Nsunda and L. Hevesi, J. Chem. Soc., Chem. Commun., 1985, 1000 DOI: 10.1039/C39850001000
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