3,4-Dichlorocyclobut-3-ene-1,2-dione (squaric acid chloride) reacts with allylsilanes and silyl enol ethers in the presence of TiCl4 at C-1 and/or C-4, depending on the substitution pattern of the organosilane.
M. Ohno, Y. Yamamoto and S. Eguchi, J. Chem. Soc., Perkin Trans. 1, 1991, 2272 DOI: 10.1039/P19910002272
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