A vicinal ethylene bridged S/B frustrated Lewis pair (FLP) in situ generated by a hydroboration reaction of phenyl vinyl sulfide, reacts with p-tert-butylphenylacetylene by ethene/alkyne exchange and subsequent 1,2-addition of a second alkyne equivalent to give a zwitterionic sulfonium/borate product.
C. Eller, K. Bussmann, G. Kehr, B. Wibbeling, C. G. Daniliuc and G. Erker, Chem. Commun., 2014, 50, 1980 DOI: 10.1039/C3CC47769J
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